# Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import annotations

import copy
import json
import os
import re
import warnings
from typing import Any, Dict, List, Optional, Tuple, Union

import paddle

from ......utils import logging
from ..utils import CONFIG_NAME, LEGACY_CONFIG_NAME, resolve_file_path

_re_configuration_file = re.compile(r"config\.(.*)\.json")


def attribute_map(config: PretrainedConfig, kwargs: Dict[str, Any]) -> Dict[str, Any]:
    """map the <old-attr> to <new-attr> with configuration

    Args:
        config (PretrainedConfig): the instance of PretrainedConfig
        kwargs (Dict[str, Any]): the kwargs of attribute
    """
    for old_key, new_key in config.attribute_map.items():
        if old_key in kwargs:
            if new_key in kwargs:
                logging.warning(
                    f"receive param<{old_key}> and param<{new_key}>, but the first one will be adopt"
                )
            kwargs[new_key] = kwargs.pop(old_key)
    return kwargs


def convert_to_legacy_config(
    attribute_map: Dict[str, str], config: Dict[str, Any]
) -> Dict[str, Any]:
    """
    works when there are different fields between huggingface and paddle
    Args:
        attribute_map (Dict[str, str]): mapping of between standard config and paddle config
        config (Dict[str, Any]): config of huggingface transformers models
    Returns: the config which can be mapped into config of paddle model
    """
    if "init_args" in config:
        args = []
        for init_arg in config["init_args"]:
            init_arg = convert_to_legacy_config(attribute_map, init_arg)
            args.append(init_arg)
        config["init_args"] = args

    # TODO(wj-Mcat): to improve compatibility for: old local config and new PretrainedConfig, eg:
    # { "init_args": [], "init_class": "", "num_classes": 12 }
    for standard_field, paddle_field in attribute_map.items():
        value = config.pop(standard_field, None) or config.pop(paddle_field, None)
        if value is not None:
            config[paddle_field] = value
    return config


def flatten_model_config(config: dict) -> dict:
    """flatten the model config which can be old-style model config

    Args:
        config (dict): the source of config which can be flatten config or nest config

    Returns:
        dict: the flatten config
    """
    # 1. extract the init_args into the top level
    init_args = config.pop("init_args", [])

    index = 0
    while index < len(init_args):
        if isinstance(init_args[index], dict):
            for key, value in init_args[index].items():
                if key not in config:
                    config[key] = value
            init_args.pop(index)
        else:
            index += 1

    if init_args:
        config["init_args"] = init_args

    # 2. convert `init_class` into `architectures`
    if "init_class" in config:
        config["architectures"] = [config.pop("init_class")]

    return config


def set_expected_keys(config, llm_meta, kwargs):
    for key, value in llm_meta.items():
        if key in kwargs:
            value = kwargs.pop(key)
        setattr(config, key, value)

    return kwargs


class LlmMetaConfig:
    op_fusion_attributes = [
        # name, type, default_value, comment
        (
            "use_flash_attention",
            bool,
            False,
            "Whether to use flash attention to accelerate training.",
        ),
        ("use_fused_rms_norm", bool, False, "llama or other model, use_fused_rms_norm"),
        ("use_fused_rope", bool, False, "Enable rope fusion or not."),
        ("use_fused_linear", bool, False, "GPT3 model, use fused linear layer"),
        (
            "use_fused_dropout_add",
            bool,
            False,
            "GPT3 model, use fused `dropout + residual add` op.",
        ),
        (
            "use_fused_linear_cross_entropy",
            bool,
            False,
            "use fused `linear + cross_entropy` fuse op.",
        ),
    ]

