#!/usr/bin/env python

# Copyright 2023 The HuggingFace Inc. team. All rights reserved.
# Modifications Copyright (C) 2025, Advanced Micro Devices, Inc. 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.
import copy
import dataclasses
import importlib.metadata
import json
import os
from dataclasses import dataclass, is_dataclass
from enum import Enum
from inspect import Parameter, signature
from typing import Any, Optional, Union

from packaging import version

from ..utils import (
    is_compressed_tensors_available,
    is_hqq_available,
    is_quark_available,
    is_torch_available,
    is_torchao_available,
    logging,
)


if is_torch_available():
    import torch

logger = logging.get_logger(__name__)


class QuantizationMethod(str, Enum):
    BITS_AND_BYTES = "bitsandbytes"
    GPTQ = "gptq"
    AWQ = "awq"
    AQLM = "aqlm"
    VPTQ = "vptq"
    QUANTO = "quanto"
    EETQ = "eetq"
    HIGGS = "higgs"
    HQQ = "hqq"
    COMPRESSED_TENSORS = "compressed-tensors"
    FBGEMM_FP8 = "fbgemm_fp8"
    TORCHAO = "torchao"
    BITNET = "bitnet"
    SPQR = "spqr"
    FP8 = "fp8"
    QUARK = "quark"
    FPQUANT = "fp_quant"
    AUTOROUND = "auto-round"
    MXFP4 = "mxfp4"
    METAL = "metal"
    FOUR_OVER_SIX = "fouroversix"
    SINQ = "sinq"


class AwqFormat(str, Enum):
    GEMM = "gemm"
    GEMV = "gemv"
    GEMV_FAST = "gemv_fast"
    LLM_AWQ = "llm-awq"


class AwqBackend(str, Enum):
    LEGACY_AWQ = "autoawq"
    AUTO = "auto"
    AUTO_TRAINABLE = "auto_trainable"
    MACHETE = "machete"
    MARLIN = "marlin"
    EXLLAMA_V2 = "exllama_v2"
    EXLLAMA_V1 = "exllama_v1"
    GEMM = "gemm"
    GEMM_TRITON = "gemm_triton"
    GEMV = "gemv"
    GEMV_FAST = "gemv_fast"
    TORCH_AWQ = "torch_awq"
    TORCH_FUSED_AWQ = "torch_fused_awq"


@dataclass
class QuantizationConfigMixin:
    """
    Mixin class for quantization config
    """

    quant_method: QuantizationMethod

    @classmethod
    def from_dict(cls, config_dict, return_unused_kwargs=False, **kwargs):
        """
        Instantiates a [`QuantizationConfigMixin`] from a Python dictionary of parameters.

        Args:
            config_dict (`dict[str, Any]`):
                Dictionary that will be used to instantiate the configuration object.
            return_unused_kwargs (`bool`,*optional*, defaults to `False`):
                Whether or not to return a list of unused keyword arguments. Used for `from_pretrained` method in
                `PreTrainedModel`.
            kwargs (`dict[str, Any]`):
                Additional parameters from which to initialize the configuration object.

        Returns:
            [`QuantizationConfigMixin`]: The configuration object instantiated from those parameters.
        """
        config = cls(**config_dict)

        to_remove = []
        for key, value in kwargs.items():
            if hasattr(config, key):
                setattr(config, key, value)
                to_remove.append(key)
        for key in to_remove:
            kwargs.pop(key, None)

        if return_unused_kwargs:
            return config, kwargs
        else:
            return config

    def to_json_file(self, json_file_path: str | os.PathLike):
        """
        Save this instance to a JSON file.

        Args:
            json_file_path (`str` or `os.PathLike`):
                Path to the JSON file in which this configuration instance's parameters will be saved.
            use_diff (`bool`, *optional*, defaults to `True`):
                If set to `True`, only the difference between the config instance and the default
                `QuantizationConfig()` is serialized to JSON file.
        """
        with open(json_file_path, "w", encoding="utf-8") as writer:
            config_dict = self.to_dict()
            json_string = json.dumps(config_dict, indent=2, sort_keys=True) + "\n"

            writer.write(json_string)

    def to_dict(self) -> dict[str, Any]:
        """
        Serializes this instance to a Python dictionary. Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance.
        """
        return copy.deepcopy(self.__dict__)

    def __iter__(self):
        """allows `dict(obj)` for situations where obj may be a dict or QuantizationConfigMixin"""
        yield from copy.deepcopy(self.__dict__).items()

    def __repr__(self):
        return f"{self.__class__.__name__} {self.to_json_string()}"

    def to_diff_dict(self) -> dict[str, Any]:
        """
        Default behavior: no diffing implemented for this config.
        """
        return self.to_dict()

    def to_json_string(self, use_diff: bool = True) -> str:
        """
        Serializes this instance to a JSON string.

        Args:
            use_diff (`bool`, *optional*, defaults to `True`):
                If set to `True`, only the difference between the config instance and the default `PreTrainedConfig()`
                is serialized to JSON string.

        Returns:
            `str`: String containing all the attributes that make up this configuration instance in JSON format.
        """
        config_dict = self.to_diff_dict() if use_diff else self.to_dict()
        return json.dumps(config_dict, indent=2, sort_keys=True) + "\n"

    def update(self, **kwargs):
        """
        Updates attributes of this class instance with attributes from `kwargs` if they match existing attributes,
        returning all the unused kwargs.

        Args:
            kwargs (`dict[str, Any]`):
                Dictionary of attributes to tentatively update this class.

        Returns:
            `dict[str, Any]`: Dictionary containing all the key-value pairs that were not used to update the instance.
        """
        to_remove = []
        for key, value in kwargs.items():
            if hasattr(self, key):
                setattr(self, key, value)
                to_remove.append(key)

        # Remove all the attributes that were updated, without modifying the input dict
        unused_kwargs = {key: value for key, value in kwargs.items() if key not in to_remove}
        return unused_kwargs


@dataclass
class AutoRoundConfig(QuantizationConfigMixin):
    """This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded AutoRound quantization.

    Args:
        bits (`int`, *optional*, defaults to 4):
            The number of bits to quantize to, supported numbers are (2, 3, 4, 8).
        group_size (`int`, *optional*, defaults to 128): Group-size value
        sym (`bool`, *optional*, defaults to `True`): Symmetric quantization or not
        backend (`str`, *optional*, defaults to `"auto"`): The kernel to use, e.g., ipex,marlin, exllamav2, triton, etc. Ref. https://github.com/intel/auto-round?tab=readme-ov-file#specify-backend
    """

    def __init__(
        self,
        bits: int = 4,
        group_size: int = 128,
        sym: bool = True,
        backend: str = "auto",
        **kwargs,
    ):
        self.bits = bits
        self.group_size = group_size
        self.sym = sym
        self.backend = backend
        self.packing_format = "auto_round:gptq"
        if kwargs is not None:
            for key, value in kwargs.items():
                setattr(self, key, value)
        self.quant_method = QuantizationMethod.AUTOROUND
        self.post_init()

    def post_init(self):
        r"""Safety checker that arguments are correct."""
        if self.bits not in [2, 3, 4, 8]:
            raise ValueError(f"Only support quantization to [2,3,4,8] bits but found {self.bits}")
        if self.group_size != -1 and self.group_size <= 0:
            raise ValueError("group_size must be greater than 0 or equal to -1")

    def get_loading_attributes(self):
        loading_attributes_dict = {"backend": self.backend}
        return loading_attributes_dict

    def to_dict(self):
        config_dict = super().to_dict()
        return config_dict

    @classmethod
    def from_dict(cls, config_dict, return_unused_kwargs=False, **kwargs):
        quant_method = config_dict["quant_method"]
        if "auto-round" not in quant_method and "gptq" not in quant_method and "awq" not in quant_method:
            raise NotImplementedError(
                "Failed to convert to auto_round format. Only `gptqv1`, `awq`, and `auto-round` formats are supported."
            )

        if "gptq" in quant_method and "meta" in config_dict:
            raise NotImplementedError("Failed to convert gptq format to auto_round format. Only supports `gptqv1`")

        if "awq" in quant_method and config_dict.get("version", "gemm") != "gemm":
            raise NotImplementedError(
                "Failed to convert awq format to auto_round format. Only supports awq format with gemm version"
            )

        if "auto-round" not in quant_method:
            config_dict["packing_format"] = f"auto_round:{quant_method}"

        return super().from_dict(config_dict, return_unused_kwargs=return_unused_kwargs, **kwargs)


@dataclass
class HqqConfig(QuantizationConfigMixin):
    """
    This is wrapper around hqq's BaseQuantizeConfig.

