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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 06:38:19+00:00
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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
|
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
| 7,822
|
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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