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I_kwDODunzps7YxUwe
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Why does dataset merge fail when tools have different parameters?
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Hi, I have a question about SFT (Supervised Fine-tuning) for an agent model.
Suppose I want to fine-tune an agent model that may receive two different tools: tool1 and tool2. These tools have different parameters and types in their schema definitions.
When I try to merge datasets containing different tool definitions, I get the following error:
TypeError: Couldn't cast array of type
struct<refundFee: struct<description: string, type: string>, ... , servicerId: struct<description: string, type: string>>
to
{
'refundFee': {'description': Value(dtype='string'), 'type': Value(dtype='string')},
...
'templateId': {'description': Value(dtype='string'), 'type': Value(dtype='string')}
}
From my understanding, the merge fails because the tools column's nested structure is different across datasets — e.g., one struct contains an extra field servicerId while the other does not. This causes HuggingFace Datasets (and its underlying Apache Arrow schema) to reject the merge.
My question is: why is it designed this way?
Is this strict schema matching a hard requirement of the library?
Is there a recommended way to merge datasets with different tool schemas (different parameters and types)?
For an agent model supporting multiple tools, what's the best practice for preparing/merging training data without losing flexibility?
Any guidance or design rationale would be greatly appreciated. Thanks!
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I_kwDODunzps7Ygnj8
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Data duplication with `split_dataset_by_node` and `interleaved_dataset`
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### Describe the bug
Data duplication in different rank, when process a iterabledataset with first `split_dataset_by_node` and then `interleaved_dataset`
### Steps to reproduce the bug
I have provide a minimum scripts
```python
import os
from datasets import interleave_datasets, load_dataset
from datasets.distributed import split_dataset_by_node
path = "/mnt/wwx/datasets/fineweb/data/CC-MAIN-2013-20/"
files = [os.path.join(path, fn) for fn in os.listdir(path)]
dataset = load_dataset("parquet", split="train", data_files=files, streaming=True)
print(f"{dataset.n_shards=}")
dataset_rank0 = split_dataset_by_node(dataset, 0, 4)
dataset_rank1 = split_dataset_by_node(dataset, 1, 4)
dataset_rank0_interleaved = interleave_datasets([dataset_rank0], seed=42, probabilities=[1.0])
dataset_rank1_interleaved = interleave_datasets([dataset_rank1], seed=42, probabilities=[1.0])
print("print the first sample id from all datasets")
print("dataset", next(iter(dataset))['id'])
print("dataset_rank0", next(iter(dataset_rank0))['id'])
print("dataset_rank1", next(iter(dataset_rank1))['id'])
print("dataset_rank0_interleaved", next(iter(dataset_rank0_interleaved))['id'])
print("dataset_rank1_interleaved", next(iter(dataset_rank1_interleaved))['id'])
dataset_rank0_shard = dataset.shard(4, 0)
dataset_rank1_shard = dataset.shard(4, 1)
dataset_rank0_shard_interleaved = interleave_datasets([dataset_rank0_shard], seed=42, probabilities=[1.0])
dataset_rank1_shard_interleaved = interleave_datasets([dataset_rank1_shard], seed=42, probabilities=[1.0])
print("dataset_rank0_shard", next(iter(dataset_rank0_shard))['id'])
print("dataset_rank1_shard", next(iter(dataset_rank1_shard))['id'])
print("dataset_rank0_shard_interleaved", next(iter(dataset_rank0_shard_interleaved))['id'])
print("dataset_rank1_shard_interleaved", next(iter(dataset_rank1_shard_interleaved))['id'])
```
I just use a subfold of C4 with 14 paruets to do the quick run and get
```
dataset.n_shards=14
print the first sample id from all datasets
dataset <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank0 <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank1 <urn:uuid:6b7da64f-c26e-4086-aef5-4b6f01106223>
dataset_rank0_interleaved <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank1_interleaved <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank0_shard <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank1_shard <urn:uuid:67cf7216-dd05-4f55-a28a-1a1c96989c51>
dataset_rank0_shard_interleaved <urn:uuid:c84a7f00-f3e8-4b67-baa4-df5adaf23bae>
dataset_rank1_shard_interleaved <urn:uuid:67cf7216-dd05-4f55-a28a-1a1c96989c51>
```
### Expected behavior
the first sample of `dataset_rank0_interleaved` and `dataset_rank1_interleaved` should be different, as other `rank0` `rank1` couples.
I have dive into the function and try to find how it work in `split -> interleaved` process.
the `split_dataset_by_node` of iterable dataset does't not change `._ex_iterable` attribute of the dataset. it just set the distributed config in dataset, and the distributed dataset is used in actually `__iter__` call, to handle with shard split or sample skipping.
however, in `interleaved_dataset` of iterable dataset. it copy out all of the `._ex_iterable` of provided datasets, and consist a new `_ex_iterable`, so the missing copy of `distributed config` caused the data duplication in different dp rank.
So I may first ask, is it an unexpected using order of those function, which means:
- always do `split_dataset_by_node` at final rather than in middle way.
- or use `dataset.shard(dp_size, dp_rank)` rather than `split_dataset_by_node` in case similar of mine.
if the using order is permiited, I think it is a bug, and I can do a PR to fix it
(I meet this bug in real training, related issue is https://github.com/ByteDance-Seed/VeOmni/issues/200 if it helps.
### Environment info
datasets 4.4.1
ubuntu 20.04
python 3.11.4
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I_kwDODunzps7X0wiK
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NonMatchingSplitsSizesError when loading partial dataset files
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### Describe the bug
When loading only a subset of dataset files while the dataset's README.md contains split metadata, the system throws a NonMatchingSplitsSizesError . This prevents users from loading partial datasets for quick validation in cases of poor network conditions or very large datasets.
### Steps to reproduce the bug
1. Use the Hugging Face `datasets` library to load a dataset with only specific files specified
2. Ensure the dataset repository has split metadata defined in README.md
3. Observe the error when attempting to load a subset of files
```python
# Example code that triggers the error
from datasets import load_dataset
book_corpus_ds = load_dataset(
"SaylorTwift/the_pile_books3_minus_gutenberg",
name="default",
data_files="data/train-00000-of-00213-312fd8d7a3c58a63.parquet",
split="train",
cache_dir="./data"
)
```
### Error Message
```
Traceback (most recent call last):
File "/Users/QingGo/code/llm_learn/src/data/clean_cc_bc.py", line 13, in <module>
book_corpus_ds = load_dataset(
"SaylorTwift/the_pile_books3_minus_gutenberg",
...
File "/Users/QingGo/code/llm_learn/.venv/lib/python3.13/site-packages/datasets/utils/info_utils.py", line 77, in verify_splits
raise NonMatchingSplitsSizesError(str(bad_splits))
datasets.exceptions.NonMatchingSplitsSizesError: [{'expected': SplitInfo(name='train', num_bytes=106199627990.47722, num_examples=192661, shard_lengths=None, dataset_name=None), 'recorded': SplitInfo(name='train', num_bytes=454897326, num_examples=905, shard_lengths=None, dataset_name='the_pile_books3_minus_gutenberg')}]
```
### Expected behavior
When loading partial dataset files, the system should:
1. Skip the `NonMatchingSplitsSizesError` validation, OR
2. Only log a warning message instead of raising an error
### Environment info
- `datasets` version: 4.3.0
- Platform: macOS-15.7.1-arm64-arm-64bit-Mach-O
- Python version: 3.13.2
- `huggingface_hub` version: 0.36.0
- PyArrow version: 22.0.0
- Pandas version: 2.3.3
- `fsspec` version: 2025.9.0
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docs: add Python version requirement note to installation section
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Added note about Python version requirement for conda installation.
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[FEAT] MIDI feature support
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This PR adds a new `Midi` feature for reading and importing MIDI files into the datasets.
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add_column and add_item erroneously(?) require new_fingerprint parameter
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2025-11-13 02:57:12+00:00
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### Describe the bug
Contradicting their documentation (which doesn't mention the parameter at all), both Dataset.add_column and Dataset.add_item require a new_fingerprint string. This parameter is passed directly to the dataset constructor, which has the fingerprint parameter listed as optional; is there any reason it shouldn't be optional in these methods as well?
### Steps to reproduce the bug
Reproduction steps:
1. Look at the function signature for add_column: https://github.com/huggingface/datasets/blob/17f40a318a1f8c7d33c2a4dd17934f81d14a7f57/src/datasets/arrow_dataset.py#L6078
2. Repeat for add_item: https://github.com/huggingface/datasets/blob/17f40a318a1f8c7d33c2a4dd17934f81d14a7f57/src/datasets/arrow_dataset.py#L6336
### Expected behavior
add_column and add_item should either set the fingerprint parameter to optional or include it in their docstrings
### Environment info
Not environment-dependent
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| 7,863
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Support hosting lance / vortex / iceberg / zarr datasets on huggingface hub
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2025-11-13 00:51:07+00:00
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2025-11-17 21:37:11+00:00
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### Feature request
Huggingface datasets has great support for large tabular datasets in parquet with large partitions. I would love to see two things in the future:
- equivalent support for `lance`, `vortex`, `iceberg`, `zarr` (in that order) in a way that I can stream them using the datasets library
- more fine-grained control of streaming, so that I can stream at the partition / shard level
### Motivation
I work with very large `lance` datasets on S3 and often require random access for AI/ML applications like multi-node training. I was able to achieve high throughput dataloading on a lance dataset with ~150B rows by building distributed dataloaders that can be scaled both vertically (until i/o and CPU are saturated), and then horizontally (to workaround network bottlenecks).
Using this strategy I was able to achieve 10-20x the throughput of the streaming data loader from the `huggingface/datasets` library.
I realized that these would be great features for huggingface to support natively
### Your contribution
I'm not ready yet to make a PR but open to it with the right pointers!
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Add flatten_indices option to save_to_disk method
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CONTRIBUTOR
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Added flatten_indices parameter to control index flattening during dataset saving.
Solves #7861
This PR introduces a new optional argument, flatten_indices, to the save_to_disk methods in both Dataset and DatasetDict.
The change allows users to skip the expensive index-flattening step when saving datasets that already use index mappings (e.g., after filter() or shuffle()), resulting in significant speed improvements for large datasets while maintaining backward compatibility.
While not a huge absolute difference at 100K rows, the improvement scales significantly with larger datasets (millions of rows).
This patch gives users control — they can disable flattening when they don’t need it, avoiding unnecessary rewrites.
@lhoestq WDYT?
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Performance Issue: save_to_disk() 200-1200% slower due to unconditional flatten_indices()
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## 🐛 Bug Description
The `save_to_disk()` method unconditionally calls `flatten_indices()` when `_indices` is not None, causing severe performance degradation for datasets processed with filtering, shuffling, or multiprocessed mapping operations.
**Root cause**: This line rebuilds the entire dataset unnecessarily:
```python
dataset = self.flatten_indices() if self._indices is not None else self
```
## 📊 Performance Impact
| Dataset Size | Operation | Save Time | Slowdown |
|-------------|-----------|-----------|----------|
| 100K | Baseline (no indices) | 0.027s | - |
| 100K | Filtered (with indices) | 0.146s | **+431%** |
| 100K | Shuffled (with indices) | 0.332s | **+1107%** |
| 250K | Shuffled (with indices) | 0.849s | **+1202%** |
## 🔄 Reproduction
```python
from datasets import Dataset
import time
# Create dataset
dataset = Dataset.from_dict({'text': [f'sample {i}' for i in range(100000)]})
# Baseline save (no indices)
start = time.time()
dataset.save_to_disk('baseline')
baseline_time = time.time() - start
# Filtered save (creates indices)
filtered = dataset.filter(lambda x: True)
start = time.time()
filtered.save_to_disk('filtered')
filtered_time = time.time() - start
print(f"Baseline: {baseline_time:.3f}s")
print(f"Filtered: {filtered_time:.3f}s")
print(f"Slowdown: {(filtered_time/baseline_time-1)*100:.1f}%")
```
**Expected output**: Filtered dataset is 400-1000% slower than baseline
## 💡 Proposed Solution
Add optional parameter to control flattening:
```python
def save_to_disk(self, dataset_path, flatten_indices=True):
dataset = self.flatten_indices() if (self._indices is not None and flatten_indices) else self
# ... rest of save logic
```
**Benefits**:
- ✅ Immediate performance improvement for users who don't need flattening
- ✅ Backwards compatible (default behavior unchanged)
- ✅ Simple implementation
## 🌍 Environment
- **datasets version**: 2.x
- **Python**: 3.10+
- **OS**: Linux/macOS/Windows
## 📈 Impact
This affects **most ML preprocessing workflows** that filter/shuffle datasets before saving. Performance degradation scales exponentially with dataset size, making it a critical bottleneck for production systems.