    Args:
        nbits (`int`, *optional*, defaults to 4):
            Number of bits. Supported values are (8, 4, 3, 2, 1).
        group_size (`int`, *optional*, defaults to 64):
            Group-size value. Supported values are any value that is divisible by weight.shape[axis]).
        view_as_float (`bool`, *optional*, defaults to `False`):
            View the quantized weight as float (used in distributed training) if set to `True`.
        axis (`Optional[int]`, *optional*):
            Axis along which grouping is performed. Supported values are 0 or 1.
        dynamic_config (dict, *optional*):
            Parameters for dynamic configuration. The key is the name tag of the layer and the value is a quantization config.
            If set, each layer specified by its id will use its dedicated quantization configuration.
        skip_modules (`list[str]`, *optional*, defaults to `['lm_head']`):
            List of `nn.Linear` layers to skip.
        kwargs (`dict[str, Any]`, *optional*):
            Additional parameters from which to initialize the configuration object.
    """

    def __init__(
        self,
        nbits: int = 4,
        group_size: int = 64,
        view_as_float: bool = False,
        axis: int | None = None,
        dynamic_config: dict | None = None,
        skip_modules: list[str] = ["lm_head"],
        **kwargs,
    ):
        if is_hqq_available():
            from hqq.core.quantize import BaseQuantizeConfig as HQQBaseQuantizeConfig
        else:
            raise ImportError(
                "A valid HQQ version (>=0.2.1) is not available. Please follow the instructions to install it: `https://github.com/mobiusml/hqq/`."
            )

        if axis is None:
            axis = 1
            logger.info("Setting axis=1 as faster backends such as TorchAO or BitBlas are only compatible with it.")

        if axis not in [0, 1]:
            raise ValueError("Invalid axis value. Only 0 and 1 are allowed.")

        if dynamic_config is not None:
            self.quant_config = {}
            for key in dynamic_config:
                self.quant_config[key] = HQQBaseQuantizeConfig(**dynamic_config[key])
        else:
            self.quant_config = HQQBaseQuantizeConfig(
                nbits=nbits, group_size=group_size, view_as_float=view_as_float, axis=axis
            )

        self.quant_method = QuantizationMethod.HQQ
        self.skip_modules = skip_modules

        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """

    @classmethod
    def from_dict(cls, config: dict[str, Any]):
        """
        Override from_dict, used in AutoQuantizationConfig.from_dict in quantizers/auto.py
        """
        instance = cls()
        instance.quant_config = config["quant_config"]
        instance.skip_modules = config["skip_modules"]
        return instance

    def to_dict(self) -> dict[str, Any]:
        """
        Serializes this instance to a Python dictionary. Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance.
        """
        return {
            "quant_config": self.quant_config,
            "quant_method": self.quant_method,
            "skip_modules": self.skip_modules,
        }

    def __repr__(self):
        config_dict = self.to_dict()
        return f"{self.__class__.__name__} {json.dumps(config_dict, indent=2, sort_keys=True)}\n"

    def to_diff_dict(self) -> dict[str, Any]:
        """
        Removes all attributes from config which correspond to the default config attributes for better readability and
        serializes to a Python dictionary.
        Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance,
        """
        config_dict = self.to_dict()

        # get the default config dict
        default_config_dict = HqqConfig().to_dict()

        serializable_config_dict = {}

        # only serialize values that differ from the default config
        for key, value in config_dict.items():
            if value != default_config_dict[key]:
                serializable_config_dict[key] = value

        return serializable_config_dict


@dataclass
class BitsAndBytesConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using `bitsandbytes`.

    Currently only supports `LLM.int8()`, `FP4`, and `NF4` quantization. If more methods are added to `bitsandbytes`,
    then more arguments will be added to this class.

    Args:
        load_in_8bit (`bool`, *optional*, defaults to `False`):
            This flag is used to enable 8-bit quantization with LLM.int8().
        load_in_4bit (`bool`, *optional*, defaults to `False`):
            This flag is used to enable 4-bit quantization by replacing the Linear layers with FP4/NF4 layers from
            `bitsandbytes`.
        llm_int8_threshold (`float`, *optional*, defaults to 6.0):
            This corresponds to the outlier threshold for outlier detection as described in `LLM.int8() : 8-bit Matrix
            Multiplication for Transformers at Scale` paper: https://huggingface.co/papers/2208.07339 Any hidden states value
            that is above this threshold will be considered an outlier and the operation on those values will be done
            in fp16. Values are usually normally distributed, that is, most values are in the range [-3.5, 3.5], but
            there are some exceptional systematic outliers that are very differently distributed for large models.
            These outliers are often in the interval [-60, -6] or [6, 60]. Int8 quantization works well for values of
            magnitude ~5, but beyond that, there is a significant performance penalty. A good default threshold is 6,
            but a lower threshold might be needed for more unstable models (small models, fine-tuning).
        llm_int8_skip_modules (`list[str]`, *optional*):
            An explicit list of the modules that we do not want to convert in 8-bit. This is useful for models such as
            Jukebox that has several heads in different places and not necessarily at the last position. For example
            for `CausalLM` models, the last `lm_head` is kept in its original `dtype`.
        llm_int8_enable_fp32_cpu_offload (`bool`, *optional*, defaults to `False`):
            This flag is used for advanced use cases and users that are aware of this feature. If you want to split
            your model in different parts and run some parts in int8 on GPU and some parts in fp32 on CPU, you can use
            this flag. This is useful for offloading large models such as `google/flan-t5-xxl`. Note that the int8
            operations will not be run on CPU.
        llm_int8_has_fp16_weight (`bool`, *optional*, defaults to `False`):
            This flag runs LLM.int8() with 16-bit main weights. This is useful for fine-tuning as the weights do not
            have to be converted back and forth for the backward pass.
        bnb_4bit_compute_dtype (`torch.dtype` or str, *optional*, defaults to `torch.float32`):
            This sets the computational type which might be different than the input type. For example, inputs might be
            fp32, but computation can be set to bf16 for speedups.
        bnb_4bit_quant_type (`str`,  *optional*, defaults to `"fp4"`):
            This sets the quantization data type in the bnb.nn.Linear4Bit layers. Options are FP4 and NF4 data types
            which are specified by `fp4` or `nf4`.
        bnb_4bit_use_double_quant (`bool`, *optional*, defaults to `False`):
            This flag is used for nested quantization where the quantization constants from the first quantization are
            quantized again.
        bnb_4bit_quant_storage (`torch.dtype` or str, *optional*, defaults to `torch.uint8`):
            This sets the storage type to pack the quantized 4-bit params.
        kwargs (`dict[str, Any]`, *optional*):
            Additional parameters from which to initialize the configuration object.
    """

    def __init__(
        self,
        load_in_8bit=False,
        load_in_4bit=False,
        llm_int8_threshold=6.0,
        llm_int8_skip_modules=None,
        llm_int8_enable_fp32_cpu_offload=False,
        llm_int8_has_fp16_weight=False,
        bnb_4bit_compute_dtype=None,
        bnb_4bit_quant_type="fp4",
        bnb_4bit_use_double_quant=False,
        bnb_4bit_quant_storage=None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.BITS_AND_BYTES

        if load_in_4bit and load_in_8bit:
            raise ValueError("load_in_4bit and load_in_8bit are both True, but only one can be used at the same time")

        self._load_in_8bit = load_in_8bit
        self._load_in_4bit = load_in_4bit
        self.llm_int8_threshold = llm_int8_threshold
        self.llm_int8_skip_modules = llm_int8_skip_modules
        self.llm_int8_enable_fp32_cpu_offload = llm_int8_enable_fp32_cpu_offload
        self.llm_int8_has_fp16_weight = llm_int8_has_fp16_weight
        self.bnb_4bit_quant_type = bnb_4bit_quant_type
        self.bnb_4bit_use_double_quant = bnb_4bit_use_double_quant