    hybrid_parallel_attributes = [
        # tensor_parallel
        ("tensor_parallel_degree", int, 1, "tensor_parallel_degree"),
        ("tensor_parallel_rank", int, 0, "tensor_parallel_rank"),
        ("tensor_parallel_output", bool, True, "tensor_parallel_output"),
        # pipeline_parallel
        ("pipeline_parallel_degree", int, 1, "pipeline_parallel_degree"),
        ("virtual_pp_degree", int, 1, "Virtual pipeline degree"),
        # pp refine recompute
        ("no_recompute_layers", Optional[List[int]], None, "no_recompute_layers"),
        (
            "pp_recompute_interval",
            int,
            1,
            "The interval for the number of layers at which recomputation occurs. A value of 0 indicates no recomputation. Default is 0.",
        ),
        # sep_parallel
        ("sep_parallel_degree", int, 1, "sep_parallel_degree"),
        ("context_parallel_degree", int, 1, "context_parallel_degree"),
        ("sequence_parallel", bool, False, "Whether to use sequence parallel"),
        (
            "fuse_sequence_parallel_allreduce",
            bool,
            False,
            "Whether to use fuse sequence parallel allreduce",
        ),
    ]
    recompute_attributes = [
        ("recompute", bool, False, "recompute"),
        (
            "recompute_granularity",
            str,
            "full",
            "Recompute granularity, Choose among ['full', 'core_attn', 'full_attn']",
        ),
        ("recompute_use_reentrant", bool, False, "recompute_use_reentrant"),
        # refined_recompute attributes
        (
            "refined_recompute",
            str,
            "",
            "refined_recompute, Choose from 'mlp_row_ln', 'mlp_column_ln', 'attention_row_ln', 'attention_column_ln', 'flash_attn']",
        ),
        ("offload_recompute_inputs", bool, False, "offload_recompute_inputs"),
    ]

    @classmethod
    def _get_defaults(cls):
        ret = {}
        for attrs in [
            cls.op_fusion_attributes,
            cls.hybrid_parallel_attributes,
            cls.recompute_attributes,
        ]:
            for attr in attrs:
                # return dict of key and default values
                ret[attr[0]] = attr[2]
        return ret

    @classmethod
    def _get_all_meta(cls):
        ret = []
        for attrs in [
            cls.op_fusion_attributes,
            cls.hybrid_parallel_attributes,
            cls.recompute_attributes,
        ]:
            for attr in attrs:
                # return dict of key and default values
                ret.append(attr)
        return ret

    @classmethod
    def _get_unsavable_keys(cls):
        ret = set()
        for attrs in [
            cls.op_fusion_attributes,
            cls.hybrid_parallel_attributes,
            cls.recompute_attributes,
        ]:
            for attr in attrs:
                ret.add(attr[0])
        return ret

    @classmethod
    def set_llm_config(cls, config, args):
        for key, value in cls._get_defaults().items():
            setattr(config, key, getattr(args, key, value))


class PretrainedConfig:
    r"""
    Base class for all configuration classes. Handles a few parameters common to all models' configurations as well as
    methods for loading/downloading/saving configurations.

    <Tip>

    A configuration file can be loaded and saved to disk. Loading the configuration file and using this file to
    initialize a model does **not** load the model weights. It only affects the model's configuration.

    </Tip>

    Class attributes (overridden by derived classes):

    - **model_type** (`str`) -- An identifier for the model type, serialized into the JSON file, and used to recreate
        the correct object in [`~paddlenlp.AutoConfig`].
    - **is_composition** (`bool`) -- Whether the config class is composed of multiple sub-configs. In this case the
        config has to be initialized from two or more configs of type [`~paddlenlp.PretrainedConfig`] like:
        [`~paddlenlp.EncoderDecoderConfig`] or [`~RagConfig`].
    - **keys_to_ignore_at_inference** (`List[str]`) -- A list of keys to ignore by default when looking at dictionary
        outputs of the model during inference.
    - **attribute_map** (`Dict[str, str]`) -- A dict that maps model specific attribute names to the standardized
        naming of attributes.

    Common attributes (present in all subclasses):

    - **vocab_size** (`int`) -- The number of tokens in the vocabulary, which is also the first dimension of the
        embeddings matrix (this attribute may be missing for models that don't have a text modality like ViT).
    - **hidden_size** (`int`) -- The hidden size of the model.
    - **num_attention_heads** (`int`) -- The number of attention heads used in the multi-head attention layers of the
        model.
    - **num_hidden_layers** (`int`) -- The number of blocks in the model.