## 🔗 Additional Resources
We have comprehensive test scripts demonstrating this across multiple scenarios if needed for further investigation.
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|
Support loading local arrow datasets via load_dataset
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2025-11-11 04:58:33+00:00
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2025-11-11 20:58:46+00:00
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Load_dataset will handle local saved datasets that way
#7018
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fix some broken links
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MEMBER
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would be cool to automate finding those broken links as i think there might be many of them @lhoestq @albertvillanova
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Support downloading specific splits in `load_dataset`
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2025-11-09 20:44:00+00:00
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2025-11-11 08:04:14+00:00
|
NaT
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CONTRIBUTOR
| null | null | null | null |
This is PR builds on top of #7706 to revive the unfinished #6832 but isn't just cleaning up things, here are some important changes:
- `download_mode="FORCE_REDOWNLOAD"` is interpreted as always creating a clean slate, that means that even if we already did:
```python
load_dataset("<name>")
load_dataset("<name>", split="train", download_mode="force_redownload")
```
This makes sure that only the train dataset is available after executing both. This was different in the original PR, which proposed that train and test would be available.
- `download_mode="REUSE_DATASET_IF_EXISTS"` is interpreted as only ever adding new data, never redownloading OR deleting other splits. This was different in the original PR, where
```python
load_dataset("<name>", split="test")
load_dataset("<name>", split="train")
```
resulted in only the train data being available, which I deem very unintuitive and probably not what users want. Also I argue that this is just the first step to a more user friendly partial loading when specifying percentages (or maybe even single instances) via the ReadInstructions, and then doing
```python
load_dataset("<name>", split="test[:10%]")
load_dataset("<name>", split="test[10%:]")
```
should result IMO in the whole dataset being cached locally without redownloads.
Furthermore this PR fixes a couple issues with the previous PR, e.g. a [missing comparison](https://github.com/huggingface/datasets/pull/7706/files#diff-f933ce41f71c6c0d1ce658e27de62cbe0b45d777e9e68056dd012ac3eb9324f7R877) and adding tests for the proposed changes in behaviour, which would both fail on @ArjunJagdale's original PR.
Todo:
- [ ] update docs?
Future outlook (just my opinions and up for debate):
As mentioned before, I would see this as just a step towards the feature of partial percentage loading (though how the API should behave in that case is not entirely clear for me now) and maybe we could introduce another `download_mode="FORCE_REDOWNLOAD_SPLIT"`, which makes sure that even if a split is specified, only the referenced split is redownloaded and everything else left unchanged, this would then allow users more granular control over what they want to redownload.
@lhoestq very curious to get your opinion on this.
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| 3,603,729,142
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I_kwDODunzps7WzIr2
| 7,856
|
Missing transcript column when loading a local dataset with "audiofolder"
|
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2025-11-08 16:27:58+00:00
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2025-11-09 12:13:38+00:00
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2025-11-09 12:13:38+00:00
|
NONE
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### Describe the bug
My local dataset is not properly loaded when using `load_dataset("audiofolder", data_dir="my_dataset")` with a `jsonl` metadata file.
Only the `audio` column is read while the `transcript` column is not.
The last tested `datasets` version where the behavior was still correct is 2.18.0.
### Steps to reproduce the bug
Dataset directory structure:
```
my_dataset/
- data/
- test/
- 54db8760de3cfbff3c8a36a36b4d0f77_00390.0_04583.0.mp3
- 54db8760de3cfbff3c8a36a36b4d0f77_04583.0_05730.0.mp3
- ...
- metadata.jsonl
```
`metadata.jsonl` file content:
```
{"file_name": "data/test/54db8760de3cfbff3c8a36a36b4d0f77_00390.0_04583.0.mp3", "transcript": "Ata tudoù penaos e tro ar bed ?"}
{"file_name": "data/test/54db8760de3cfbff3c8a36a36b4d0f77_04583.0_05730.0.mp3", "transcript": "Ur gwir blijadur eo adkavout ac'hanoc'h hiziv."}
...
```
```python3
my_dataset = load_dataset("audiofolder", data_dir="my_dataset")
print(my_dataset)
'''
DatasetDict({
test: Dataset({
features: ['audio'],
num_rows: 347
})
})
'''
print(my_dataset['test'][0])
'''
{'audio': <datasets.features._torchcodec.AudioDecoder object at 0x75ffcd172510>}
'''
```
### Expected behavior
Being able to access the `transcript` column in the loaded dataset.
### Environment info
- `datasets` version: 4.4.1
- Platform: Linux-6.5.0-45-generic-x86_64-with-glibc2.39
- Python version: 3.13.9
- `huggingface_hub` version: 1.1.2
- PyArrow version: 22.0.0
- Pandas version: 2.3.3
- `fsspec` version: 2025.10.0
Note: same issue with `datasets` v3.6.0
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PR_kwDODunzps6yPIRy
| 7,855
|
ArXiv -> HF Papers
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2025-11-07 22:16:36+00:00
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MEMBER
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PR_kwDODunzps6x8yiy
| 7,854
|
[Distributed] split_dataset_by_node() gives the same number of examples for each node
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2025-11-06 17:14:18+00:00
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2025-11-10 14:57:44+00:00
|
NaT
|
MEMBER
| null | null | null | null |
this works:
```python
import torch.distributed as dist
from datasets import IterableDataset
from datasets.distributed import split_dataset_by_node
from collections import Counter
def g(shards):
for shard in shards:
# shards don't have the same length
num_examples = 3 + shard
for i in range(num_examples):
yield {"shard": f"{shard=}", "i": i}
if __name__ == "__main__":
dist.init_process_group(backend="gloo")
rank, world_size = dist.get_rank(), dist.get_world_size()
num_shards = 6
ds = IterableDataset.from_generator(g, gen_kwargs={"shards": list(range(num_shards))})
ds = split_dataset_by_node(ds, rank=rank, world_size=world_size)
# Check that each rank has the same number of examples
# and show the number of examples per shard and per rank
counter = Counter(ds["shard"])
print(f"# {rank=}\ttotal={counter.total()}\t{counter}", flush=True)
# torchrun --nproc_per_node 2 script.py
# rank=0 total=16 Counter({'shard=4': 7, 'shard=2': 5, 'shard=0': 4})
# rank=1 total=16 Counter({'shard=3': 6, 'shard=5': 6, 'shard=1': 4})
```
TODO: make it work with DataLoader (communicate with main process to know when the node runs out of data ?)
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Fix embed storage nifti
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2025-11-06 15:07:58+00:00
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2025-11-06 17:04:57+00:00
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2025-11-06 16:20:36+00:00
|
CONTRIBUTOR
| null | null | null | null |
Fixes #7852
Adds `embed_storage` function and allows gzipped files to be loaded correctly from local storage.
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Problems with NifTI
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2025-11-06 11:46:33+00:00
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2025-11-06 16:20:38+00:00
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2025-11-06 16:20:38+00:00
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CONTRIBUTOR
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### Describe the bug
There are currently 2 problems with the new NifTI feature:
1. dealing with zipped files, this is mentioned and explained [here](https://github.com/huggingface/datasets/pull/7815#issuecomment-3496199503)
2. when uploading via the `niftifolder` feature, the resulting parquet only contains relative paths to the nifti files:
```bash
table['nifti']
<pyarrow.lib.ChunkedArray object at 0x798245d37d60>
[
-- is_valid: all not null
-- child 0 type: binary
[
null,
null,
null,
null,
null,
null
]
-- child 1 type: string
[
"/home/tobias/programming/github/datasets/nifti_extracted/T1.nii",
"/home/tobias/programming/github/datasets/nifti_extracted/T2-interleaved.nii",
"/home/tobias/programming/github/datasets/nifti_extracted/T2.nii",
"/home/tobias/programming/github/datasets/nifti_extracted/T2_-interleaved.nii",
"/home/tobias/programming/github/datasets/nifti_extracted/T2_.nii",
"/home/tobias/programming/github/datasets/nifti_extracted/fieldmap.nii"
]
]
```
instead of containing bytes. The code is copy pasted from PDF, so I wonder what is going wrong here.
### Steps to reproduce the bug
see the linked comment
### Expected behavior
downloading should work as smoothly as for pdf
### Environment info
- `datasets` version: 4.4.2.dev0
- Platform: Linux-6.14.0-33-generic-x86_64-with-glibc2.39
- Python version: 3.12.3
- `huggingface_hub` version: 0.35.3
- PyArrow version: 21.0.0
- Pandas version: 2.3.3
- `fsspec` version: 2025.9.0
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PR_kwDODunzps6xtvVj
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Add fasta support
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2025-11-05 18:11:12+00:00
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2025-11-15 00:51:53+00:00
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NaT
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NONE
| null | null | null | null |
This PR adds support for FASTA files conversion to Parquet.
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2025-11-05 14:42:59+00:00
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2025-11-05 14:04:03+00:00
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CONTRIBUTOR
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closes #7841
As mentioned in the issue `mode` has been copy-pasted but isn't used in these files.
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Better streaming retries (504 and 429)
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fix column with transform
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fix https://github.com/huggingface/datasets/issues/7842
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|
Transform with columns parameter triggers on non-specified column access
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### Describe the bug
Iterating over a [`Column`](https://github.com/huggingface/datasets/blob/8b1bd4ec1cc9e9ce022f749abb6485ef984ae7c0/src/datasets/arrow_dataset.py#L633-L692) iterates through the parent [`Dataset`](https://github.com/huggingface/datasets/blob/8b1bd4ec1cc9e9ce022f749abb6485ef984ae7c0/src/datasets/arrow_dataset.py#L695) and applies all formatting/transforms on each row, regardless of which column is being accessed. This causes an error when transforms depend on columns not present in the projection.
### Steps to reproduce the bug
### Load a dataset with multiple columns
```python
ds = load_dataset("mrbrobot/isic-2024", split="train")
```
### Define a transform that specifies an input column
```python
def image_transform(batch):
batch["image"] = batch["image"] # KeyError when batch doesn't contain "image"
return batch
# apply transform only to image column
ds = ds.with_format("torch")
ds = ds.with_transform(image_transform, columns=["image"], output_all_columns=True)
```
### Iterate over non-specified column
```python
# iterate over a different column, triggers the transform on each row, but batch doesn't contain "image"
for t in ds["target"]: # KeyError: 'image'
print(t)
```
### Expected behavior
If a user iterates over `ds["target"]` and the transform specifies `columns=["image"]`, the transform should be skipped.
### Environment info
`datasets`: 4.2.0
Python: 3.12.12
Linux: Debian 11.11
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DOC: `mode` parameter on pdf and video features unused
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2025-11-02 12:37:47+00:00
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2025-11-05 14:04:04+00:00
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2025-11-05 14:04:04+00:00
|
CONTRIBUTOR
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Following up on https://github.com/huggingface/datasets/pull/7840 I asked claude code to check for undocumented parameters for other features and it found:
- mode parameter on video is documented but unused: https://github.com/huggingface/datasets/blob/main/src/datasets/features/video.py#L48-L49
- the same goes for the mode parameter on the pdf feature: https://github.com/huggingface/datasets/blob/main/src/datasets/features/pdf.py#L47-L48
I assume checking if these modes can be supported and otherwise removing them is the way to go here.
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https://github.com/huggingface/datasets/pull/7840
| 3,579,486,348
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PR_kwDODunzps6xDsbG
| 7,840
|
Add num channels to audio
|
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2025-11-02 12:10:24+00:00
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2025-11-03 17:37:48+00:00
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2025-11-03 14:24:11+00:00
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CONTRIBUTOR
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Fixes #7837
We currently have the [mono attribute for Audio documented](https://github.com/huggingface/datasets/blob/41c05299348a499807432ab476e1cdc4143c8772/src/datasets/features/audio.py#L52C1-L54C22) but not used anywhere resulting in confusion for users. Since torchcodec does not know this attribute I suggest using `num_channels` (currently supported `None` (leave unchanged), mono: `1`, stereo: `2`).
I could also add a mono attribute but found that to be more confusing for developers and would restrict us if at any point in the future more than 2 channels are supported.