        if bnb_4bit_compute_dtype is None:
            self.bnb_4bit_compute_dtype = torch.float32
        elif isinstance(bnb_4bit_compute_dtype, str):
            self.bnb_4bit_compute_dtype = getattr(torch, bnb_4bit_compute_dtype)
        elif isinstance(bnb_4bit_compute_dtype, torch.dtype):
            self.bnb_4bit_compute_dtype = bnb_4bit_compute_dtype
        else:
            raise ValueError("bnb_4bit_compute_dtype must be a string or a torch.dtype")

        if bnb_4bit_quant_storage is None:
            self.bnb_4bit_quant_storage = torch.uint8
        elif isinstance(bnb_4bit_quant_storage, str):
            if bnb_4bit_quant_storage not in ["float16", "float32", "int8", "uint8", "float64", "bfloat16"]:
                raise ValueError(
                    "`bnb_4bit_quant_storage` must be a valid string (one of 'float16', 'float32', 'int8', 'uint8', 'float64', 'bfloat16') "
                )
            self.bnb_4bit_quant_storage = getattr(torch, bnb_4bit_quant_storage)
        elif isinstance(bnb_4bit_quant_storage, torch.dtype):
            self.bnb_4bit_quant_storage = bnb_4bit_quant_storage
        else:
            raise ValueError("bnb_4bit_quant_storage must be a string or a torch.dtype")

        if kwargs:
            logger.info(f"Unused kwargs: {list(kwargs.keys())}. These kwargs are not used in {self.__class__}.")

        self.post_init()

    @property
    def load_in_4bit(self):
        return self._load_in_4bit

    @load_in_4bit.setter
    def load_in_4bit(self, value: bool):
        if not isinstance(value, bool):
            raise TypeError("load_in_4bit must be a boolean")

        if self.load_in_8bit and value:
            raise ValueError("load_in_4bit and load_in_8bit are both True, but only one can be used at the same time")
        self._load_in_4bit = value

    @property
    def load_in_8bit(self):
        return self._load_in_8bit

    @load_in_8bit.setter
    def load_in_8bit(self, value: bool):
        if not isinstance(value, bool):
            raise TypeError("load_in_8bit must be a boolean")

        if self.load_in_4bit and value:
            raise ValueError("load_in_4bit and load_in_8bit are both True, but only one can be used at the same time")
        self._load_in_8bit = value

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """
        if not isinstance(self.load_in_4bit, bool):
            raise TypeError("load_in_4bit must be a boolean")

        if not isinstance(self.load_in_8bit, bool):
            raise TypeError("load_in_8bit must be a boolean")

        if not isinstance(self.llm_int8_threshold, float):
            raise TypeError("llm_int8_threshold must be a float")

        if self.llm_int8_skip_modules is not None and not isinstance(self.llm_int8_skip_modules, list):
            raise TypeError("llm_int8_skip_modules must be a list of strings")
        if not isinstance(self.llm_int8_enable_fp32_cpu_offload, bool):
            raise TypeError("llm_int8_enable_fp32_cpu_offload must be a boolean")

        if not isinstance(self.llm_int8_has_fp16_weight, bool):
            raise TypeError("llm_int8_has_fp16_weight must be a boolean")

        if self.bnb_4bit_compute_dtype is not None and not isinstance(self.bnb_4bit_compute_dtype, torch.dtype):
            raise TypeError("bnb_4bit_compute_dtype must be torch.dtype")

        if not isinstance(self.bnb_4bit_quant_type, str):
            raise TypeError("bnb_4bit_quant_type must be a string")

        if not isinstance(self.bnb_4bit_use_double_quant, bool):
            raise TypeError("bnb_4bit_use_double_quant must be a boolean")

    def is_quantizable(self):
        r"""
        Returns `True` if the model is quantizable, `False` otherwise.
        """
        return self.load_in_8bit or self.load_in_4bit

    def quantization_method(self):
        r"""
        This method returns the quantization method used for the model. If the model is not quantizable, it returns
        `None`.
        """
        if self.load_in_8bit:
            return "llm_int8"
        elif self.load_in_4bit and self.bnb_4bit_quant_type == "fp4":
            return "fp4"
        elif self.load_in_4bit and self.bnb_4bit_quant_type == "nf4":
            return "nf4"
        else:
            return None

    def to_dict(self) -> dict[str, Any]:
        """
        Serializes this instance to a Python dictionary. Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance.
        """
        output = copy.deepcopy(self.__dict__)
        output["bnb_4bit_compute_dtype"] = str(output["bnb_4bit_compute_dtype"]).split(".")[1]
        output["bnb_4bit_quant_storage"] = str(output["bnb_4bit_quant_storage"]).split(".")[1]
        output["load_in_4bit"] = self.load_in_4bit
        output["load_in_8bit"] = self.load_in_8bit

        return output

    def __repr__(self):
        config_dict = self.to_dict()
        return f"{self.__class__.__name__} {json.dumps(config_dict, indent=2, sort_keys=True)}\n"

    def to_diff_dict(self) -> dict[str, Any]:
        """
        Removes all attributes from config which correspond to the default config attributes for better readability and
        serializes to a Python dictionary.

        Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance,
        """
        config_dict = self.to_dict()

        # get the default config dict
        default_config_dict = BitsAndBytesConfig().to_dict()

        serializable_config_dict = {}

        # only serialize values that differ from the default config
        for key, value in config_dict.items():
            if value != default_config_dict[key]:
                serializable_config_dict[key] = value

        return serializable_config_dict


class ExllamaVersion(int, Enum):
    ONE = 1
    TWO = 2


@dataclass
class GPTQConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using `optimum` api for GPTQ quantization relying on the gptqmodel backend.

    Args:
        bits (`int`):
            The number of bits to quantize to, supported numbers are (2, 3, 4, 8).
        tokenizer (`str` or `PreTrainedTokenizerBase`, *optional*):
            The tokenizer used to process the dataset. You can pass either:
                - A custom tokenizer object.
                - A string, the *model id* of a predefined tokenizer hosted inside a model repo on huggingface.co.
                - A path to a *directory* containing vocabulary files required by the tokenizer, for instance saved
                    using the [`~PreTrainedTokenizer.save_pretrained`] method, e.g., `./my_model_directory/`.
        dataset (`Union[list[str]]`, *optional*):
            The dataset used for quantization. You can provide your own dataset in a list of string or just use the
            original datasets used in GPTQ paper ['wikitext2','c4','c4-new']
        group_size (`int`, *optional*, defaults to 128):
            The group size to use for quantization. Recommended value is 128 and -1 uses per-column quantization.
        damp_percent (`float`, *optional*, defaults to 0.1):
            The percent of the average Hessian diagonal to use for dampening. Recommended value is 0.1.
        desc_act (`bool`, *optional*, defaults to `False`):
            Whether to quantize columns in order of decreasing activation size. Setting it to False can significantly
            speed up inference but the perplexity may become slightly worse. Also known as act-order.
        act_group_aware (`bool`, *optional*, defaults to `True`):
            Use GAR (group aware activation order) during quantization. Has measurable positive impact on quantization
            quality. Only applicable when `desc_act = False`. Will forced to be `False` when `desc_act = True`.
        sym (`bool`, *optional*, defaults to `True`):
            Whether to use symmetric quantization.
        true_sequential (`bool`, *optional*, defaults to `True`):
            Whether to perform sequential quantization even within a single Transformer block. Instead of quantizing
            the entire block at once, we perform layer-wise quantization. As a result, each layer undergoes
            quantization using inputs that have passed through the previously quantized layers.
        format (`str`, *optional*, defaults to `"gptq"`):
            GPTQ weight format. `gptq` (v1) is supported by gptqmodel. `gptq_v2` is gptqmodel only.
        meta (`dict[str, any]`, *optional*):
            Properties, such as tooling:version, that do not directly contributes to quantization or quant inference are stored in meta.
            i.e. `meta.quantizer`: ["optimum:_version_", "gptqmodel:_version_"]
        backend (`str`, *optional*):
            Controls which kernel to use. Valid values for gptqmodel are `auto`, `auto_trainable` and more. Ref gptqmodel backends:
            https://github.com/ModelCloud/GPTQModel/blob/main/gptqmodel/utils/backend.py
        model_seqlen (`int`, *optional*):
            The maximum sequence length that the model can take.
        block_name_to_quantize (`str`, *optional*):
            The transformers block name to quantize. If None, we will infer the block name using common patterns (e.g. model.layers)
        module_name_preceding_first_block (`list[str]`, *optional*):
            The layers that are preceding the first Transformer block.
        batch_size (`int`, *optional*, defaults to 1):
            The batch size used when processing the dataset
        pad_token_id (`int`, *optional*):
            The pad token id. Needed to prepare the dataset when `batch_size` > 1.
        max_input_length (`int`, *optional*):
            The maximum input length. This is needed to initialize a buffer that depends on the maximum expected input
            length. It is specific to the exllama backend with act-order.
        cache_block_outputs (`bool`, *optional*, defaults to `True`):
            Whether to cache block outputs to reuse as inputs for the succeeding block.
        modules_in_block_to_quantize (`list[list[str]]`, *optional*):
            List of list of module names to quantize in the specified block. This argument is useful to exclude certain linear modules from being quantized.
            The block to quantize can be specified by setting `block_name_to_quantize`. We will quantize each list sequentially. If not set, we will quantize all linear layers.
            Example: `modules_in_block_to_quantize =[["self_attn.k_proj", "self_attn.v_proj", "self_attn.q_proj"], ["self_attn.o_proj"]]`.
            In this example, we will first quantize the q,k,v layers simultaneously since they are independent.
            Then, we will quantize `self_attn.o_proj` layer with the q,k,v layers quantized. This way, we will get
            better results since it reflects the real input `self_attn.o_proj` will get when the model is quantized.
    """