    Arg:
        name_or_path (`str`, *optional*, defaults to `""`):
            Store the string that was passed to [`PreTrainedModel.from_pretrained`] or
            [`PreTrainedModel.from_pretrained`] as `pretrained_model_name_or_path` if the configuration was created
            with such a method.
        output_hidden_states (`bool`, *optional*, defaults to `False`):
            Whether or not the model should return all hidden-states.
        output_attentions (`bool`, *optional*, defaults to `False`):
            Whether or not the model should returns all attentions.
        return_dict (`bool`, *optional*, defaults to `True`):
            Whether or not the model should return a [`~paddlenlp.transformers.model_outputs.ModelOutput`] instead of a plain tuple.
        is_encoder_decoder (`bool`, *optional*, defaults to `False`):
            Whether the model is used as an encoder/decoder or not.
        is_decoder (`bool`, *optional*, defaults to `False`):
            Whether the model is used as decoder or not (in which case it's used as an encoder).
        cross_attention_hidden_size** (`bool`, *optional*):
            The hidden size of the cross-attention layer in case the model is used as a decoder in an encoder-decoder
            setting and the cross-attention hidden dimension differs from `self.config.hidden_size`.
        add_cross_attention (`bool`, *optional*, defaults to `False`):
            Whether cross-attention layers should be added to the model. Note, this option is only relevant for models
            that can be used as decoder models within the [`EncoderDecoderModel`] class, which consists of all models
            in `AUTO_MODELS_FOR_CAUSAL_LM`.
        tie_encoder_decoder (`bool`, *optional*, defaults to `False`):
            Whether all encoder weights should be tied to their equivalent decoder weights. This requires the encoder
            and decoder model to have the exact same parameter names.
        prune_heads (`Dict[int, List[int]]`, *optional*, defaults to `{}`):
            Pruned heads of the model. The keys are the selected layer indices and the associated values, the list of
            heads to prune in said layer.

            For instance `{1: [0, 2], 2: [2, 3]}` will prune heads 0 and 2 on layer 1 and heads 2 and 3 on layer 2.
        chunk_size_feed_forward (`int`, *optional*, defaults to `0`):
            The chunk size of all feed forward layers in the residual attention blocks. A chunk size of `0` means that
            the feed forward layer is not chunked. A chunk size of n means that the feed forward layer processes `n` <
            sequence_length embeddings at a time. For more information on feed forward chunking, see [How does Feed
            Forward Chunking work?](../glossary.html#feed-forward-chunking).