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I_kwDODunzps7VVRCz
| 7,839
|
datasets doesn't work with python 3.14
|
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2025-11-02 09:09:06+00:00
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2025-11-04 14:02:25+00:00
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2025-11-04 14:02:25+00:00
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NONE
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### Describe the bug
Seems that `dataset` doesn't work with python==3.14. The root cause seems to be something with a `deel` API that was changed.
```
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
```
### Steps to reproduce the bug
(on a new folder)
uv init
uv python pin 3.14
uv add datasets
uv run python
(in REPL)
import datasets
datasets.load_dataset("cais/mmlu", "all") # will fail on any dataset
```
>>> datasets.load_dataset("cais/mmlu", "all")
Traceback (most recent call last):
File "<python-input-2>", line 1, in <module>
datasets.load_dataset("cais/mmlu", "all")
~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/load.py", line 1397, in load_dataset
builder_instance = load_dataset_builder(
path=path,
...<10 lines>...
**config_kwargs,
)
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/load.py", line 1185, in load_dataset_builder
builder_instance._use_legacy_cache_dir_if_possible(dataset_module)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/builder.py", line 615, in _use_legacy_cache_dir_if_possible
self._check_legacy_cache2(dataset_module) or self._check_legacy_cache() or None
~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/builder.py", line 487, in _check_legacy_cache2
config_id = self.config.name + "-" + Hasher.hash({"data_files": self.config.data_files})
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/fingerprint.py", line 188, in hash
return cls.hash_bytes(dumps(value))
~~~~~^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 120, in dumps
dump(obj, file)
~~~~^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 114, in dump
Pickler(file, recurse=True).dump(obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 428, in dump
StockPickler.dump(self, obj)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 498, in dump
self.save(obj)
~~~~~~~~~^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 70, in save
dill.Pickler.save(self, obj, save_persistent_id=save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 422, in save
StockPickler.save(self, obj, save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 572, in save
f(self, obj) # Call unbound method with explicit self
~^^^^^^^^^^^
File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 1262, in save_module_dict
StockPickler.save_dict(pickler, obj)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 1064, in save_dict
self._batch_setitems(obj.items(), obj)
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
```
### Expected behavior
should work.
### Environment info
datasets==v4.3.0
python==3.14
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I_kwDODunzps7VHRwG
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|
mono parameter to the Audio feature is missing
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2025-10-31 15:41:39+00:00
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2025-11-03 15:59:18+00:00
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2025-11-03 14:24:12+00:00
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NONE
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According to the docs, there is a "mono" parameter to the Audio feature, which turns any stereo into mono. In practice the signal is not touched and the mono parameter, even though documented, does not exist.
https://github.com/huggingface/datasets/blob/41c05299348a499807432ab476e1cdc4143c8772/src/datasets/features/audio.py#L52C1-L54C22
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PR_kwDODunzps6wLuh9
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Python 3.14
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2025-10-28 16:11:13+00:00
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2025-10-31 17:27:17+00:00
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2025-10-31 17:27:15+00:00
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MEMBER
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PR_kwDODunzps6wHK9e
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Add DICOM support
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2025-11-15 19:19:26+00:00
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CONTRIBUTOR
| null | null | null | null |
supports #7804
Add support for the dicom file format.
This PR follows PR #7815 and PR #7325 closely.
Remarkable differences:
I made sure that we can load all of pydicom's test data, and encountered the `force=True` parameter that we explicitly support here. This allows to trying to load corrupted dicom files, we explicitly test this!
There is one dataset with all of dicom's test data on huggingface which can be loaded using this branch with the following script:
```python
from datasets import load_dataset
from datasets import Features, ClassLabel
from datasets.features import Dicom
features = Features({
"dicom": Dicom(force=True), # necessary to be able to load one corrupted file
"label": ClassLabel(num_classes=2)
})
ds = load_dataset("TobiasPitters/dicom-sample-dataset",
features=features)
error_count = 0
for idx, item in enumerate(ds["test"]):
dicom = item["dicom"]
try:
print(f"Type: {type(dicom)}")
if hasattr(dicom, 'PatientID'):
print(f"PatientID: {dicom.PatientID}")
if hasattr(dicom, 'StudyInstanceUID'):
print(f"StudyInstanceUID: {dicom.StudyInstanceUID}")
if hasattr(dicom, 'Modality'):
print(f"Modality: {dicom.Modality}")
except Exception as e:
error_count += 1
print(e)
print(f"Finished processing with {error_count} errors.")
```
todo:
- [x] add docs (will do so soon)
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I_kwDODunzps7UHwYP
| 7,834
|
Audio.cast_column() or Audio.decode_example() causes Colab kernel crash (std::bad_alloc)
|
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2025-11-15 16:28:04+00:00
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NONE
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### Describe the bug
When using the huggingface datasets.Audio feature to decode a local or remote (public HF dataset) audio file inside Google Colab, the notebook kernel crashes with std::bad_alloc (C++ memory allocation failure).
The crash happens even with a minimal code example and valid .wav file that can be read successfully using soundfile.
Here is a sample Collab notebook to reproduce the problem.
https://colab.research.google.com/drive/1nnb-GC5748Tux3xcYRussCGp2x-zM9Id?usp=sharing
code sample:
```
...
audio_dataset = audio_dataset.cast_column("audio", Audio(sampling_rate=16000))
# Accessing the first element crashes the Colab kernel
print(audio_dataset[0]["audio"])
```
Error log
```
WARNING what(): std::bad_alloc
terminate called after throwing an instance of 'std::bad_alloc'
```
Environment
Platform: Google Colab (Python 3.12.12)
datasets Version: 4.3.0
soundfile Version: 0.13.1
torchaudio Version: 2.8.0+cu126
Thanks in advance to help me on this error I get approx two weeks now after it was working before.
Regards
### Steps to reproduce the bug
https://colab.research.google.com/drive/1nnb-GC5748Tux3xcYRussCGp2x-zM9Id?usp=sharing
### Expected behavior
Loading the audio and decode it.
It should safely return:
{
"path": "path/filaname.wav",
"array": np.ndarray([...]),
"sampling_rate": 16000
}
### Environment info
Environment
Platform: Google Colab (Python 3.12.12)
datasets Version: 4.3.0
soundfile Version: 0.13.1
torchaudio Version: 2.8.0+cu126
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PR_kwDODunzps6v2gAI
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|
Fix: Properly render [!TIP] block in stream.shuffle documentation
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2025-10-27 10:09:31+00:00
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2025-10-28 15:57:33+00:00
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2025-10-28 15:57:33+00:00
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CONTRIBUTOR
| null | null | null | null |
The second line starting with the bracket doesn't properly render on huggingface/docs. Added "> " to address it.
In the client documentation, the markdown 'TIP' paragraph in docs/stream#shuffle is not well executed, not as the other in the same page / while markdown is correctly considering it.
Documentation:
https://huggingface.co/docs/datasets/v4.3.0/en/stream#shuffle:~:text=%5B!TIP%5D%5BIterableDataset.shuffle()%5D(/docs/datasets/v4.3.0/en/package_reference/main_classes%23datasets.IterableDataset.shuffle)%20will%20also%20shuffle%20the%20order%20of%20the%20shards%20if%20the%20dataset%20is%20sharded%20into%20multiple%20files.
Github source:
https://github.com/huggingface/datasets/blob/main/docs/source/stream.mdx#:~:text=Casting%20only%20works%20if%20the%20original%20feature%20type%20and%20new%20feature%20type%20are%20compatible.%20For%20example%2C%20you%20can%20cast%20a%20column%20with%20the%20feature%20type%20Value(%27int32%27)%20to%20Value(%27bool%27)%20if%20the%20original%20column%20only%20contains%20ones%20and%20zeros.
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I_kwDODunzps7T9CAA
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[DOCS][minor] TIPS paragraph not compiled in docs/stream
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In the client documentation, the markdown 'TIP' paragraph for paragraph in docs/stream#shuffle is not well executed — not as the other in the same page / while markdown is correctly considering it.
Documentation:
https://huggingface.co/docs/datasets/v4.3.0/en/stream#shuffle:~:text=%5B!TIP%5D%5BIterableDataset.shuffle()%5D(/docs/datasets/v4.3.0/en/package_reference/main_classes%23datasets.IterableDataset.shuffle)%20will%20also%20shuffle%20the%20order%20of%20the%20shards%20if%20the%20dataset%20is%20sharded%20into%20multiple%20files.
Github source:
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PR_kwDODunzps6vp0pz
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resolves the ValueError: Unable to avoid copy while creating an array
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2025-10-29 06:35:32+00:00
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CONTRIBUTOR
| null | null | null | null |
## Summary
Fixes #7818
This PR resolves the `ValueError: Unable to avoid copy while creating an array` error that occurs when using `train_test_split` with `stratify_by_column` parameter in NumPy 2.0+.
## Changes
- Wrapped the stratify column array access with `np.asarray()` in `arrow_dataset.py`
- This allows NumPy 2.0 to make a copy when the Arrow array is non-contiguous in memory
## Testing
- ✅ Tested with NumPy 2.3.4 - stratified splits work correctly
- ✅ Tested with NumPy 1.26.4 - backward compatibility maintained
- ✅ Verified class balance is preserved in stratified splits
- ✅ Non-stratified splits continue to work as expected
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fix ci compressionfs
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Memory leak / Large memory usage with num_workers = 0 and numerous dataset within DatasetDict
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### Describe the bug
Hi team, first off, I love the datasets library! 🥰
I'm encountering a potential memory leak / increasing memory usage when training a model on a very large DatasetDict.
Setup: I have a DatasetDict containing 362 distinct datasets, which sum up to ~2.8 billion rows.
Training Task: I'm performing contrastive learning with SentenceTransformer and Accelerate on a single node with 4 H100, which requires me to sample from only one dataset at a time.
Training Loop: At each training step, I sample ~16,000 examples from a single dataset, and then switch to a different dataset for the next step. I iterate through all 362 datasets this way.
Problem: The process's memory usage continuously increases over time, eventually causing a stale status where GPUs would stop working. It seems memory from previously sampled datasets isn't being released. I've set num_workers=0 for all experiments.
Chart 1: Standard DatasetDict The memory usage grows steadily until it make the training stale (RSS memory) <img width="773" height="719" alt="Image" src="https://github.com/user-attachments/assets/6606bef5-1153-4f2d-bf08-82da249d6e8d" />
Chart 2: IterableDatasetDict I also tried to use IterableDatasetDict and IterableDataset. The memory curve is "smoother," but the result is the same: it grows indefinitely and the training become stale. <img width="339" height="705" alt="Image" src="https://github.com/user-attachments/assets/ee90c1a1-6c3b-4135-9edc-90955cb1695a" />
Any feedback or guidance on how to manage this memory would be greatly appreciated!
### Steps to reproduce the bug
WIP, I'll add some code that manage to reproduce this error, but not straightforward.
### Expected behavior
The memory usage should remain relatively constant or plateau after a few steps. Memory used for sampling one dataset should be released before or during the sampling of the next dataset.
### Environment info
Python: 3.12
Datasets: 4.3.0
SentenceTransformers: 5.1.1
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[] | null | 1
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2025-10-22 14:42:47+00:00
|
2025-11-05 11:02:14+00:00
|
NaT
|
CONTRIBUTOR
| null | null | null | null |
Fixes #7821
In addition to the solution proposed in the issue, I encountered we also need to support 64bit types when writing using the `RecordBatchStreamWriter`.
Not sure if we want to create such large objects in the CI, but this is the only way to test that the issue is fixed, therefore I added the unit test.
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PR_kwDODunzps6ukXe9
| 7,824
|
Fix batch_size default description in to_polars docstrings
|
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2025-10-20 13:49:25+00:00
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2025-10-20 13:49:24+00:00
|
MEMBER
| null | null | null | null |
Fix batch_size default description in `to_polars` docstrings.
|
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PR_kwDODunzps6uRkGa
| 7,823
|
Fix random seed on shuffle and interleave_datasets
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2025-10-17 10:21:47+00:00
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2025-10-24 14:21:22+00:00
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2025-10-24 14:04:36+00:00
|
CONTRIBUTOR
| null | null | null | null |
closes #7567
Add `shift_rngs` method to `ExamplesIterable` that is called directly after sharding. If a generator is available (not the case for all subclasses) we update the seed of the generator by shifting by the worker_id.