    def __init__(
        self,
        bits: int,
        tokenizer: Any = None,
        dataset: list[str] | str | None = None,
        group_size: int = 128,
        damp_percent: float = 0.1,
        desc_act: bool = False,
        act_group_aware: bool = True,
        sym: bool = True,
        true_sequential: bool = True,
        format: str = "gptq",
        meta: dict[str, Any] | None = None,
        backend: str | None = None,
        model_seqlen: int | None = None,
        block_name_to_quantize: str | None = None,
        module_name_preceding_first_block: list[str] | None = None,
        batch_size: int = 1,
        pad_token_id: int | None = None,
        max_input_length: int | None = None,
        cache_block_outputs: bool = True,
        modules_in_block_to_quantize: list[list[str]] | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.GPTQ
        self.bits = bits
        self.tokenizer = tokenizer
        self.dataset = dataset
        self.group_size = group_size
        self.damp_percent = damp_percent
        self.desc_act = desc_act
        self.act_group_aware = act_group_aware
        self.sym = sym
        self.true_sequential = true_sequential
        self.format = format.lower()
        # Compatible with legacy field: checkpoint_format
        if kwargs.get("checkpoint_format") is not None:
            self.format = kwargs.pop("checkpoint_format").lower()
        self.meta = meta
        self.backend = backend.lower() if isinstance(backend, str) else backend
        self.model_seqlen = model_seqlen
        self.block_name_to_quantize = block_name_to_quantize
        self.module_name_preceding_first_block = module_name_preceding_first_block
        self.batch_size = batch_size
        self.pad_token_id = pad_token_id
        self.max_input_length = max_input_length
        self.cache_block_outputs = cache_block_outputs
        self.modules_in_block_to_quantize = modules_in_block_to_quantize
        self.post_init()

    def get_loading_attributes(self):
        attributes_dict = copy.deepcopy(self.__dict__)
        loading_attributes = ["max_input_length", "backend"]
        loading_attributes_dict = {i: j for i, j in attributes_dict.items() if i in loading_attributes}
        return loading_attributes_dict

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        if self.bits not in [2, 3, 4, 8]:
            raise ValueError(f"Only support quantization to [2,3,4,8] bits but found {self.bits}")
        if self.group_size != -1 and self.group_size <= 0:
            raise ValueError("group_size must be greater than 0 or equal to -1")
        if not (0 < self.damp_percent < 1):
            raise ValueError("damp_percent must between 0 and 1.")
        if self.dataset is not None:
            if isinstance(self.dataset, str):
                if self.dataset not in ["wikitext2", "c4", "c4-new"]:
                    raise ValueError(
                        f"""You have entered a string value for dataset. You can only choose between
                        ['wikitext2','c4','c4-new'], but we found {self.dataset}"""
                    )
            elif not isinstance(self.dataset, list):
                raise ValueError(
                    f"""dataset needs to be either a list of string or a value in
                    ['wikitext2','c4','c4-new'], but we found {self.dataset}"""
                )

        # act_group_order is only applicable when `desc_act = False`
        if self.desc_act and self.act_group_aware:
            self.act_group_aware = False
            logger.warning("`act_group_aware` has been auto-disabled as it is not compatible with `desc_act = True`.")

        # make sure backend default stays consistent with gptqmodel expectations
        if self.backend is None:
            self.backend = "auto"
        if self.modules_in_block_to_quantize is not None:
            optimum_version = version.parse(importlib.metadata.version("optimum"))
            if optimum_version < version.parse("1.15.0"):
                raise ValueError(
                    "You current version of `optimum` does not support `modules_in_block_to_quantize` quantization argument, please upgrade `optimum` package to a version superior than 1.15.0 ."
                )

    def to_dict(self) -> dict[str, Any]:
        config_dict = super().to_dict()
        # Compatible with legacy field: checkpoint_format
        config_dict["checkpoint_format"] = self.format
        return config_dict

    def to_dict_optimum(self):
        """
        Get compatible dict for optimum gptq config
        """
        return self.to_dict()

    @classmethod
    def from_dict_optimum(cls, config_dict):
        """
        Get compatible class with optimum gptq config dict
        """

        config = cls(**config_dict)
        return config


@dataclass
class AwqConfig(GPTQConfig):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using `auto-awq` library awq quantization relying on auto_awq backend.

    Args:
        bits (`int`, *optional*, defaults to 4):
            The number of bits to quantize to.
        group_size (`int`, *optional*, defaults to 128):
            The group size to use for quantization. Recommended value is 128 and -1 uses per-column quantization.
        zero_point (`bool`, *optional*, defaults to `True`):
            Whether to use zero point quantization.
        backend (`AwqBackend`, *optional*, defaults to `AwqBackend.AUTO`):
            The quantization backend.
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision (e.g. Whisper encoder, Llava encoder, Mixtral gate layers).
            Note you cannot quantize directly with transformers, please refer to `AutoAWQ` documentation for quantizing HF models.
    """

    def __init__(
        self,
        bits: int = 4,
        group_size: int = 128,
        zero_point: bool = True,
        backend: AwqBackend = AwqBackend.AUTO,
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        format = kwargs.pop("format", AwqFormat.GEMM)
        # Compatible with legacy field: version
        if kwargs.get("version") is not None:
            format = kwargs.pop("version").lower()
        # Compatible with legacy backend
        if backend == AwqBackend.LEGACY_AWQ:
            backend = AwqBackend.AUTO
        self.zero_point = zero_point
        self.modules_to_not_convert = modules_to_not_convert

        super().__init__(bits=bits, group_size=group_size, backend=backend, format=format, **kwargs)
        self.quant_method = QuantizationMethod.AWQ

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """

        if self.backend == "llm-awq":
            self.format = AwqFormat.LLM_AWQ
            self.backend = AwqBackend.AUTO

        if self.format not in AwqFormat.__members__.values():
            raise ValueError(f"Invalid format '{self.format}'. Must be one of: {[b.value for b in AwqFormat]}")

        if self.backend not in AwqBackend.__members__.values():
            raise ValueError(f"Invalid backend '{self.backend}'. Must be one of: {[b.value for b in AwqBackend]}")

    def to_dict(self) -> dict[str, Any]:
        config_dict = super().to_dict()
        config_dict.pop("checkpoint_format")
        # Compatible with legacy field: version
        config_dict["version"] = self.format
        return config_dict


@dataclass
class AqlmConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about `aqlm` parameters.