        > Parameters for sequence generation

        max_length (`int`, *optional*, defaults to 20):
            Maximum length that will be used by default in the `generate` method of the model.
        min_length (`int`, *optional*, defaults to 10):
            Minimum length that will be used by default in the `generate` method of the model.
        do_sample (`bool`, *optional*, defaults to `False`):
            Flag that will be used by default in the `generate` method of the model. Whether or not to use sampling ;
            use greedy decoding otherwise.
        early_stopping (`bool`, *optional*, defaults to `False`):
            Flag that will be used by default in the `generate` method of the model. Whether to stop the beam search
            when at least `num_beams` sentences are finished per batch or not.
        num_beams (`int`, *optional*, defaults to 1):
            Number of beams for beam search that will be used by default in the `generate` method of the model. 1 means
            no beam search.
        num_beam_groups (`int`, *optional*, defaults to 1):
            Number of groups to divide `num_beams` into in order to ensure diversity among different groups of beams
            that will be used by default in the `generate` method of the model. 1 means no group beam search.
        diversity_penalty (`float`, *optional*, defaults to 0.0):
            Value to control diversity for group beam search. that will be used by default in the `generate` method of
            the model. 0 means no diversity penalty. The higher the penalty, the more diverse are the outputs.
        temperature (`float`, *optional*, defaults to 1):
            The value used to module the next token probabilities that will be used by default in the `generate` method
            of the model. Must be strictly positive.
        top_k (`int`, *optional*, defaults to 50):
            Number of highest probability vocabulary tokens to keep for top-k-filtering that will be used by default in
            the `generate` method of the model.
        top_p (`float`, *optional*, defaults to 1):
            Value that will be used by default in the `generate` method of the model for `top_p`. If set to float < 1,
            only the most probable tokens with probabilities that add up to `top_p` or higher are kept for generation.
        repetition_penalty (`float`, *optional*, defaults to 1):
            Parameter for repetition penalty that will be used by default in the `generate` method of the model. 1.0
            means no penalty.
        length_penalty (`float`, *optional*, defaults to 1):
            Exponential penalty to the length that will be used by default in the `generate` method of the model.
        no_repeat_ngram_size (`int`, *optional*, defaults to 0) -- Value that will be used by default in the
            `generate` method of the model for `no_repeat_ngram_size`. If set to int > 0, all ngrams of that size can
            only occur once.
        encoder_no_repeat_ngram_size (`int`, *optional*, defaults to 0) -- Value that will be used by
            default in the `generate` method of the model for `encoder_no_repeat_ngram_size`. If set to int > 0, all
            ngrams of that size that occur in the `encoder_input_ids` cannot occur in the `decoder_input_ids`.
        bad_words_ids (`List[int]`, *optional*):
            List of token ids that are not allowed to be generated that will be used by default in the `generate`
            method of the model. In order to get the tokens of the words that should not appear in the generated text,
            use `tokenizer.encode(bad_word, add_prefix_space=True)`.
        num_return_sequences (`int`, *optional*, defaults to 1):
            Number of independently computed returned sequences for each element in the batch that will be used by
            default in the `generate` method of the model.
        output_scores (`bool`, *optional*, defaults to `False`):
            Whether the model should return the logits when used for generation.
        return_dict_in_generate (`bool`, *optional*, defaults to `False`):
            Whether the model should return a [`~paddlenlp.transformers.model_outputs.ModelOutput`] instead of a `paddlenlp.Tensor`.
        forced_bos_token_id (`int`, *optional*):
            The id of the token to force as the first generated token after the `decoder_start_token_id`. Useful for
            multilingual models like [mBART](../model_doc/mbart) where the first generated token needs to be the target
            language token.
        forced_eos_token_id (`int`, *optional*):
            The id of the token to force as the last generated token when `max_length` is reached.
        remove_invalid_values (`bool`, *optional*):
            Whether to remove possible _nan_ and _inf_ outputs of the model to prevent the generation method to crash.
            Note that using `remove_invalid_values` can slow down generation.

        > Parameters for fine-tuning tasks

        architectures (`List[str]`, *optional*):
            Model architectures that can be used with the model pretrained weights.
        finetuning_task (`str`, *optional*):
            Name of the task used to fine-tune the model. This can be used when converting from an original checkpoint.
        id2label (`Dict[int, str]`, *optional*):
            A map from index (for instance prediction index, or target index) to label.
        label2id (`Dict[str, int]`, *optional*): A map from label to index for the model.
        num_labels (`int`, *optional*):
            Number of labels to use in the last layer added to the model, typically for a classification task.
        task_specific_params (`Dict[str, Any]`, *optional*):
            Additional keyword arguments to store for the current task.
        problem_type (`str`, *optional*):
            Problem type for `XxxForSequenceClassification` models. Can be one of `"regression"`,
            `"single_label_classification"` or `"multi_label_classification"`.

        > Parameters linked to the tokenizer

        tokenizer_class (`str`, *optional*):
            The name of the associated tokenizer class to use (if none is set, will use the tokenizer associated to the
            model by default).
        prefix (`str`, *optional*):
            A specific prompt that should be added at the beginning of each text before calling the model.
        bos_token_id (`int`, *optional*): The id of the _beginning-of-stream_ token.
        pad_token_id (`int`, *optional*): The id of the _padding_ token.
        eos_token_id (`int`, *optional*): The id of the _end-of-stream_ token.
        decoder_start_token_id (`int`, *optional*):
            If an encoder-decoder model starts decoding with a different token than _bos_, the id of that token.
        sep_token_id (`int`, *optional*): The id of the _separation_ token.