~This is just the fix for `shuffle`, in the corresponding issue `interleave_datasets` is mentioned as well, which won't be fixed with this approach.~
EDIT: This is a fix for `shuffle` and `interleave_datasets`. Adding recursivity to `shift_rngs` solved `interleave_datasets` as well. Not sure though if this is completely safe or if we could destroy something with that. I don't think so but could be wrong and appreciate some guidance from the maintainers. I also checked, on a single_worker we are always handing over `index=0` so that case preserves the seed the user specified.
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PR_kwDODunzps6uRKIJ
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|
Retry open hf file
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2025-10-17 09:52:05+00:00
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2025-10-17 09:51:35+00:00
|
MEMBER
| null | null | null | null |
Fix this error
```python
File "/workdir/.venv/lib/python3.13/site-packages/datasets/utils/file_utils.py", line 934, in xopen
file_obj = fsspec.open(file, mode=mode, *args, **kwargs).open()
File "/workdir/.venv/lib/python3.13/site-packages/fsspec/core.py", line 147, in open
return self.__enter__()
~~~~~~~~~~~~~~^^
File "/workdir/.venv/lib/python3.13/site-packages/fsspec/core.py", line 105, in __enter__
f = self.fs.open(self.path, mode=mode)
File "/workdir/.venv/lib/python3.13/site-packages/fsspec/spec.py", line 1338, in open
f = self._open(
path,
...<4 lines>...
**kwargs,
)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_file_system.py", line 275, in _open
return HfFileSystemFile(self, path, mode=mode, revision=revision, block_size=block_size, **kwargs)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_file_system.py", line 950, in __init__
self.resolved_path = fs.resolve_path(path, revision=revision)
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_file_system.py", line 198, in resolve_path
repo_and_revision_exist, err = self._repo_and_revision_exist(repo_type, repo_id, revision)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_file_system.py", line 125, in _repo_and_revision_exist
self._api.repo_info(
~~~~~~~~~~~~~~~~~~~^
repo_id, revision=revision, repo_type=repo_type, timeout=constants.HF_HUB_ETAG_TIMEOUT
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/utils/_validators.py", line 114, in _inner_fn
return fn(*args, **kwargs)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_api.py", line 2864, in repo_info
return method(
repo_id,
...<4 lines>...
files_metadata=files_metadata,
)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/utils/_validators.py", line 114, in _inner_fn
return fn(*args, **kwargs)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/hf_api.py", line 2721, in dataset_info
r = get_session().get(path, headers=headers, timeout=timeout, params=params)
File "/workdir/.venv/lib/python3.13/site-packages/requests/sessions.py", line 602, in get
return self.request("GET", url, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
File "/workdir/.venv/lib/python3.13/site-packages/requests/sessions.py", line 589, in request
resp = self.send(prep, **send_kwargs)
File "/workdir/.venv/lib/python3.13/site-packages/requests/sessions.py", line 703, in send
r = adapter.send(request, **kwargs)
File "/workdir/.venv/lib/python3.13/site-packages/huggingface_hub/utils/_http.py", line 95, in send
return super().send(request, *args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workdir/.venv/lib/python3.13/site-packages/requests/adapters.py", line 690, in send
raise ReadTimeout(e, request=request)
requests.exceptions.ReadTimeout: (ReadTimeoutError("HTTPSConnectionPool(host='huggingface.co', port=443): Read timed out. (read timeout=10)"), '(Request ID: e7e1ae72-54a0-4ce4-b011-144fb7a3fb06)')
```
which could also be related to
```python
File "/workdir/.venv/lib/python3.13/site-packages/datasets/utils/file_utils.py", line 1364, in _iter_from_urlpaths
raise FileNotFoundError(urlpath)
FileNotFoundError: hf://datasets/.../train-00013-of-00031.parquet
```
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I_kwDODunzps7R3N8r
| 7,821
|
Building a dataset with large variable size arrays results in error ArrowInvalid: Value X too large to fit in C integer type
|
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[] | null | 1
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2025-10-16 08:45:17+00:00
|
2025-10-20 13:42:05+00:00
|
NaT
|
CONTRIBUTOR
| null | null |
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### Describe the bug
I used map to store raw audio waveforms of variable lengths in a column of a dataset the `map` call fails with ArrowInvalid: Value X too large to fit in C integer type.
```
Traceback (most recent call last):
Traceback (most recent call last):
File "...lib/python3.12/site-packages/multiprocess/pool.py", line 125, in worker
result = (True, func(*args, **kwds))
^^^^^^^^^^^^^^^^^^^
File "...lib/python3.12/site-packages/datasets/utils/py_utils.py", line 678, in _write_generator_to_queue
for i, result in enumerate(func(**kwargs)):
^^^^^^^^^^^^^^^^^^^^^^^^^
File "...lib/python3.12/site-packages/datasets/arrow_dataset.py", line 3526, in _map_single
writer.write_batch(batch)
File "...lib/python3.12/site-packages/datasets/arrow_writer.py", line 605, in write_batch
arrays.append(pa.array(typed_sequence))
^^^^^^^^^^^^^^^^^^^^^^^^
File "pyarrow/array.pxi", line 252, in pyarrow.lib.array
File "pyarrow/array.pxi", line 114, in pyarrow.lib._handle_arrow_array_protocol
File "...lib/python3.12/site-packages/datasets/arrow_writer.py", line 225, in __arrow_array__
out = list_of_np_array_to_pyarrow_listarray(data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "...lib/python3.12/site-packages/datasets/features/features.py", line 1538, in list_of_np_array_to_pyarrow_listarray
return list_of_pa_arrays_to_pyarrow_listarray(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "...lib/python3.12/site-packages/datasets/features/features.py", line 1530, in list_of_pa_arrays_to_pyarrow_listarray
offsets = pa.array(offsets, type=pa.int32())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "pyarrow/array.pxi", line 362, in pyarrow.lib.array
File "pyarrow/array.pxi", line 87, in pyarrow.lib._ndarray_to_array
File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Value 2148479376 too large to fit in C integer type
```
### Steps to reproduce the bug
Calling map on a dataset that returns a column with long 1d numpy arrays of variable length.
Example:
```python
# %%
import logging
import datasets
import pandas as pd
import numpy as np
# %%
def process_batch(batch, rank):
res = []
for _ in batch["id"]:
res.append(np.zeros((2**30)).astype(np.uint16))
return {"audio": res}
if __name__ == "__main__":
df = pd.DataFrame(
{
"id": list(range(400)),
}
)
ds = datasets.Dataset.from_pandas(df)
try:
from multiprocess import set_start_method
set_start_method("spawn")
except RuntimeError:
print("Spawn method already set, continuing...")
mapped_ds = ds.map(
process_batch,
batched=True,
batch_size=2,
with_rank=True,
num_proc=2,
cache_file_name="path_to_cache/tmp.arrow",
writer_batch_size=200,
remove_columns=ds.column_names,
# disable_nullable=True,
)
```
### Expected behavior
I think the offsets should be pa.int64() if needed and not forced to be `pa.int32()`
in https://github.com/huggingface/datasets/blob/3e13d30823f8ec498d56adbc18c6880a5463b313/src/datasets/features/features.py#L1535
### Environment info
- `datasets` version: 3.3.1
- Platform: Linux-5.15.0-94-generic-x86_64-with-glibc2.35
- Python version: 3.12.9
- `huggingface_hub` version: 0.29.0
- PyArrow version: 19.0.1
- Pandas version: 2.2.3
- `fsspec` version: 2024.12.0
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| 3,518,633,577
|
PR_kwDODunzps6t6suZ
| 7,820
|
Keep hffs cache in workers when streaming
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2025-10-15 15:51:28+00:00
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2025-10-17 09:59:17+00:00
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2025-10-17 09:59:16+00:00
|
MEMBER
| null | null | null | null |
(and also reorder the hffs args to improve caching)
When using `DataLoader(iterable_dataset, num_workers=...)` the dataset is pickled and passed to the worker. However previously the resulting dataset would be in a process with an empty hffs cache. By keeping the cache attached to `IterableDataset`, the cached hffs instances are pickled with the dataset and re-populates the cache in the DataLoader workers
this requires https://github.com/huggingface/huggingface_hub/pull/3443 to work effectively though, otherwise the unpickled hffs cache would start empty
cc @andimarafioti @ltmeyer
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I_kwDODunzps7Ronme
| 7,819
|
Cannot download opus dataset
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2025-10-15 09:06:19+00:00
|
2025-10-20 13:45:16+00:00
|
NaT
|
NONE
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When I tried to download opus_books using:
from datasets import load_dataset
dataset = load_dataset("Helsinki-NLP/opus_books")
I got the following errors:
FileNotFoundError: Couldn't find any data file at /workspace/Helsinki-NLP/opus_books. Couldn't find 'Helsinki-NLP/opus_books' on the Hugging Face Hub either: LocalEntryNotFoundError: An error happened while trying to locate the file on the Hub and we cannot find the requested files in the local cache. Please check your connection and try again or make sure your Internet connection is on.
I also tried:
dataset = load_dataset("opus_books", "en-zh")
and the errors remain the same. However, I can download "mlabonne/FineTome-100k" successfully.
My datasets is version 4.2.0
Any clues? Big thanks.
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I_kwDODunzps7RkDAC
| 7,818
|
train_test_split and stratify breaks with Numpy 2.0
|
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2025-10-15 00:01:19+00:00
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2025-10-28 16:10:44+00:00
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### Describe the bug
As stated in the title, since Numpy changed in version >2.0 with copy, the stratify parameters break.
e.g. `all_dataset.train_test_split(test_size=0.2,stratify_by_column="label")` returns a Numpy error.
It works if you downgrade Numpy to a version lower than 2.0.
### Steps to reproduce the bug
1. Numpy > 2.0
2. `all_dataset.train_test_split(test_size=0.2,stratify_by_column="label")`
### Expected behavior
It returns a stratified split as per the results of Numpy < 2.0
### Environment info
- `datasets` version: 2.14.4
- Platform: Linux-6.8.0-85-generic-x86_64-with-glibc2.35
- Python version: 3.13.7
- Huggingface_hub version: 0.34.4
- PyArrow version: 19.0.0
- Pandas version: 2.3.2
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PR_kwDODunzps6tw-GG
| 7,817
|
fix: better args passthrough for `_batch_setitems()`
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2025-10-14 22:51:51+00:00
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2025-10-28 17:32:12+00:00
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2025-10-27 17:08:25+00:00
|
CONTRIBUTOR
| null | null | null | null |
In Python 3.14, there's a change in the signature of `_Pickler._batch_setitems`.
It's changed to:
```python
# pickle.py
def _batch_setitems(self, items, obj):
# Helper to batch up SETITEMS sequences; proto >= 1 only
save = self.save
write = self.write
```
To accomodate this, in `dill`, we have this compatibility code:
```python
if sys.hexversion < 0x30E00A1:
pickler._batch_setitems(iter(source.items()))
else:
pickler._batch_setitems(iter(source.items()), obj=obj)
```
Thus, the datasets package will emit this error
```
│ /Users/sghuang/mamba/envs/ds/lib/python3.14/site-packages/dill/_dill.py:1262 in save_module_dict │
│ │
│ 1259 │ │ if is_dill(pickler, child=False) and pickler._session: │
│ 1260 │ │ │ # we only care about session the first pass thru │
│ 1261 │ │ │ pickler._first_pass = False │
│ ❱ 1262 │ │ StockPickler.save_dict(pickler, obj) │
│ 1263 │ │ logger.trace(pickler, "# D2") │
│ 1264 │ return │
│ 1265 │
│ │
│ /Users/sghuang/mamba/envs/ds/lib/python3.14/pickle.py:1133 in save_dict │
│ │
│ 1130 │ │ print(f"Line number: {inspect.getsourcelines(method)[1]}") │
│ 1131 │ │ print(f"Full path: {inspect.getmodule(method)}") │
│ 1132 │ │ print(f"Class: {method.__qualname__}") │
│ ❱ 1133 │ │ self._batch_setitems(obj.items(), obj) │
│ 1134 │ │
│ 1135 │ dispatch[dict] = save_dict │
│ 1136 │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
[NOTE] when serializing datasets.table.InMemoryTable state
[NOTE] when serializing datasets.table.InMemoryTable object
```
To fix it, we update the signature of the `_batch_setitems` method defined in `utils/_dill.py`.
This fix should be backward compatible, since the compatibility is handled by `dill`.
This should close #7813.
Similar to https://github.com/joblib/joblib/issues/1658.