    Args:
        in_group_size (`int`, *optional*, defaults to 8):
            The group size along the input dimension.
        out_group_size (`int`, *optional*, defaults to 1):
            The group size along the output dimension. It's recommended to always use 1.
        num_codebooks (`int`, *optional*, defaults to 1):
            Number of codebooks for the Additive Quantization procedure.
        nbits_per_codebook (`int`, *optional*, defaults to 16):
            Number of bits encoding a single codebook vector. Codebooks size is 2**nbits_per_codebook.
        linear_weights_not_to_quantize (`Optional[list[str]]`, *optional*):
            List of full paths of `nn.Linear` weight parameters that shall not be quantized.
        kwargs (`dict[str, Any]`, *optional*):
            Additional parameters from which to initialize the configuration object.
    """

    def __init__(
        self,
        in_group_size: int = 8,
        out_group_size: int = 1,
        num_codebooks: int = 1,
        nbits_per_codebook: int = 16,
        linear_weights_not_to_quantize: list[str] | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.AQLM
        self.in_group_size = in_group_size
        self.out_group_size = out_group_size
        self.num_codebooks = num_codebooks
        self.nbits_per_codebook = nbits_per_codebook
        self.linear_weights_not_to_quantize = linear_weights_not_to_quantize

        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """
        if not isinstance(self.in_group_size, int):
            raise TypeError("in_group_size must be a float")
        if not isinstance(self.out_group_size, int):
            raise TypeError("out_group_size must be a float")
        if not isinstance(self.num_codebooks, int):
            raise TypeError("num_codebooks must be a float")
        if not isinstance(self.nbits_per_codebook, int):
            raise TypeError("nbits_per_codebook must be a float")

        if self.linear_weights_not_to_quantize is not None and not isinstance(
            self.linear_weights_not_to_quantize, list
        ):
            raise ValueError("linear_weights_not_to_quantize must be a list of strings")

        if self.linear_weights_not_to_quantize is None:
            self.linear_weights_not_to_quantize = []


@dataclass
class VptqLayerConfig(QuantizationConfigMixin):
    """
    This is used to explain vptq config params for each layer
    Args:
        enable_norm (`bool`, *optional*, defaults to `True`): to control if we have scale/bias for fp-weight
        enable_perm (`bool`, *optional*, defaults to `True`): to perm input_channel or not
        group_num (`int`, *optional*, defaults to `1`): how many single groups for vector-quantization
        group_size (`int`, *optional*, defaults to `-1`): depends on out-features
        indices_as_float (`bool`, *optional*, defaults to `False`): for Finetuning
        is_indice_packed (`bool`, *optional*, defaults to `True`): should always be True
        num_centroids (`list`, *optional*, defaults to `[-1, -1]`): centroid numbers of clusters
        num_res_centroids (`list`, *optional*, defaults to `[-1, -1]`): ditto for residual
        outlier_size (`int`, *optional*, defaults to `1`): outliers
        vector_lens (`list`, *optional*, defaults to `[-1, -1]`): centroid vector length in quantization
    """

    def __init__(
        self,
        enable_norm: bool = True,
        enable_perm: bool = True,
        group_num: int = 1,
        group_size: int = -1,
        in_features: int = -1,
        indices_as_float: bool = False,
        is_indice_packed: bool = True,
        num_centroids: list = [-1, -1],
        num_res_centroids: list = [-1, -1],
        out_features: int = -1,
        outlier_size: int = 0,
        vector_lens: list = [-1, -1],
        **kwargs,
    ):
        self.enable_norm = enable_norm
        self.enable_perm = enable_perm
        self.group_num = group_num
        self.group_size = group_size
        self.in_features = in_features
        self.indices_as_float = indices_as_float
        self.is_indice_packed = is_indice_packed
        self.num_centroids = num_centroids
        self.num_res_centroids = num_res_centroids
        self.out_features = out_features
        self.outlier_size = outlier_size
        self.vector_lens = vector_lens
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        if self.is_indice_packed is False:
            raise ValueError("is_indice_packed should always be True")


@dataclass
class VptqConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about `vptq` parameters.

    Args:
        enable_proxy_error (`bool`, *optional*, defaults to `False`): calculate proxy error for each layer
        config_for_layers (`Dict`, *optional*, defaults to `{}`): quantization params for each layer
        shared_layer_config (`Dict`, *optional*, defaults to `{}`): shared quantization params among layers
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision (e.g. Whisper encoder, Llava encoder, Mixtral gate layers).
        kwargs (`dict[str, Any]`, *optional*):
            Additional parameters from which to initialize the configuration object.
    """

    def __init__(
        self,
        enable_proxy_error: bool = False,
        config_for_layers: dict[str, Any] = {},
        shared_layer_config: dict[str, Any] = {},
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.VPTQ
        self.enable_proxy_error = enable_proxy_error
        self.config_for_layers: dict[str, Any] = config_for_layers
        self.shared_layer_config: dict[str, Any] = shared_layer_config
        self.modules_to_not_convert = modules_to_not_convert
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        for layer_param in self.config_for_layers.values():
            VptqLayerConfig(**layer_param)
        if self.enable_proxy_error is True:
            raise ValueError("enable_proxy_error should always be False until we support training")


@dataclass
class QuantoConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using `quanto`.

    Args:
        weights (`str`, *optional*, defaults to `"int8"`):
            The target dtype for the weights after quantization. Supported values are ("float8","int8","int4","int2")
        activations (`str`, *optional*):
            The target dtype for the activations after quantization. Supported values are (None,"int8","float8")
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision (e.g. Whisper encoder, Llava encoder, Mixtral gate layers).
    """

    def __init__(
        self,
        weights="int8",
        activations=None,
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.QUANTO
        self.weights = weights
        self.activations = activations
        self.modules_to_not_convert = modules_to_not_convert
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        accepted_weights = ["float8", "int8", "int4", "int2"]
        accepted_activations = [None, "int8", "float8"]
        if self.weights not in accepted_weights:
            raise ValueError(f"Only support weights in {accepted_weights} but found {self.weights}")
        if self.activations not in accepted_activations:
            raise ValueError(f"Only support weights in {accepted_activations} but found {self.activations}")


@dataclass
class EetqConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using `eetq`.

    Args:
        weights (`str`, *optional*, defaults to `"int8"`):
            The target dtype for the weights. Supported value is only "int8"
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision.
    """

    def __init__(
        self,
        weights: str = "int8",
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.EETQ
        self.weights = weights
        self.modules_to_not_convert = modules_to_not_convert
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        accepted_weights = ["int8"]
        if self.weights not in accepted_weights:
            raise ValueError(f"Only support weights in {accepted_weights} but found {self.weights}")


class CompressedTensorsConfig(QuantizationConfigMixin):
    """
    This is a wrapper class that handles compressed-tensors quantization config options.
    It is a wrapper around `compressed_tensors.QuantizationConfig`
    Args:
        config_groups (`typing.dict[str, typing.Union[ForwardRef('QuantizationScheme'), typing.list[str]]]`, *optional*):
            dictionary mapping group name to a quantization scheme definition
        format (`str`, *optional*, defaults to `"dense"`):
            format the model is represented as. Set `run_compressed` True to execute model as the
            compressed format if not `dense`
        quantization_status (`QuantizationStatus`, *optional*, defaults to `"initialized"`):
            status of model in the quantization lifecycle, ie 'initialized', 'calibration', 'frozen'
        kv_cache_scheme (`typing.Union[QuantizationArgs, NoneType]`, *optional*):
            specifies quantization of the kv cache. If None, kv cache is not quantized.
        global_compression_ratio (`typing.Union[float, NoneType]`, *optional*):
            0-1 float percentage of model compression
        ignore (`typing.Union[typing.list[str], NoneType]`, *optional*):
            layer names or types to not quantize, supports regex prefixed by 're:'
        sparsity_config (`typing.dict[str, typing.Any]`, *optional*):
            configuration for sparsity compression
        quant_method (`str`, *optional*, defaults to `"compressed-tensors"`):
            do not override, should be compressed-tensors
        run_compressed (`bool`, *optional*, defaults to `True`): alter submodules (usually linear) in order to
            emulate compressed model execution if True, otherwise use default submodule
    """