        tie_word_embeddings (`bool`, *optional*, defaults to `True`):
            Whether the model's input and output word embeddings should be tied. Note that this is only relevant if the
            model has a output word embedding layer.
        dtype (`str`, *optional*):
            The `dtype` of the weights. This attribute can be used to initialize the model to a non-default `dtype`
            (which is normally `float32`) and thus allow for optimal storage allocation. For example, if the saved
            model is `float16`, ideally we want to load it back using the minimal amount of memory needed to load
            `float16` weights. Since the config object is stored in plain text, this attribute contains just the
            floating type string without the `paddle.` prefix. For example, for `paddle.float16` ``dtype` is the
            `"float16"` string.

            This attribute is currently not being used during model loading time, but this may change in the future
            versions. But we can already start preparing for the future by saving the dtype with save_pretrained.
    """

    model_type: str = ""
    is_composition: bool = False

    pretrained_init_configuration = {}

    # global attribute mapping
    attribute_map: Dict[str, str] = {"num_classes": "num_labels"}

    _auto_class: Optional[str] = None

    # Fix me, it is global for all config
    _unsavable_keys = set()

    def __setattr__(self, key, value):
        if key in super().__getattribute__("attribute_map"):
            key = super().__getattribute__("attribute_map")[key]
        super().__setattr__(key, value)
        assert hasattr(self, key)

    def __getattribute__(self, key):
        if key != "attribute_map" and key in super().__getattribute__("attribute_map"):
            key = super().__getattribute__("attribute_map")[key]
        return super().__getattribute__(key)

    def __getitem__(self, key):
        return getattr(self, key, None)

    def __setitem__(self, key, value):
        if hasattr(self, key):
            setattr(self, key, value)

    def __init__(self, **kwargs):
        # Attributes with defaults
        # map the old attr to new atr, eg: num_classes -> num_labels
        kwargs = attribute_map(self, kwargs=kwargs)
        kwargs.pop("transformers_version", None)
        llm_meta = LlmMetaConfig._get_defaults()
        self._unsavable_keys.update(LlmMetaConfig._get_unsavable_keys())
        self._unsavable_keys.remove("tensor_parallel_degree")

        kwargs = set_expected_keys(self, llm_meta, kwargs)
        if self.sequence_parallel:
            assert (
                self.tensor_parallel_degree > 1
            ), f"senquence-parallel only works in tensor parallel, got tensor parallel degree={self.tensor_parallel_degree}"

        self.chunk_size_feed_forward = kwargs.pop("chunk_size_feed_forward", 0)
        self.return_dict = kwargs.pop("return_dict", False)
        self.output_hidden_states = kwargs.pop("output_hidden_states", False)
        self.output_attentions = kwargs.pop("output_attentions", False)
        self.use_cache = kwargs.pop("use_cache", False)

        # for transformers fuse
        self.fuse_attention_qkv = kwargs.pop("fuse_attention_qkv", False)
        self.fuse_attention_ffn = kwargs.pop("fuse_attention_ffn", False)

        self.pruned_heads = kwargs.pop("pruned_heads", {})
        self.tie_word_embeddings = kwargs.pop(
            "tie_word_embeddings", True
        )  # Whether input and output word embeddings should be tied for all MLM, LM and Seq2Seq models.

        # parameter for model dtype
        if "torch_dtype" in kwargs:
            self.dtype = kwargs.pop("torch_dtype")
        else:
            self.dtype = kwargs.pop("dtype", paddle.get_default_dtype())

        # Is decoder is used in encoder-decoder models to differentiate encoder from decoder
        self.is_encoder_decoder = kwargs.pop("is_encoder_decoder", False)
        self.is_decoder = kwargs.pop("is_decoder", False)
        self.cross_attention_hidden_size = kwargs.pop(
            "cross_attention_hidden_size", None
        )
        self.add_cross_attention = kwargs.pop("add_cross_attention", False)
        self.tie_encoder_decoder = kwargs.pop("tie_encoder_decoder", False)