Related to https://github.com/uqfoundation/dill/pull/724.
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I_kwDODunzps7RWBMe
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|
disable_progress_bar() not working as expected
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2025-10-14 03:25:39+00:00
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### Describe the bug
Hi,
I'm trying to load a dataset on Kaggle TPU image. There is some known compat issue with progress bar on Kaggle, so I'm trying to disable the progress bar globally. This does not work as you can see in [here](https://www.kaggle.com/code/windmaple/hf-datasets-issue).
In contract, disabling progress bar for snapshot_download() works as expected as in [here](https://www.kaggle.com/code/windmaple/snapshot-download-error).
### Steps to reproduce the bug
See this [notebook](https://www.kaggle.com/code/windmaple/hf-datasets-issue).
There is sth. wrong with `shell_paraent`.
### Expected behavior
The downloader should disable progress bar and move forward w/ no error.
### Environment info
The latest version as I did:
!pip install -U datasets ipywidgets ipykernel
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| 3,511,338,522
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PR_kwDODunzps6tiDIT
| 7,815
|
Add nifti support
|
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2025-10-13 20:07:32+00:00
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2025-11-07 00:52:01+00:00
|
2025-10-24 13:22:18+00:00
|
CONTRIBUTOR
| null | null | null | null |
Add support for NIfTI.
supports #7804
This PR follows https://github.com/huggingface/datasets/pull/7325 very closely
I am a bit unsure what we need to add to the `document_dataset.mdx` and `document_load.mdx`. I should probably create a dataset on the hub first to create this guide instead of copy+pasting from PDF.
Open todos:
- [x] create nifti dataset on the hub
- ~[ ] update `document_dataset.mdx` and `document_load.mdx`~
EDIT:
I tested with two datasets I created on the hub:
- https://huggingface.co/datasets/TobiasPitters/test-nifti-unzipped
- https://huggingface.co/datasets/TobiasPitters/test-nifti
for zipped (file extension `.nii.gz` and unzipped `.nii`) files and both seem to work fine. Also tested loading locally and that seems to work as well.
Here is the scriptsthat I ran against the hub:
```python
from pathlib import Path
from datasets import load_dataset
import nibabel as nib
dataset = load_dataset(
"TobiasPitters/test-nifti-unzipped",
split="test" # Load as single Dataset, not DatasetDict
)
print("length dataset unzipped:", len(dataset))
for item in dataset:
isinstance(item["nifti"], nib.nifti1.Nifti1Image)
dataset = load_dataset(
"TobiasPitters/test-nifti",
split="train" # Load as single Dataset, not DatasetDict
)
print("length dataset zipped:", len(dataset))
for item in dataset:
isinstance(item["nifti"], nib.nifti1.Nifti1Image)
```
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| 3,510,488,792
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PR_kwDODunzps6tfJCm
| 7,814
|
Allow streaming hdf5 files
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2025-10-13 15:25:44+00:00
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2025-10-13 15:28:51+00:00
|
2025-10-13 15:28:49+00:00
|
MEMBER
| null | null | null | null |
Add streaming support after https://github.com/huggingface/datasets/pull/7690, cc @klamike :)
## Details
in `datasets` loaders, `open()` is extended to work with files that are on disk but also on HF. Files on HF are streamed using HTTP range requests using the `HfFileSystem` implementation in the `huggingface_hub` library.
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|
I_kwDODunzps7Q0lkQ
| 7,813
|
Caching does not work when using python3.14
|
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2025-10-10 15:36:46+00:00
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2025-10-27 17:08:26+00:00
|
2025-10-27 17:08:26+00:00
|
NONE
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### Describe the bug
Traceback (most recent call last):
File "/workspace/ctn.py", line 8, in <module>
ds = load_dataset(f"naver-clova-ix/synthdog-{lang}") # или "synthdog-zh" для китайского
File "/workspace/.venv/lib/python3.14/site-packages/datasets/load.py", line 1397, in load_dataset
builder_instance = load_dataset_builder(
path=path,
...<10 lines>...
**config_kwargs,
)
File "/workspace/.venv/lib/python3.14/site-packages/datasets/load.py", line 1185, in load_dataset_builder
builder_instance._use_legacy_cache_dir_if_possible(dataset_module)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/builder.py", line 612, in _use_legacy_cache_dir_if_possible
self._check_legacy_cache2(dataset_module) or self._check_legacy_cache() or None
~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/builder.py", line 485, in _check_legacy_cache2
config_id = self.config.name + "-" + Hasher.hash({"data_files": self.config.data_files})
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/fingerprint.py", line 188, in hash
return cls.hash_bytes(dumps(value))
~~~~~^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 120, in dumps
dump(obj, file)
~~~~^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 114, in dump
Pickler(file, recurse=True).dump(obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 428, in dump
StockPickler.dump(self, obj)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 498, in dump
self.save(obj)
~~~~~~~~~^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 70, in save
dill.Pickler.save(self, obj, save_persistent_id=save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 422, in save
StockPickler.save(self, obj, save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 572, in save
f(self, obj) # Call unbound method with explicit self
~^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 1262, in save_module_dict
StockPickler.save_dict(pickler, obj)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 1064, in save_dict
self._batch_setitems(obj.items(), obj)
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
### Steps to reproduce the bug
ds_train = ds["train"].map(lambda x: {**x, "lang": lang})
### Expected behavior
Fixed bugs
### Environment info
- `datasets` version: 4.2.0
- Platform: Linux-6.8.0-85-generic-x86_64-with-glibc2.39
- Python version: 3.14.0
- `huggingface_hub` version: 0.35.3
- PyArrow version: 21.0.0
- Pandas version: 2.3.3
- `fsspec` version: 2025.9.0
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PR_kwDODunzps6s_New
| 7,812
|
docs: document_dataset PDFs & OCR
|
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2025-10-09 23:31:41+00:00
|
2025-10-20 14:03:53+00:00
|
2025-10-20 14:03:53+00:00
|
CONTRIBUTOR
| null | null | null | null |
Use acronyms consistently across document_dataset docs.
|
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SIGSEGV when Python exits due to near null deref
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### Describe the bug
When I run the following python script using datasets I get a segfault.
```python
from datasets import load_dataset
from tqdm import tqdm
progress_bar = tqdm(total=(1000), unit='cols', desc='cols ')
progress_bar.update(1)
```
```
% lldb -- python3 crashmin.py
(lldb) target create "python3"
Current executable set to '/Users/ian/bug/venv/bin/python3' (arm64).
(lldb) settings set -- target.run-args "crashmin.py"
(lldb) r
Process 8095 launched: '/Users/ian/bug/venv/bin/python3' (arm64)
Process 8095 stopped
* thread #2, stop reason = exec
frame #0: 0x0000000100014b30 dyld`_dyld_start
dyld`_dyld_start:
-> 0x100014b30 <+0>: mov x0, sp
0x100014b34 <+4>: and sp, x0, #0xfffffffffffffff0
0x100014b38 <+8>: mov x29, #0x0 ; =0
Target 0: (Python) stopped.
(lldb) c
Process 8095 resuming
cols : 0% 0/1000 [00:00<?, ?cols/s]Process 8095 stopped
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x0000000101783454 _datetime.cpython-313-darwin.so`delta_new + 188
_datetime.cpython-313-darwin.so`delta_new:
-> 0x101783454 <+188>: ldr x3, [x20, #0x10]
0x101783458 <+192>: adrp x0, 10
0x10178345c <+196>: add x0, x0, #0x6fc ; "seconds"
Target 0: (Python) stopped.
(lldb) bt
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
* frame #0: 0x0000000101783454 _datetime.cpython-313-darwin.so`delta_new + 188
frame #1: 0x0000000100704b60 Python`type_call + 96
frame #2: 0x000000010067ba34 Python`_PyObject_MakeTpCall + 120
frame #3: 0x00000001007aae3c Python`_PyEval_EvalFrameDefault + 30236
frame #4: 0x000000010067c900 Python`PyObject_CallOneArg + 112
frame #5: 0x000000010070f0a0 Python`slot_tp_finalize + 116
frame #6: 0x000000010070c3b4 Python`subtype_dealloc + 788
frame #7: 0x00000001006c378c Python`insertdict + 756
frame #8: 0x00000001006db2b0 Python`_PyModule_ClearDict + 660
frame #9: 0x000000010080a9a8 Python`finalize_modules + 1772
frame #10: 0x0000000100809a44 Python`_Py_Finalize + 264
frame #11: 0x0000000100837630 Python`Py_RunMain + 252
frame #12: 0x0000000100837ef8 Python`pymain_main + 304
frame #13: 0x0000000100837f98 Python`Py_BytesMain + 40
frame #14: 0x000000019cfcc274 dyld`start + 2840
(lldb) register read x20
x20 = 0x0000000000000000
(lldb)
```
### Steps to reproduce the bug
Run the script above, and observe the segfault.
### Expected behavior
No segfault
### Environment info
```
% pip freeze datasets | grep -i datasets
datasets==4.2.0
(venv) 0 ~/bug 14:58:06
% pip freeze tqdm | grep -i tqdm
tqdm==4.67.1
(venv) 0 ~/bug 14:58:16
% python --version
Python 3.13.7
```
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fix conda deps
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Set dev version
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add an s to be consistent with pandas' on_bad_lines
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| 3,499,483,246
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PR_kwDODunzps6s6gnr
| 7,806
|
Parquet: add `on_bad_file` argument to error/warn/skip bad files
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```python
from datasets import load_dataset
on_bad_file = "error" # default
# on_bad_file = "warn" # warn and skip bad file
# on_bad_file = "skip" # skip bad file
ds = load_dataset(parquet_dataset_id, on_bad_file=on_bad_file)
```
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Less api calls when resolving data_files
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2025-10-09 14:01:57+00:00
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There ~10 unnecessary `/api/datasets/user/dataset/revision`calls due to multithreading in data files resolution.
I disabled multithreading, which was actually not useful anymore since `HfFileSystem` has been using caching for a while now.
|
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I_kwDODunzps7Qh2bE
| 7,804
|
Support scientific data formats
|
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List of formats and libraries we can use to load the data in `datasets`:
- [ ] DICOMs: pydicom
- [x] NIfTIs: nibabel
- [ ] WFDB: wfdb
cc @zaRizk7 for viz
Feel free to comment / suggest other formats and libs you'd like to see or to share your interest in one of the mentioned format
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More Parquet streaming docs
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[Docs] Missing documentation for `Dataset.from_dict`
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Documentation link: https://huggingface.co/docs/datasets/en/package_reference/main_classes
Link to method (docstring present): https://github.com/huggingface/datasets/blob/6f2502c5a026caa89839713f6f7c8b958e5e83eb/src/datasets/arrow_dataset.py#L1029
The docstring is present for the function, but seems missing from the official documentation for the `Dataset` class on HuggingFace.
The method in question:
```python
@classmethod
def from_dict(
cls,
mapping: dict,
features: Optional[Features] = None,
info: Optional[DatasetInfo] = None,
split: Optional[NamedSplit] = None,
) -> "Dataset":
"""
Convert `dict` to a `pyarrow.Table` to create a [`Dataset`].
Important: a dataset created with from_dict() lives in memory
and therefore doesn't have an associated cache directory.
This may change in the future, but in the meantime if you
want to reduce memory usage you should write it back on disk
and reload using e.g. save_to_disk / load_from_disk.
Args:
mapping (`Mapping`):
Mapping of strings to Arrays or Python lists.
features ([`Features`], *optional*):
Dataset features.
info (`DatasetInfo`, *optional*):
Dataset information, like description, citation, etc.
split (`NamedSplit`, *optional*):
Name of the dataset split.
Returns:
[`Dataset`]
"""
```
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Add parquet scan options and docs
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I added scan options, useful to control buffering and caching when streaming and docs, including how to select a subset of columns and apply filters
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PR_kwDODunzps6sqkmT
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|
Fix polars cast column image
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2025-10-08 10:01:18+00:00
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2025-10-18 13:48:37+00:00
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2025-10-13 14:39:47+00:00
|
CONTRIBUTOR
| null | null | null | null |
Fixes #7765
The problem here is that polars uses pyarrow large_string for images, while pandas and others just use the string type. This PR solves that and adds a test.