    def __init__(
        self,
        config_groups: dict[str, Union["QuantizationScheme", list[str]]] | None = None,  # noqa: F821
        format: str = "dense",
        quantization_status: "QuantizationStatus" = "initialized",  # noqa: F821
        kv_cache_scheme: Optional["QuantizationArgs"] = None,  # noqa: F821
        global_compression_ratio: float | None = None,
        ignore: list[str] | None = None,
        sparsity_config: dict[str, Any] | None = None,
        quant_method: str = "compressed-tensors",
        run_compressed: bool = True,
        **kwargs,
    ):
        if is_compressed_tensors_available():
            from compressed_tensors.config import SparsityCompressionConfig
            from compressed_tensors.quantization import QuantizationConfig
        else:
            raise ImportError(
                "compressed_tensors is not installed and is required for compressed-tensors quantization. Please install it with `pip install compressed-tensors`."
            )
        self.quantization_config = None
        self.sparsity_config = None

        self.run_compressed = run_compressed

        # parse from dict to load nested QuantizationScheme objects
        if config_groups or kv_cache_scheme:
            self.quantization_config = QuantizationConfig.model_validate(
                {
                    "config_groups": config_groups,
                    "quant_method": quant_method,
                    "format": format,
                    "quantization_status": quantization_status,
                    "kv_cache_scheme": kv_cache_scheme,
                    "global_compression_ratio": global_compression_ratio,
                    "ignore": ignore,
                    **kwargs,
                }
            )

        if sparsity_config:
            self.sparsity_config = SparsityCompressionConfig.load_from_registry(
                sparsity_config.get("format"), **sparsity_config
            )

        self.quant_method = QuantizationMethod.COMPRESSED_TENSORS

    def post_init(self):
        if self.run_compressed:
            if self.is_sparsification_compressed:
                logger.warning(
                    "`run_compressed` is only supported for quantized_compressed models"
                    " and not for sparsified models. Setting `run_compressed=False`"
                )
                self.run_compressed = False
            elif not self.is_quantization_compressed:
                logger.warning(
                    "`run_compressed` is only supported for compressed models. Setting `run_compressed=False`"
                )
                self.run_compressed = False

    @classmethod
    def from_dict(cls, config_dict, return_unused_kwargs=False, **kwargs):
        """
        Instantiates a [`CompressedTensorsConfig`] from a Python dictionary of parameters.
        Optionally unwraps any args from the nested quantization_config

        Args:
            config_dict (`dict[str, Any]`):
                Dictionary that will be used to instantiate the configuration object.
            return_unused_kwargs (`bool`,*optional*, defaults to `False`):
                Whether or not to return a list of unused keyword arguments. Used for `from_pretrained` method in
                `PreTrainedModel`.
            kwargs (`dict[str, Any]`):
                Additional parameters from which to initialize the configuration object.

        Returns:
            [`QuantizationConfigMixin`]: The configuration object instantiated from those parameters.

        """

        if "quantization_config" in config_dict:
            config_dict = dict(
                sparsity_config=config_dict.get("sparsity_config"),
                **config_dict["quantization_config"],
            )

        return super().from_dict(config_dict, return_unused_kwargs=return_unused_kwargs, **kwargs)

    def to_dict(self) -> dict[str, Any]:
        """
        Quantization config to be added to config.json

        Serializes this instance to a Python dictionary. Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance.
        """
        quantization_config = {}
        if self.quantization_config is not None:
            quantization_config = self.quantization_config.model_dump()
        else:
            quantization_config["quant_method"] = QuantizationMethod.COMPRESSED_TENSORS

        if self.sparsity_config is not None:
            quantization_config["sparsity_config"] = self.sparsity_config.model_dump()
        else:
            quantization_config["sparsity_config"] = {}

        return quantization_config

    def to_diff_dict(self) -> dict[str, Any]:
        """
        Removes all attributes from config which correspond to the default config attributes for better readability and
        serializes to a Python dictionary.
        Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance,
        """
        config_dict = self.to_dict()

        # get the default config dict
        default_config_dict = CompressedTensorsConfig().to_dict()

        serializable_config_dict = {}

        # only serialize values that differ from the default config
        for key, value in config_dict.items():
            if key not in default_config_dict or value != default_config_dict[key]:
                serializable_config_dict[key] = value

        return serializable_config_dict

    def get_loading_attributes(self):
        return {"run_compressed": self.run_compressed}

    @property
    def is_quantized(self):
        return bool(self.quantization_config) and bool(self.quantization_config.config_groups)

    @property
    def is_quantization_compressed(self):
        from compressed_tensors.quantization import QuantizationStatus

        qc = self.quantization_config
        return self.is_quantized and (qc is not None and qc.quantization_status == QuantizationStatus.COMPRESSED)

    @property
    def is_sparsification_compressed(self):
        from compressed_tensors.config import (
            CompressionFormat,
            SparsityCompressionConfig,
        )

        return (
            isinstance(self.sparsity_config, SparsityCompressionConfig)
            and self.sparsity_config.format != CompressionFormat.dense.value
        )


@dataclass
class FbgemmFp8Config(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using fbgemm fp8 quantization.

    Args:
        activation_scale_ub (`float`, *optional*, defaults to 1200.0):
            The activation scale upper bound. This is used when quantizing the input activation.
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision.
    """

    def __init__(
        self,
        activation_scale_ub: float = 1200.0,
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.FBGEMM_FP8
        self.activation_scale_ub = activation_scale_ub
        self.modules_to_not_convert = modules_to_not_convert

    def get_loading_attributes(self):
        attributes_dict = copy.deepcopy(self.__dict__)
        loading_attributes = ["activation_scale_ub"]
        loading_attributes_dict = {i: j for i, j in attributes_dict.items() if i in loading_attributes}
        return loading_attributes_dict


@dataclass
class HiggsConfig(QuantizationConfigMixin):
    """
    HiggsConfig is a configuration class for quantization using the HIGGS method.

    Args:
        bits (int, *optional*, defaults to 4):
            Number of bits to use for quantization. Can be 2, 3 or 4. Default is 4.
        p (int, *optional*, defaults to 2):
            Quantization grid dimension. 1 and 2 are supported. 2 is always better in practice. Default is 2.
        modules_to_not_convert (`list`, *optional*, default to ["lm_head"]):
            List of linear layers that should not be quantized.
        hadamard_size (int, *optional*, defaults to 512):
            Hadamard size for the HIGGS method. Default is 512. Input dimension of matrices is padded to this value. Decreasing this below 512 will reduce the quality of the quantization.
        group_size (int, *optional*, defaults to 256):
            Group size for the HIGGS method. Can be 64, 128 or 256. Decreasing it barely affects the performance. Default is 256. Must be a divisor of hadamard_size.
        tune_metadata ('dict', *optional*, defaults to {}):
            Module-wise metadata (gemm block shapes, GPU metadata, etc.) for saving the kernel tuning results. Default is an empty dictionary. Is set automatically during tuning.
    """

    def __init__(
        self,
        bits: int = 4,
        p: int = 2,
        modules_to_not_convert: list[str] | None = None,
        hadamard_size: int = 512,
        group_size: int = 256,
        tune_metadata: dict[str, Any] | None = None,
        **kwargs,
    ):
        if tune_metadata is None:
            tune_metadata = {}
        self.quant_method = QuantizationMethod.HIGGS
        self.bits = bits
        self.p = p
        self.modules_to_not_convert = modules_to_not_convert
        self.hadamard_size = hadamard_size
        self.group_size = group_size
        self.tune_metadata = tune_metadata

        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """
        if self.bits not in [2, 3, 4]:
            raise ValueError("bits must be 2, 3, or 4")
        if self.p not in [1, 2]:
            raise ValueError("p must be 1 or 2. 2 is always better in practice")
        if self.group_size not in [64, 128, 256]:
            raise ValueError("group_size must be 64, 128, or 256")
        if self.hadamard_size % self.group_size != 0:
            raise ValueError("hadamard_size must be divisible by group_size")


@dataclass
class FPQuantConfig(QuantizationConfigMixin):
    """
    FPQuantConfig is a configuration class for quantization using the FPQuant method.