        # Retrocompatibility: Parameters for sequence generation. While we will keep the ability to load these
        # parameters, saving them will be deprecated. In a distant future, we won't need to load them.
        for parameter_name, default_value in self._get_generation_defaults().items():
            setattr(self, parameter_name, kwargs.pop(parameter_name, default_value))

        # Fine-tuning task arguments
        self.architectures = kwargs.pop("architectures", None)
        self.finetuning_task = kwargs.pop("finetuning_task", None)
        self.id2label = kwargs.pop("id2label", None)
        self.label2id = kwargs.pop("label2id", None)
        if self.id2label is not None:
            num_labels = kwargs.pop("num_labels", None)
            if num_labels is not None and len(self.id2label) != num_labels:
                logging.warning(
                    f"You passed along `num_labels={num_labels}` with an incompatible id to label map: "
                    f"{self.id2label}. The number of labels will be overwritten to {self.num_labels}."
                )
            self.id2label = dict(
                (int(key), value) for key, value in self.id2label.items()
            )
            # Keys are always strings in JSON so convert ids to int here.
        else:
            self.num_labels = kwargs.pop("num_labels", 2)
        self.num_choices = kwargs.pop("num_choices", None)

        self.classifier_dropout = kwargs.pop("classifier_dropout", None)

        # Tokenizer arguments TODO: eventually tokenizer and models should share the same config
        self.tokenizer_class = kwargs.pop("tokenizer_class", None)
        self.prefix = kwargs.pop("prefix", None)
        self.bos_token_id = kwargs.pop("bos_token_id", None)
        self.pad_token_id = kwargs.pop("pad_token_id", None)
        self.eos_token_id = kwargs.pop("eos_token_id", None)
        self.sep_token_id = kwargs.pop("sep_token_id", None)

        self.decoder_start_token_id = kwargs.pop("decoder_start_token_id", None)

        # task specific arguments
        self.task_specific_params = kwargs.pop("task_specific_params", None)

        # regression / multi-label classification
        self.problem_type = kwargs.pop("problem_type", None)
        allowed_problem_types = (
            "regression",
            "single_label_classification",
            "multi_label_classification",
        )
        if (
            self.problem_type is not None
            and self.problem_type not in allowed_problem_types
        ):
            raise ValueError(
                f"The config parameter `problem_type` was not understood: received {self.problem_type} "
                "but only 'regression', 'single_label_classification' and 'multi_label_classification' are valid."
            )

        # Name or path to the pretrained checkpoint
        self._name_or_path = str(kwargs.pop("name_or_path", ""))

        # Drop the transformers version info
        self.paddlenlp_version = kwargs.pop("paddlenlp_version", None)

        # Deal with gradient checkpointing
        if kwargs.get("gradient_checkpointing", False):
            warnings.warn(
                "Passing `gradient_checkpointing` to a config initialization is deprecated and will be removed in v5 "
                "Transformers. Using `model.gradient_checkpointing_enable()` instead, or if you are using the "
                "`Trainer` API, pass `gradient_checkpointing=True` in your `TrainingArguments`."
            )

        # Additional attributes without default values
        for key, value in kwargs.items():
            try:
                setattr(self, key, value)
            except AttributeError as err:
                logging.error(f"Can't set {key} with value {value} for {self}")
                raise err

    @staticmethod
    def _get_generation_defaults() -> Dict[str, Any]:
        return {
            "max_length": 20,
            "min_length": 0,
            "do_sample": False,
            "early_stopping": False,
            "num_beams": 1,
            "num_beam_groups": 1,
            "diversity_penalty": 0.0,
            "temperature": 1.0,
            "top_k": 50,
            "top_p": 1.0,
            "typical_p": 1.0,
            "repetition_penalty": 1.0,
            "length_penalty": 1.0,
            "no_repeat_ngram_size": 0,
            "encoder_no_repeat_ngram_size": 0,
            "bad_words_ids": None,
            "num_return_sequences": 1,
            "output_scores": False,
            "return_dict_in_generate": False,
            "forced_bos_token_id": None,
            "forced_eos_token_id": None,
            "remove_invalid_values": False,
            "exponential_decay_length_penalty": None,
            "suppress_tokens": None,
            "begin_suppress_tokens": None,
        }

    def _has_non_default_generation_parameters(self) -> bool:
        """
        Whether or not this instance holds non-default generation parameters.
        """
        for parameter_name, default_value in self._get_generation_defaults().items():
            if (
                hasattr(self, parameter_name)
                and getattr(self, parameter_name) != default_value
            ):
                return True
        return False