```python
import polars as pl
from datasets import Dataset
import pandas as pd
import pyarrow as pa
from pathlib import Path
shared_datadir = Path("tests/features/data")
image_path = str(shared_datadir / "test_image_rgb.jpg")
# Load via polars
df_polars = pl.DataFrame({"image_path": [image_path]})
dataset_polars = Dataset.from_polars(df_polars)
print("Polars DF is large string:", pa.types.is_large_string(df_polars.to_arrow().schema[0].type))
print("Polars DF is string:", pa.types.is_string(df_polars.to_arrow().schema[0].type))
# Load via pandas
df_pandas = pd.DataFrame({"image_path": [image_path]})
dataset_pandas = Dataset.from_pandas(df_pandas)
arrow_table_pd = pa.Table.from_pandas(df_pandas)
print("Pandas DF is large string", pa.types.is_large_string(arrow_table_pd.schema[0].type))
print("Pandas DF is string", pa.types.is_string(arrow_table_pd.schema[0].type))
```
Outputs:
```bash
Polars DF is large string: True
Polars DF is string: False
Pandas DF is large string False
Pandas DF is string True
```
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Define CI future
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2025-10-06 15:15:45+00:00
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2025-10-07 14:30:21+00:00
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2025-10-07 14:30:19+00:00
|
MEMBER
| null | null | null | null |
this should fix the CI which currently uses transformers on 3.9 while it's now unsupported
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I_kwDODunzps7PsM3-
| 7,798
|
Audio dataset is not decoding on 4.1.1
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[] | null | 3
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2025-10-05 06:37:50+00:00
|
2025-10-06 14:07:55+00:00
|
NaT
|
NONE
| null | null |
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|
### Describe the bug
The audio column remain as non-decoded objects even when accessing them.
```python
dataset = load_dataset("MrDragonFox/Elise", split = "train")
dataset[0] # see that it doesn't show 'array' etc...
```
Works fine with `datasets==3.6.0`
Followed the docs in
- https://huggingface.co/docs/datasets/en/audio_load
### Steps to reproduce the bug
```python
dataset = load_dataset("MrDragonFox/Elise", split = "train")
dataset[0] # see that it doesn't show 'array' etc...
```
### Expected behavior
It should decode when accessing the elemenet
### Environment info
4.1.1
ubuntu 22.04
Related
- https://github.com/huggingface/datasets/issues/7707
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PR_kwDODunzps6rhtf_
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|
Datasets: Add WMT21 & WMT22 loaders (basic TSV loaders, sample data, tests)
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2025-10-01 10:46:01+00:00
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2025-10-10 15:33:25+00:00
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2025-10-10 15:33:25+00:00
|
NONE
| null | null | null | null |
- Implemented TSV-based dataset loaders:
- WMT21Dataset (local_datasets/wmt21/wmt21_dataset.py)
- WMT22Dataset (local_datasets/wmt22/wmt22_dataset.py)
These classes load source-target pairs from .tsv files for train, validation, and test splits.
- Created sample dummy data for both datasets:
- dummy_data/train.tsv, dummy_data/validation.tsv, dummy_data/test.tsv
- Includes a few realistic example lines to allow CI and local tests to pass without downloading full datasets.
- Added automated tests for robust validation:
- tests/test_wmt21.py and tests/test_wmt22.py
- Checks that all splits load correctly, empty lines are ignored, and the number of examples matches the number of lines in the .tsv files.
- Edge cases handled: empty lines, malformed lines, extra tabs.
- Added README.md files for both datasets:
- Provides dataset structure, usage instructions, and placeholders for citation & license information.
- Ensures that other developers and reviewers can understand dataset usage immediately.
- Ensured easy local testing:
- Load datasets programmatically using WMT21Dataset / WMT22Dataset.
- Verified train/validation/test splits are correctly returned as Python dictionaries of Dataset objects.
-Provides initial support for WMT21 and WMT22 NLP/translation experiments.
-Allows contributors and reviewers to test dataset loading locally or in CI without downloading large datasets.
-Serves as a template to extend to other WMT datasets in the future.
Testing instructions:
```
# Activate your environment
pytest tests/test_wmt21.py -v
pytest tests/test_wmt22.py -v
```
```
from local_datasets.wmt21.wmt21_dataset import WMT21Dataset
from local_datasets.wmt22.wmt22_dataset import WMT22Dataset
# WMT21
wmt21 = WMT21Dataset("local_datasets/wmt21/dummy_data")
ds21 = wmt21.load()
print(ds21["train"][0])
print(ds21["validation"][0])
print(ds21["test"][0])
# WMT22
wmt22 = WMT22Dataset("local_datasets/wmt22/dummy_data")
ds22 = wmt22.load()
print(ds22["train"][0])
print(ds22["validation"][0])
print(ds22["test"][0])
```
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PR_kwDODunzps6rZjrW
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|
Docs: fix typo, improve readability, add code comments
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2025-09-30 18:34:16+00:00
|
2025-10-10 18:44:12+00:00
|
NaT
|
NONE
| null | null | null | null |
What I did:
- Fixed a small typo in README to improve clarity
- Fixed repeated word "frameworks frameworks"
- Split long paragraphs into shorter sentences for readability
- Added # Example comments before code blocks for clarity
Why:
- Helps new users avoid confusion
How I tested:
- Checked locally in Markdown preview
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Add pyarrow's binary view to features
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2025-09-29 09:12:55+00:00
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2025-10-10 16:04:21+00:00
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2025-10-10 16:04:21+00:00
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CONTRIBUTOR
| null | null | null | null |
Basically https://github.com/huggingface/datasets/pull/7718 just for binary view instead of string view
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PR_kwDODunzps6q4XyU
| 7,794
|
Fix nested data conversions error in parquet loading (fixes #7793)
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2025-09-27 22:04:13+00:00
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2025-10-01 16:56:20+00:00
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NaT
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NONE
| null | null | null | null |
Fixes #7793
## Problem
Loading datasets with deeply nested structures (like `metr-evals/malt-public`) fails with:
ArrowNotImplementedError: Nested data conversions not implemented for chunked array outputs
This occurs when parquet files contain nested data (lists, structs, maps) that exceed PyArrow's 16MB chunk limit.
## Root Cause
PyArrow's C++ implementation explicitly rejects nested data conversions when data is split across multiple chunks. The limitation exists in the `WrapIntoListArray` function where repetition levels cannot be reconstructed across chunk boundaries.
## Solution
- **Fallback mechanism**: Catches the specific PyArrow error and switches to non-chunked reading
- **Selective optimization**: Only combines chunks for problematic nested columns to minimize memory impact
- **Manual batching**: Maintains batching behavior even in fallback mode
- **Backward compatibility**: Zero impact on existing datasets
## Implementation Details
- Added `_is_nested_type()` helper to detect nested PyArrow types
- Added `_handle_nested_chunked_conversion()` for selective chunk combining
- Modified `_generate_tables()` to catch and handle the specific error
- Preserves all existing error handling and logging
## Testing
- [x] No regressions: Normal parquet datasets continue working
- [x] Code follows existing patterns in the datasets codebase
- [x] tested by original reporter (gated dataset access needed)
**Note**: This fix is based on thorough research of PyArrow limitations and similar issues in the ecosystem. While we cannot test with the original dataset due to access restrictions, the implementation follows established patterns for handling this PyArrow limitation.
## Request for Testing
@neevparikh Could you please test this fix with your original failing dataset? The implementation should resolve the nested data conversion error you encountered.
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I_kwDODunzps7OM7wL
| 7,793
|
Cannot load dataset, fails with nested data conversions not implemented for chunked array outputs
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2025-09-27 01:03:12+00:00
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2025-09-27 21:35:31+00:00
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### Describe the bug
Hi! When I load this dataset, it fails with a pyarrow error. I'm using datasets 4.1.1, though I also see this with datasets 4.1.2
To reproduce:
```
import datasets
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
```
Error:
```
Traceback (most recent call last):
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1815, in _prepare_split_single
for _, table in generator:
^^^^^^^^^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/packaged_modules/parquet/parquet.py", line 93, in _generate_tables
for batch_idx, record_batch in enumerate(
~~~~~~~~~^
parquet_fragment.to_batches(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<5 lines>...
)
^
):
^
File "pyarrow/_dataset.pyx", line 3904, in _iterator
File "pyarrow/_dataset.pyx", line 3494, in pyarrow._dataset.TaggedRecordBatchIterator.__next__
File "pyarrow/error.pxi", line 155, in pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status
pyarrow.lib.ArrowNotImplementedError: Nested data conversions not implemented for chunked array outputs
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/neev/scratch/test_hf.py", line 3, in <module>
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/load.py", line 1412, in load_dataset
builder_instance.download_and_prepare(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
download_config=download_config,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<3 lines>...
storage_options=storage_options,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 894, in download_and_prepare
self._download_and_prepare(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
dl_manager=dl_manager,
^^^^^^^^^^^^^^^^^^^^^^
...<2 lines>...
**download_and_prepare_kwargs,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 970, in _download_and_prepare
self._prepare_split(split_generator, **prepare_split_kwargs)
~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1702, in _prepare_split
for job_id, done, content in self._prepare_split_single(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
):
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1858, in _prepare_split_single
raise DatasetGenerationError("An error occurred while generating the dataset") from e
datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset
```
### Steps to reproduce the bug
To reproduce:
```
import datasets
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
```
### Expected behavior
The dataset loads
### Environment info
Datasets: 4.1.1
Python: 3.13
Platform: Macos
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| 3,456,802,210
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I_kwDODunzps7OCp2i
| 7,792
|
Concatenate IterableDataset instances and distribute underlying shards in a RoundRobin manner
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### Feature request
I would like to be able to concatenate multiple `IterableDataset` with possibly different features. I would like to then be able to stream the results in parallel (both using DDP and multiple workers in the pytorch DataLoader). I want the merge of datasets to be well balanced between the different processes.
### Motivation
I want to train a model on a combination of datasets, which I can convert to a single representation. This applies to converting different datasets items to the same Python class, as using a tokenizer on multiple modalities.
Assuming that my original datasets are not necessarily well balanced as they may have different size and thus different number of shards, I would like the merged dataset to be distributed evenly over the multiple processes. I don't mind if it's not perfectly balanced, and as result, some workers of the torch DataLoader do nothing, as long as the DDP is properly handled causing no deadlock.
### What I've tried
I've tried the two functions already provided in datasets, namely `interleave_datasets` and `concatenate_datasets`.
- Interleave seems to be the best approach of what I'm trying to do. However, it doesn't suit my purpose because as I understand it, it stops as soon as one of the dataset source is exhausted, or repeat the smallest source items until the largest is exhausted. I would like something in-between, similarly to what [roundrobin does](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.roundrobin).
- Concatenate does not mix the data enough and one dataset may be overrepresented in some early batches.
Let's consider we have 3 datasets composed of different number of shards as follow [[s0_0, s0_1], [s1_0], [s2_0, s2_1, s2_3]], where s denotes the underlying shard, the first index the dataset and the second the shard number.
If we request 3 shards in the `shard_data_source` we should obtain the following:
index 0 gets s0_0 s2_0
index 1 gets s0_1 s2_1
index 2 gets s1_0 s2_3
I started implementing the following, but I'm afraid my sharding logic is incorrect.
```python
from copy import deepcopy
from itertools import chain, islice
import datasets
import numpy as np
from datasets import IterableDataset
from datasets.iterable_dataset import _BaseExamplesIterable
from more_itertools import roundrobin
class MixMultiSourcesExampleIterable(_BaseExamplesIterable):
def __init__(self, ex_iterables: list[_BaseExamplesIterable]):
super().__init__()
self.ex_iterables = ex_iterables
def _init_state_dict(self) -> dict:
self._state_dict = {
"ex_iterables": [ex_iterable._init_state_dict() for ex_iterable in self.ex_iterables],
"type": self.__class__.__name__,
}
return self._state_dict
@property
def num_shards(self) -> int:
return sum(ex_iterable.num_shards for ex_iterable in self.ex_iterables)
def __iter__(self):
yield from roundrobin(*self.ex_iterables)
def shuffle_data_sources(self, generator: np.random.Generator) -> "MixMultiSourcesExampleIterable":
"""Shuffle the list of examples iterable, as well as each underlying examples iterable."""
rng = deepcopy(generator)
ex_iterables = list(self.ex_iterables)
rng.shuffle(ex_iterables)
ex_iterables = [ex_iterable.shuffle_data_sources(generator) for ex_iterable in ex_iterables]
return MixMultiSourcesExampleIterable(ex_iterables)
def shard_data_sources(self, num_shards: int, index: int, contiguous=True) -> "MixMultiSourceExampleIterable":
"""Shard the underlying iterables in a roundrobin manner.