    Args:
        forward_dtype (`str`, *optional*, defaults to `"nvfp4"`):
            The dtype to use for the forward pass.
        forward_method (`str`, *optional*, defaults to `"abs_max"`):
            The scaling to use for the forward pass. Can be `"abs_max"` or `"quest"`. `"abs_max"` is better for PTQ, `"quest"` is better for QAT.
        backward_dtype (`str`, *optional*, defaults to `"bf16"`):
            The dtype to use for the backward pass.
        store_master_weights (`bool`, *optional*, defaults to `False`):
            Whether to store the master weights. Needed for QAT over layer weights.
        hadamard_group_size (`int`, *optional*):
            The group size for the hadamard transform before quantization for `"quest"` it matches the MXFP4 group size (32). If `None`, it will be set to 16 for `"nvfp4"` and 32 for `"mxfp4"`.
        pseudoquantization (`bool`, *optional*, defaults to `False`):
            Whether to use Triton-based pseudo-quantization. Is mandatory for non-Blackwell GPUs. Doesn't provide any speedup. For debugging purposes.
        transform_init (`str`, *optional*, defaults to `"hadamard"`): a method to initialize the pre-processing matrix with. Can be `"hadamard"`, `"identity"` or `"gsr"`.
        modules_to_not_convert (`list`, *optional*):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision.
    """

    def __init__(
        self,
        forward_dtype: str = "nvfp4",
        forward_method: str = "abs_max",
        backward_dtype: str = "bf16",
        store_master_weights: bool = False,
        hadamard_group_size: int | None = None,
        pseudoquantization: bool = False,
        transform_init: str = "hadamard",
        modules_to_not_convert: list[str] | None = None,
        **kwargs,
    ):
        self.forward_dtype = forward_dtype
        self.forward_method = forward_method
        self.backward_dtype = backward_dtype
        self.store_master_weights = store_master_weights
        self.hadamard_group_size = hadamard_group_size
        self.pseudoquantization = pseudoquantization
        self.transform_init = transform_init
        self.modules_to_not_convert = modules_to_not_convert

        self.quant_method = QuantizationMethod.FPQUANT
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """

        if self.hadamard_group_size is None:
            if self.forward_dtype == "nvfp4":
                self.hadamard_group_size = 16
            else:
                self.hadamard_group_size = 32

        if self.forward_dtype == "mxfp4":
            if self.forward_method not in ["abs_max", "quest"]:
                raise ValueError("Only 'abs_max' and 'quest' are supported for forward_method for 'mxfp4'.")
            if self.hadamard_group_size is None:
                self.hadamard_group_size = 32
            if self.hadamard_group_size not in [32, 64, 128]:
                raise ValueError("Only a `hadamard_group_size` of [32, 64, 128] is supported for 'mxfp4'.")
        elif self.forward_dtype == "nvfp4":
            if self.forward_method != "abs_max":
                raise ValueError("Only 'abs_max' is supported for forward_method for 'nvfp4'.")
            if self.hadamard_group_size is None:
                self.hadamard_group_size = 16
            if self.hadamard_group_size not in [16, 32, 64, 128]:
                raise ValueError("Only a `hadamard_group_size` of [16, 32, 64, 128] is supported for 'nvfp4'.")
        else:
            raise ValueError("Only 'mxfp4' and 'nvfp4' are supported for forward_dtype for now.")

        if self.backward_dtype not in ["bf16", "mxfp8", "mxfp4"]:
            raise ValueError("Only 'bf16', 'mxfp8' and 'mxfp4' are supported for backward_dtype for now.")

        if self.backward_dtype != "bf16" and self.forward_dtype != "mxfp4":
            raise ValueError("Only 'mxfp4' forward is compatible with non-bf16 backwards for now.")

        if self.transform_init not in ["hadamard", "identity", "gsr"]:
            raise ValueError("Only 'hadamard', 'identity' and 'gsr' are supported for transform_init.")

        if self.modules_to_not_convert is None:
            self.modules_to_not_convert = ["lm_head"]


@dataclass
class TorchAoConfig(QuantizationConfigMixin):
    quant_method: QuantizationMethod
    quant_type: Union[str, "AOBaseConfig"]  # noqa: F821
    modules_to_not_convert: list | None
    quant_type_kwargs: dict[str, Any]
    include_input_output_embeddings: bool
    untie_embedding_weights: bool

    """This is a config class for torchao quantization/sparsity techniques.

    Args:
        quant_type (`Union[str, AOBaseConfig]`):
            The type of quantization we want to use. Can be either:
            - A string: currently supporting: `int4_weight_only`, `int8_weight_only` and `int8_dynamic_activation_int8_weight`.
            - An AOBaseConfig instance: for more advanced configuration options.
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision.
        include_input_output_embeddings (`bool`, default to `False`):
            Whether to include embedding in quantization or not, input embedding will be removed from
            the module_not_to_convert list as well if this flag is set.
        untie_embedding_weights (`bool`, default to `False`):
            Whether to untie the weights when we are quantizing input embedding weights that is tied
            to other weights.
        kwargs (`dict[str, Any]`, *optional*):
            The keyword arguments for the chosen type of quantization, for example, int4_weight_only quantization supports two keyword arguments
            `group_size` and `inner_k_tiles` currently. More API examples and documentation of arguments can be found in
            https://github.com/pytorch/ao/tree/main/torchao/quantization#other-available-quantization-techniques

    Example:

    ```python
    # AOBaseConfig-based configuration
    config = Int4WeightOnlyConfig(group_size=32)
    quantization_config = TorchAoConfig(config)
    model = AutoModelForCausalLM.from_pretrained(model_id, device_map="cuda", dtype=torch.bfloat16, quantization_config=quantization_config)

    # String-based configuration
    quantization_config = TorchAoConfig("int4_weight_only", group_size=32)
    # int4_weight_only quant is only working with *torch.bfloat16* dtype right now
    model = AutoModelForCausalLM.from_pretrained(model_id, device_map="cuda", dtype=torch.bfloat16, quantization_config=quantization_config)

    ```
    """

    def __init__(
        self,
        quant_type: Union[str, "AOBaseConfig"],  # noqa: F821
        modules_to_not_convert: list | None = None,
        include_input_output_embeddings: bool = False,
        untie_embedding_weights: bool = False,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.TORCHAO
        self.quant_type = quant_type
        self.modules_to_not_convert = modules_to_not_convert
        self.quant_type_kwargs = kwargs.get("quant_type_kwargs", kwargs)
        self.include_input_output_embeddings = include_input_output_embeddings
        self.untie_embedding_weights = untie_embedding_weights
        self.post_init()

    @staticmethod
    def _get_ao_version() -> version.Version:
        """Centralized check for TorchAO availability and version requirements."""
        if not is_torchao_available():
            raise ValueError("TorchAoConfig requires torchao to be installed. Install with `pip install torchao`")

        return version.parse(importlib.metadata.version("torchao"))

    def post_init(self):
        """Validate configuration and set defaults."""
        ao_version = self._get_ao_version()

        # Handle quant_type based on type and version
        if isinstance(self.quant_type, str):
            self._validate_string_quant_type()
        elif ao_version > version.parse("0.9.0"):
            from torchao.quantization.quant_api import AOBaseConfig

            if not isinstance(self.quant_type, AOBaseConfig):
                raise TypeError(
                    f"quant_type must be either a string or an AOBaseConfig instance, got {type(self.quant_type)}"
                )
        else:
            raise ValueError(
                f"In torchao <= 0.9.0, quant_type must be a string. Got {type(self.quant_type)}. "
                f"Please upgrade to torchao > 0.9.0 to use AOBaseConfig instances."
            )

    def _validate_string_quant_type(self):
        """Validate string quant_type and its kwargs."""
        methods = self._get_torchao_quant_type_to_method()

        if self.quant_type not in methods:
            raise ValueError(
                f"Unsupported string quantization type: {self.quant_type}. "
                f"Supported types: {', '.join(methods.keys())}"
            )