    @property
    def name_or_path(self) -> str:
        return getattr(self, "_name_or_path", None)

    @name_or_path.setter
    def name_or_path(self, value):
        self._name_or_path = str(
            value
        )  # Make sure that name_or_path is a string (for JSON encoding)

    @property
    def use_return_dict(self) -> bool:
        """
        `bool`: Whether or not return [`~paddlenlp.transformers.model_outputs.ModelOutput`] instead of tuples.
        """
        return self.return_dict

    @property
    def num_labels(self) -> int:
        """
        `int`: The number of labels for classification models.
        """
        return len(self.id2label)

    @num_labels.setter
    def num_labels(self, num_labels: int):
        if (
            not hasattr(self, "id2label")
            or self.id2label is None
            or len(self.id2label) != num_labels
        ):
            self.id2label = {i: f"LABEL_{i}" for i in range(num_labels)}
            self.label2id = dict(zip(self.id2label.values(), self.id2label.keys()))

    @classmethod
    def from_pretrained(
        cls, pretrained_model_name_or_path: Union[str, os.PathLike], **kwargs
    ) -> PretrainedConfig:
        r"""
        Instantiate a [`PretrainedConfig`] (or a derived class) from a pretrained model configuration.

        Args:
            pretrained_model_name_or_path (`str` or `os.PathLike`):
                This can be either:

                - a string, the *model id* of a pretrained model configuration hosted inside a model repo on
                    paddlenlp bos server. Valid model ids can be located at the root-level, like `bert-base-uncased`, or
                    namespaced under a user or organization name, like `dbmdz/bert-base-german-cased`.
                - a path to a *directory* containing a configuration file saved using the
                    [`~PretrainedConfig.save_pretrained`] method, e.g., `./my_model_directory/`.
                - a path or url to a saved configuration JSON *file*, e.g., `./my_model_directory/configuration.json`.
            kwargs (`Dict[str, Any]`, *optional*):
                The values in kwargs of any keys which are configuration attributes will be used to override the loaded
                values. Behavior concerning key/value pairs whose keys are *not* configuration attributes is controlled
                by the `return_unused_kwargs` keyword parameter.

        <Tip>

        Passing `use_auth_token=True` is required when you want to use a private model.

        </Tip>

        Returns:
            [`PretrainedConfig`]: The configuration object instantiated from this pretrained model.
        """
        config_dict, kwargs = cls.get_config_dict(
            pretrained_model_name_or_path, **kwargs
        )

        return cls.from_dict(config_dict, **kwargs)

    @classmethod
    def get_config_dict(
        cls, pretrained_model_name_or_path: Union[str, os.PathLike], **kwargs
    ) -> Tuple[Dict[str, Any], Dict[str, Any]]:
        """
        From a `pretrained_model_name_or_path`, resolve to a dictionary of parameters, to be used for instantiating a
        [`PretrainedConfig`] using `from_dict`.

        Parameters:
            pretrained_model_name_or_path (`str` or `os.PathLike`):
                The identifier of the pre-trained checkpoint from which we want the dictionary of parameters.

        Returns:
            `Tuple[Dict, Dict]`: The dictionary(ies) that will be used to instantiate the configuration object.

        """
        original_kwargs = copy.deepcopy(kwargs)
        cache_dir = kwargs.pop("cache_dir", None)
        subfolder = kwargs.get("subfolder", "")
        if subfolder is None:
            subfolder = ""

        kwargs["cache_dir"] = cache_dir
        kwargs["subfolder"] = subfolder

        # Get config dict associated with the base config file
        config_dict, kwargs = cls._get_config_dict(