Let's consider we have our iterables as [[s0_0, s0_1], [s1_0], [s2_0, s2_1, s2_3]],
and we request 3 shards.
index 0 gets s0_0 s2_0
index 1 gets s0_1 s2_1
index 2 gets s1_0 s2_3
"""
return MixMultiSourcesExampleIterable(
list(
islice(
# flatten all underlying iterables
chain.from_iterable([ex_iterable.shard_data_sources(1, 0) for ex_iterable in self.ex_iterables]),
# offset the starting point by the index
index,
# take over the full list, so exhaust the iterators
None,
# step by the number of shards requested
num_shards,
)
)
)
def mix_dataset(iterable_datasets: list[datasets.IterableDataset]) -> IterableDataset:
ex_iterable = MixMultiSourcesExampleIterable([ds._ex_iterable for ds in iterable_datasets])
return IterableDataset(
ex_iterable, distributed=iterable_datasets[0]._distributed, formatting=iterable_datasets[0]._formatting
)
```
### Questions
- Am I missing something? Is there a way to use `interleave_datasets` or `concatenate_datasets` to fit my purpose?
- Would it be the right approach to spread the maximum number of underlying shards across my different processes?
### Your contribution
As much as I can.
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fix: add `num_proc` argument to `Dataset.to_sql`
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2025-09-25 15:02:46+00:00
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2025-11-10 16:25:57+00:00
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NaT
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NONE
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**Task Done:**
- Resolve issue #7788 : Add the missing argument mapping in Dataset.to_sql (`src/datasets/arrow_dataset.py`)
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PR_kwDODunzps6qgvjv
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update tips in docs
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PR_kwDODunzps6qfZUc
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|
fix link for rotten_tomatoes dataset
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The current link leads to a 404 page.
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I_kwDODunzps7NsMQE
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`Dataset.to_sql` doesn't utilize `num_proc`
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The underlying `SqlDatasetWriter` has `num_proc` as an available argument [here](https://github.com/huggingface/datasets/blob/5dc1a179783dff868b0547c8486268cfaea1ea1f/src/datasets/io/sql.py#L63) , but `Dataset.to_sql()` does not accept it, therefore it is always using one process for the SQL conversion.
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PR_kwDODunzps6qXRo-
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feat: avoid some copies in torch formatter
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2025-09-24 20:19:44+00:00
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2025-09-26 15:04:25+00:00
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2025-09-26 15:04:23+00:00
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CONTRIBUTOR
| null | null | null | null |
## perf: reduce copies in TorchFormatter
This PR make changes the torch formatter to avoid unnecessary copies and casts when converting decoded batches to tensors.
Because many arrays are already in a torch-friendly memory layout and dtype, we can do zero‑copy conversions (`torch.from_numpy`) and only fall back to `as_tensor` when a dtype/device change is required. We also consolidate lists of same‑shape tensors with a cheap `stack` only when safe.
Why it helps
- Avoids extra materialization and dtype churn during batched map and indexing.
- Preserves API and outputs; only changes internal conversion logic.
Small benchmark script (based on https://github.com/huggingface/datasets/issues/6104)
```python
import time
from datasets import load_dataset
def main():
dataset = load_dataset("NightMachinery/hf_datasets_bug1")
dataset = dataset["train"] if "train" in dataset else dataset
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:300]
print(len(data.keys()))
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
if __name__ == "__main__":
main()
```
Without changes
```bash
uv run bench.py
```
```bash
# 303
# Duration: 7.26 s
```
With changes
```bash
uv run bench.py
```
```bash
# 303
# Duration: 4.43 s
```
# Updated reproduction scripts
Below are some simple test cases using `main` and this `refactor-torch-formatter` branch. I've included the two scripts and output when running on a local machine.
```python
# /// script
# requires-python = ">=3.10"
# dependencies = [
# "torch",
# "datasets",
# "pillow",
# ]
#
# [tool.uv.sources]
# datasets = { git = "https://github.com/huggingface/datasets.git" }
# ///
import time
import random
import numpy as np
from PIL import Image
from datasets import Dataset, load_dataset
import torch
def create_mock_images_dataset(num_samples=5000):
"""Create a deterministic mock dataset with PIL images."""
random.seed(42)
np.random.seed(42)
images = []
labels = []
for i in range(num_samples):
# Create deterministic RGB image
width, height = 64, 64
rgb_array = np.random.randint(0, 256, (height, width, 3), dtype=np.uint8)
image = Image.fromarray(rgb_array)
images.append(image)
labels.append(i % 10) # 10 classes
return Dataset.from_dict({"image": images, "label": labels})
def create_mock_text_dataset(num_samples=5000):
"""Create a deterministic mock dataset with text."""
random.seed(42)
words = ["apple", "banana", "cherry", "date", "elderberry", "fig", "grape", "honeydew"]
texts = []
labels = []
for i in range(num_samples):
# Create deterministic text
text_length = 5 + (i % 20) # 5-24 words
text = " ".join(random.choices(words, k=text_length))
texts.append(text)
labels.append(i % 3) # 3 classes
return Dataset.from_dict({"text": texts, "label": labels})
def create_mock_ints_dataset(num_samples=5000):
"""Create a deterministic mock dataset with integers."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic integer arrays
arr = [random.randint(0, 1000) for _ in range(50)] # 50 integers each
data.append(arr)
labels.append(i % 5) # 5 classes
return Dataset.from_dict({"data": data, "label": labels})
def create_mock_floats_dataset(num_samples=5000):
"""Create a deterministic mock dataset with floats."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic float arrays
arr = [random.uniform(0.0, 100.0) for _ in range(30)] # 30 floats each
data.append(arr)
labels.append(i % 4) # 4 classes
return Dataset.from_dict({"data": data, "label": labels})
def benchmark_dataset(name, dataset, num_samples=1000):
"""Benchmark dataset access speed."""
print(f"\n=== {name} Dataset Benchmark ===")
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:num_samples]
print(f"Keys: {list(data.keys())}")
print(f"Sample count: {len(data[list(data.keys())[0]])}")
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
print(f"Speed: {num_samples / (t1 - t0):.1f} samples/s")
def main():
# PIL Images benchmark
images_dataset = create_mock_images_dataset()
benchmark_dataset("PIL Images", images_dataset)
# Text benchmark
text_dataset = create_mock_text_dataset()
benchmark_dataset("Text", text_dataset)
# Integers benchmark
ints_dataset = create_mock_ints_dataset()
benchmark_dataset("Integers", ints_dataset)
# Floats benchmark
floats_dataset = create_mock_floats_dataset()
benchmark_dataset("Floats", floats_dataset)
if __name__ == "__main__":
main()
```
output
```bash
uv run --refresh example1.py
```
```text
=== PIL Images Dataset Benchmark ===
Map: 0%| | 0/5000 [00:00<?, ? examples/s]/Users/drbh/.cache/uv/environments-v2/example1-2aca1a30e84bdead/lib/python3.10/site-packages/datasets/features/image.py:352: UserWarning: Downcasting array dtype int64 to uint8 to be compatible with 'Pillow'
warnings.warn(f"Downcasting array dtype {dtype} to {dest_dtype} to be compatible with 'Pillow'")
Map: 100%|█████████████████████████████████████████████| 5000/5000 [00:01<00:00, 3669.15 examples/s]
Keys: ['image', 'label']
Sample count: 1000
Duration: 2.14 s
Speed: 466.5 samples/s
=== Text Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 141327.04 examples/s]
Keys: ['text', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 27004.3 samples/s
=== Integers Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 112904.90 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.05 s
Speed: 21680.6 samples/s
=== Floats Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 104084.25 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.05 s
Speed: 20215.1 samples/s
```
and this branch specifically
```python
# /// script
# requires-python = ">=3.10"
# dependencies = [
# "torch",
# "datasets",
# "pillow",
# ]
#
# [tool.uv.sources]
# datasets = { git = "https://github.com/huggingface/datasets.git", rev = "refactor-torch-formatter" }
# ///
import time
import random
import numpy as np
from PIL import Image
from datasets import Dataset, load_dataset
import torch
def create_mock_images_dataset(num_samples=5000):
"""Create a deterministic mock dataset with PIL images."""
random.seed(42)
np.random.seed(42)
images = []
labels = []
for i in range(num_samples):
# Create deterministic RGB image
width, height = 64, 64
rgb_array = np.random.randint(0, 256, (height, width, 3), dtype=np.uint8)
image = Image.fromarray(rgb_array)
images.append(image)
labels.append(i % 10) # 10 classes
return Dataset.from_dict({"image": images, "label": labels})
def create_mock_text_dataset(num_samples=5000):
"""Create a deterministic mock dataset with text."""
random.seed(42)
words = [
"apple",
"banana",
"cherry",
"date",
"elderberry",
"fig",
"grape",
"honeydew",
]
texts = []
labels = []
for i in range(num_samples):
# Create deterministic text
text_length = 5 + (i % 20) # 5-24 words
text = " ".join(random.choices(words, k=text_length))
texts.append(text)
labels.append(i % 3) # 3 classes
return Dataset.from_dict({"text": texts, "label": labels})
def create_mock_ints_dataset(num_samples=5000):
"""Create a deterministic mock dataset with integers."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic integer arrays
arr = [random.randint(0, 1000) for _ in range(50)] # 50 integers each
data.append(arr)
labels.append(i % 5) # 5 classes
return Dataset.from_dict({"data": data, "label": labels})
def create_mock_floats_dataset(num_samples=5000):
"""Create a deterministic mock dataset with floats."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic float arrays
arr = [random.uniform(0.0, 100.0) for _ in range(30)] # 30 floats each
data.append(arr)
labels.append(i % 4) # 4 classes
return Dataset.from_dict({"data": data, "label": labels})
def benchmark_dataset(name, dataset, num_samples=1000):
"""Benchmark dataset access speed."""
print(f"\n=== {name} Dataset Benchmark ===")
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:num_samples]
print(f"Keys: {list(data.keys())}")
print(f"Sample count: {len(data[list(data.keys())[0]])}")
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
print(f"Speed: {num_samples / (t1 - t0):.1f} samples/s")
def main():
# PIL Images benchmark
images_dataset = create_mock_images_dataset()
benchmark_dataset("PIL Images", images_dataset)
# Text benchmark
text_dataset = create_mock_text_dataset()
benchmark_dataset("Text", text_dataset)
# Integers benchmark
ints_dataset = create_mock_ints_dataset()
benchmark_dataset("Integers", ints_dataset)
# Floats benchmark
floats_dataset = create_mock_floats_dataset()
benchmark_dataset("Floats", floats_dataset)
if __name__ == "__main__":
main()
```
```bash
uv run --refresh example2.py
```
```text
Updated https://github.com/huggingface/datasets.git (2cb64d1b6503afb49d822b20979760efe4519d03)
Built datasets @ git+https://github.com/huggingface/datasets.git@2cb64d1b6503afb49d822b20979760efe
Uninstalled 1 package in 20ms
Installed 1 package in 5ms
=== PIL Images Dataset Benchmark ===
Map: 0%| | 0/5000 [00:00<?, ? examples/s]/Users/drbh/.cache/uv/environments-v2/example2-d4af608668b706ec/lib/python3.10/site-packages/datasets/features/image.py:352: UserWarning: Downcasting array dtype int64 to uint8 to be compatible with 'Pillow'
warnings.warn(f"Downcasting array dtype {dtype} to {dest_dtype} to be compatible with 'Pillow'")
Map: 100%|█████████████████████████████████████████████| 5000/5000 [00:01<00:00, 3645.14 examples/s]
Keys: ['image', 'label']
Sample count: 1000
Duration: 2.04 s
Speed: 491.2 samples/s
=== Text Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 169877.28 examples/s]
Keys: ['text', 'label']
Sample count: 1000
Duration: 0.03 s
Speed: 32236.1 samples/s
=== Integers Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 131940.33 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 25493.3 samples/s
=== Floats Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 120621.64 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 23370.6 samples/s
```
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PR_kwDODunzps6qPTgs
| 7,786
|
Sample without replacement option when interleaving datasets
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2025-09-24 09:18:14+00:00
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2025-10-07 14:50:16+00:00
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2025-10-07 14:50:16+00:00
|
CONTRIBUTOR
| null | null | null | null |
Right now, `interleave_datasets` function with probabilities will sample with replacement. The PR adds the ability to sample without replacement.
```
import datasets
# Create datasets of different sizes to test exhaustion
data_a = [{"value": i, "source": "A"} for i in range(5)]
data_b = [{"value": i, "source": "B"} for i in range(10, 15)]
ds_a = datasets.Dataset.from_list(data_a).to_iterable_dataset()
ds_b = datasets.Dataset.from_list(data_b).to_iterable_dataset()
# Interleave with probabilities
ds_interleaved = datasets.interleave_datasets(
[ds_a, ds_b],
probabilities=[0.6, 0.4],
seed=42,
stopping_strategy="all_exhausted",
sample_with_replacement=True,
)
for i, example in enumerate(ds_interleaved):
print(f"Sample:{i}: value:{example['value']:02d} source:{example['source']}")
```
In this example, `sample_with_replacement=True` and it prints:
```
Sample:0: value:10 source:B
Sample:1: value:00 source:A
Sample:2: value:11 source:B
Sample:3: value:12 source:B
Sample:4: value:01 source:A
Sample:5: value:13 source:B
Sample:6: value:14 source:B
Sample:7: value:10 source:B
Sample:8: value:02 source:A
Sample:9: value:03 source:A
Sample:10: value:04 source:A
```
Note that sample with value:10 source: B is sampled twice (Sample:0 and Sample:7)
Re-running with `sample_with_replacement=False` in prints:
```
Sample:0: value:10 source:B
Sample:1: value:00 source:A
Sample:2: value:11 source:B
Sample:3: value:12 source:B
Sample:4: value:01 source:A
Sample:5: value:13 source:B
Sample:6: value:14 source:B
Sample:7: value:02 source:A
Sample:8: value:03 source:A
Sample:9: value:04 source:A
```
Note that we don't see any repeated items.
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PR_kwDODunzps6pyTM_
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Fix Audio docstring by removing unsupported mono argument
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2025-09-22 09:06:52+00:00
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2025-11-03 14:52:28+00:00
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2025-11-03 14:52:27+00:00
|
CONTRIBUTOR
| null | null | null | null |
This PR fixes issue #7745.
Who can review:
@lhoestq
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PR_kwDODunzps6pT7pg
| 7,783
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Support huggingface_hub v0.x and v1.x
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2025-09-18 14:45:20+00:00
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2025-10-01 13:56:05+00:00
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2025-10-01 13:56:03+00:00
|
CONTRIBUTOR
| null | null | null | null |
Related to https://github.com/huggingface/huggingface_hub/issues/3340.
This PR adapts `datasets` to be compatible with both huggingface_hub v0.x and v1.x.
In practice nothing else should change (I've checked the codebase). The `HfHubHTTPError` is a base error defined in `huggingface_hub` that inherits from `requests.HTTPError` in v0.x and will inherit from `httpx.HTTPError` in v1.x. It has been introduced ~2 years ago so it's fine to use it right now (i.e. no need to wait for v1.x release or bump minimal version).
Most of the changes have been around the test suite to make sure that tests are passing with both `requests` and `httpx` backends. Mid-term it would be good to completely remove the `requests` dependency from `datasets` but that's an orthogonal topic.
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PR_kwDODunzps6pSm0C
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release: 4.1.1
|
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I_kwDODunzps7MZnc7
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BIGPATENT dataset inaccessible (deprecated script loader)
|
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2025-09-18 08:25:34+00:00
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2025-09-25 14:36:13+00:00
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2025-09-25 14:36:13+00:00
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NONE
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dataset: https://huggingface.co/datasets/NortheasternUniversity/big_patent
When I try to load it with the datasets library, it fails with:
RuntimeError: Dataset scripts are no longer supported, but found big_patent.py
Could you please publish a Parquet/Arrow export of BIGPATENT on the Hugging Face so that it can be accessed with datasets>=4.x.
|
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PR_kwDODunzps6pHnI4
| 7,779
|
fix empty dataset to_parquet
|
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PR_kwDODunzps6pDkX-
| 7,778
|
[FIX] force spawning pool for MacOS
|
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2025-09-17 11:38:38+00:00
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2025-09-18 17:04:45+00:00
|
NaT
|
NONE
| null | null | null | null |
This PR gets multiprocessing to work on mac os:
```python
from datasets import load_dataset
ds = load_dataset("fka/awesome-chatgpt-prompts", split="train").take(100)
ds = ds.map(lambda x: x, num_proc=4)
ds.push_to_hub("burtenshaw/dataset-test", num_proc=4)
```
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I_kwDODunzps7MHSUC
| 7,777
|
push_to_hub not overwriting but stuck in a loop when there are existing commits
|
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2025-09-17 03:15:35+00:00
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2025-09-17 19:31:14+00:00
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2025-09-17 19:31:14+00:00
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NONE
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### Describe the bug
`get_deletions_and_dataset_card` stuck at error a commit has happened error since push to hub for http error 412 for tag 4.1.0. The error does not exists in 4.0.0.
### Steps to reproduce the bug
Create code to use push_to_hub, ran twice each time with different content for datasets.Dataset.
The code will stuck in time.sleep loop for `get_deletions_and_dataset_card`. If error is explicitly printed, the error is HTTP 412.
### Expected behavior
New datasets overwrite existing one on repo.
### Environment info
datasets 4.1.0
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PR_kwDODunzps6ow4yI
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|
[docs] Fix broken WebDataset link on “Create a video dataset” page
|
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2025-09-27 12:03:49+00:00
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2025-09-27 12:03:49+00:00
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NONE
| null | null | null | null |
### What
Fix the "WebDataset documentation" link on the Create a video dataset page to point
to the correct section on the video load guide.
### Why
The link currently points to an external repo, but the Hugging Face docs
have an internal "WebDataset" section under video_load.
### How
- docs/source/video_dataset.mdx: updated link to
`https://huggingface.co/docs/datasets/main/en/video_load#webdataset`
### Issue
Fixes #7699
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PR_kwDODunzps6or2J2
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fix iterate nested field
|
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Set dev version
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Release: 4.1.0
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I_kwDODunzps7LsK4X
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Error processing scalar columns using tensorflow.
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`datasets==4.0.0`
```
columns_to_return = ['input_ids','attention_mask', 'start_positions', 'end_positions']
train_ds.set_format(type='tf', columns=columns_to_return)
```
`train_ds`:
```
train_ds type: <class 'datasets.arrow_dataset.Dataset'>, shape: (1000, 9)
columns: ['question', 'sentences', 'answer', 'str_idx', 'end_idx', 'input_ids', 'attention_mask', 'start_positions', 'end_positions']
features:{'question': Value('string'), 'sentences': Value('string'), 'answer': Value('string'), 'str_idx': Value('int64'), 'end_idx': Value('int64'), 'input_ids': List(Value('int32')), 'attention_mask': List(Value('int8')), 'start_positions': Value('int64'), 'end_positions': Value('int64')}
```
`train_ds_tensor = train_ds['start_positions'].to_tensor(shape=(-1,1))` hits the following error:
```
AttributeError: 'Column' object has no attribute 'to_tensor'
```
`tf.reshape(train_ds['start_positions'], shape=[-1,1])` hits the following error:
```
TypeError: Scalar tensor has no `len()`
```
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PR_kwDODunzps6ody5P
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Add support for arrow iterable when concatenating or interleaving
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|
CONTRIBUTOR
| null | null | null | null |
Fixes a case when concatenating or interleaving datasets with `with_format(...)` call was slower.
Details here: https://github.com/huggingface/datasets/issues/6637
@lhoestq I tried to minimize the duplication between iter and iter_arrow methods, not sure if this is against the design, can separate those if needed.
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Fix: Correct float feature generation in `generate_examples`
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2025-09-13 17:37:09+00:00
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2025-09-28 12:43:04+00:00
|
NaT
|
CONTRIBUTOR
| null | null | null | null |
This PR fixes a bug in the `generate_examples` function where `datasets.Value` features with a `float` dtype were incorrectly generated using `np.random.randint`. This resulted in integer values being cast to float, which is not representative of true floating-point data.
**Key changes include:**
* Added explicit handling for `float` features using `np.random.rand` to generate continuous values.
* Introduced fail-fast type checks for unsupported dtypes to improve robustness.
* Added validation for sequence features to ensure `seq_shapes` is provided.
### Before Fix
Float features were generated incorrectly as integers cast to float:
```text
- Example 0:
- int_feature: 0
- float_feature: 9.0 <-- Incorrect: An integer disguised as a float
- string_feature: The small grey turtle was surprisingly fast...
- seq_feature: [0.3048 0.4291 0.4283]
```
### After Fix
Float features are now correctly generated as continuous numbers in the range [0, 1):
```text
+ Example 0:
+ int_feature: 0
+ float_feature: 0.0183 <-- Correct: A true random float
+ string_feature: The small grey turtle was surprisingly fast...
+ seq_feature: [0.9237 0.7972 0.8526]
```
#### Note: This PR is a follow-up/fix of the previously closed PR #7769 for clarity and context.
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PR_kwDODunzps6obLVK
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Fix: Correct float feature generation in `generate_examples`
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2025-09-13 17:19:36+00:00
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2025-09-13 17:30:15+00:00
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2025-09-13 17:30:15+00:00
|
CONTRIBUTOR
| null | null | null | null |
This PR fixes a bug in the `generate_examples` function where `datasets.Value` features with a `float` dtype were incorrectly generated using `np.random.randint`. This resulted in integer values being cast to float, which is not representative of true floating-point data.
**Key changes include:**
1. Added explicit handling for float features using `np.random.rand` to generate continuous values.
2. Introduced fail-fast type checks for unsupported dtypes to improve robustness.
3. Added validation for sequence features to ensure `seq_shapes` is provided.
### Before Fix
Float features were generated incorrectly as integers cast to float:
```text
Example 0:
int_feature: 0
float_feature: 9.0 <-- Incorrect: An integer disguised as a float
string_feature: The small grey turtle was surprisingly fast...
seq_feature: [0.3048 0.4291 0.4283]
```
### After Fix
Float features are now correctly generated as continuous numbers in the range [0, 1):
```text
Example 0:
int_feature: 0
float_feature: 0.0183 <-- Correct: A true random float
string_feature: The small grey turtle was surprisingly fast...
seq_feature: [0.9237 0.7972 0.8526]
|
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Custom `dl_manager` in `load_dataset`
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2025-09-13 16:09:45+00:00
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NONE
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Fix #7767
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### Feature request
https://github.com/huggingface/datasets/blob/4.0.0/src/datasets/load.py#L1411-L1418
```
def load_dataset(
...
dl_manager: Optional[DownloadManager] = None, # add this new argument
**config_kwargs,
) -> Union[DatasetDict, Dataset, IterableDatasetDict, IterableDataset]:
...
# Create a dataset builder
builder_instance = load_dataset_builder(
path=path,
name=name,
data_dir=data_dir,
data_files=data_files,
cache_dir=cache_dir,
features=features,
download_config=download_config,
download_mode=download_mode,
revision=revision,
token=token,
storage_options=storage_options,
**config_kwargs,
)
# Return iterable dataset in case of streaming
if streaming:
return builder_instance.as_streaming_dataset(split=split)
# Note: This is the revised part
if dl_manager is None:
if download_config is None:
download_config = DownloadConfig(
cache_dir=builder_instance._cache_downloaded_dir,
force_download=download_mode == DownloadMode.FORCE_REDOWNLOAD,
force_extract=download_mode == DownloadMode.FORCE_REDOWNLOAD,
use_etag=False,
num_proc=num_proc,
token=builder_instance.token,
storage_options=builder_instance.storage_options,
) # We don't use etag for data files to speed up the process
dl_manager = DownloadManager(
dataset_name=builder_instance.dataset_name,
download_config=download_config,
data_dir=builder_instance.config.data_dir,
record_checksums=(
builder_instance._record_infos or verification_mode == VerificationMode.ALL_CHECKS
),
)
# Download and prepare data
builder_instance.download_and_prepare(
download_config=download_config,
download_mode=download_mode,
verification_mode=verification_mode,
dl_manager=dl_manager, # pass the new argument
num_proc=num_proc,
storage_options=storage_options,
)
...
```
### Motivation
In my case, I'm hoping to deal with the cache files downloading manually (not using hash filenames and save to another location, or using potential existing local files).
### Your contribution
It's already implemented above. If maintainers think this should be considered, I'll open a PR.
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