        # Validate kwargs against method signature
        method = methods[self.quant_type]
        sig = signature(method)
        valid_kwargs = {
            param.name
            for param in sig.parameters.values()
            if param.kind in [Parameter.KEYWORD_ONLY, Parameter.POSITIONAL_OR_KEYWORD]
        }

        invalid_kwargs = set(self.quant_type_kwargs) - valid_kwargs
        if invalid_kwargs:
            raise ValueError(
                f"Unexpected keyword arg for {self.quant_type}: {', '.join(invalid_kwargs)}. "
                f"Valid kwargs: {', '.join(valid_kwargs)}"
            )

    def _get_torchao_quant_type_to_method(self):
        """Get mapping of quant_type strings to their corresponding methods."""
        from torchao.quantization import (
            int4_weight_only,
            int8_dynamic_activation_int8_weight,
            int8_weight_only,
        )

        return {
            "int4_weight_only": int4_weight_only,
            "int8_weight_only": int8_weight_only,
            "int8_dynamic_activation_int8_weight": int8_dynamic_activation_int8_weight,
        }

    def get_apply_tensor_subclass(self):
        """Create the appropriate quantization method based on configuration."""
        if isinstance(self.quant_type, str):
            methods = self._get_torchao_quant_type_to_method()
            quant_type_kwargs = self.quant_type_kwargs.copy()
            if (
                not torch.cuda.is_available()
                and is_torchao_available()
                and self.quant_type == "int4_weight_only"
                and version.parse(importlib.metadata.version("torchao")) >= version.parse("0.8.0")
                and quant_type_kwargs.get("layout", None) is None
            ):
                if torch.xpu.is_available():
                    if version.parse(importlib.metadata.version("torchao")) >= version.parse(
                        "0.11.0"
                    ) and version.parse(importlib.metadata.version("torch")) > version.parse("2.7.9"):
                        from torchao.dtypes import Int4XPULayout
                        from torchao.quantization.quant_primitives import ZeroPointDomain

                        quant_type_kwargs["layout"] = Int4XPULayout()
                        quant_type_kwargs["zero_point_domain"] = ZeroPointDomain.INT
                    else:
                        raise ValueError(
                            "TorchAoConfig requires torchao >= 0.11.0 and torch >= 2.8.0 for XPU support. Please upgrade the version or use run on CPU with the cpu version pytorch."
                        )
                else:
                    from torchao.dtypes import Int4CPULayout

                    quant_type_kwargs["layout"] = Int4CPULayout()

            return methods[self.quant_type](**quant_type_kwargs)
        else:
            return self.quant_type

    def to_dict(self):
        """Convert configuration to a dictionary."""
        d = super().to_dict()

        if isinstance(self.quant_type, str):
            # Handle layout serialization if present
            if "quant_type_kwargs" in d and "layout" in d["quant_type_kwargs"]:
                if is_dataclass(d["quant_type_kwargs"]["layout"]):
                    d["quant_type_kwargs"]["layout"] = [
                        d["quant_type_kwargs"]["layout"].__class__.__name__,
                        dataclasses.asdict(d["quant_type_kwargs"]["layout"]),
                    ]
                if isinstance(d["quant_type_kwargs"]["layout"], list):
                    assert len(d["quant_type_kwargs"]["layout"]) == 2, "layout saves layout name and layout kwargs"
                    assert isinstance(d["quant_type_kwargs"]["layout"][0], str), "layout name must be a string"
                    assert isinstance(d["quant_type_kwargs"]["layout"][1], dict), "layout kwargs must be a dict"
                else:
                    raise ValueError("layout must be a list")
        else:
            # Handle AOBaseConfig serialization
            from torchao.core.config import config_to_dict

            # For now we assume there is 1 config per Transformer, however in the future
            # We may want to support a config per fqn.
            d["quant_type"] = {"default": config_to_dict(self.quant_type)}

        return d

    @classmethod
    def from_dict(cls, config_dict, return_unused_kwargs=False, **kwargs):
        """Create configuration from a dictionary."""
        ao_version = cls._get_ao_version()
        assert ao_version > version.parse("0.9.0"), "TorchAoConfig requires torchao > 0.9.0 for construction from dict"
        config_dict = config_dict.copy()
        quant_type = config_dict.pop("quant_type")

        if isinstance(quant_type, str):
            return cls(quant_type=quant_type, **config_dict)
        # Check if we only have one key which is "default"
        # In the future we may update this
        assert len(quant_type) == 1 and "default" in quant_type, (
            "Expected only one key 'default' in quant_type dictionary"
        )
        quant_type = quant_type["default"]

        # Deserialize quant_type if needed
        from torchao.core.config import config_from_dict

        quant_type = config_from_dict(quant_type)

        return cls(quant_type=quant_type, **config_dict)


@dataclass
class BitNetQuantConfig(QuantizationConfigMixin):
    """
    Configuration class for applying BitNet quantization.

    Args:
        modules_to_not_convert (`Optional[List]`, *optional*):
            Optionally, provides a list of full paths of `nn.Linear` weight parameters
            that shall not be quantized. Defaults to None.
        linear_class (`str`, *optional*, defaults to `"bitlinear"`):
            The type of linear class to use. Can be either `bitlinear` or `autobitlinear`.
        quantization_mode (`str`, *optional*, defaults to `"offline"`):
            The quantization mode to use. Can be either `online` or `offline`.
            In `online` mode, the weight quantization parameters are calculated dynamically
            during each forward pass (e.g., based on the current weight values). This can
            adapt to weight changes during training (Quantization-Aware Training - QAT).
            In `offline` mode, quantization parameters are pre-calculated *before* inference.
            These parameters are then fixed and loaded into the quantized model. This
            generally results in lower runtime overhead compared to online quantization.
        use_rms_norm (`bool`, *optional*, defaults to `False`):
            Whether to apply RMSNorm on the activations before quantization. This matches the original BitNet paper's approach
            of normalizing activations before quantization/packing.
        rms_norm_eps (`float`, *optional*, defaults to 1e-06):
            The epsilon value used in the RMSNorm layer for numerical stability.
        kwargs (`dict[str, Any]`, *optional*):
            Additional keyword arguments that may be used by specific quantization
            backends or future versions.
    """

    def __init__(
        self,
        modules_to_not_convert: list | None = None,
        linear_class: str = "bitlinear",
        quantization_mode: str = "offline",
        use_rms_norm: bool = False,
        rms_norm_eps: float | None = 1e-6,
        **kwargs,
    ):
        if linear_class not in ["bitlinear", "autobitlinear"]:
            raise ValueError(f"linear_class must be either 'bitlinear' or 'autobitlinear', but got {linear_class}")
        if quantization_mode not in ["online", "offline"]:
            raise ValueError(f"quantization_mode must be either 'online' or 'offline', but got {quantization_mode}")
        self.quant_method = QuantizationMethod.BITNET
        self.modules_to_not_convert = modules_to_not_convert
        self.linear_class = linear_class
        self.quantization_mode = quantization_mode
        self.use_rms_norm = use_rms_norm
        self.rms_norm_eps = rms_norm_eps
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """


@dataclass
class SpQRConfig(QuantizationConfigMixin):
    """
    This is a wrapper class about `spqr` parameters. Refer to the original publication for more details.

    Args:
        bits (`int`, *optional*, defaults to 3):
            Specifies the bit count for the weights and first order zero-points and scales.
            Currently only bits = 3 is supported.
        beta1 (`int`, *optional*, defaults to 16):
            SpQR tile width. Currently only beta1 = 16 is supported.
        beta2 (`int`, *optional*, defaults to 16):
            SpQR tile height. Currently only beta2 = 16 is supported.
        shapes (`Optional`, *optional*):
            A dictionary holding the shape of each object. We need this because it's impossible
            to deduce the exact size of the parameters just from bits, beta1, beta2.
        modules_to_not_convert (`Optional[list[str]]`, *optional*):
            Optionally, provides a list of full paths of `nn.Linear` weight parameters that shall not be quantized.
            Defaults to None.
        kwargs (`dict[str, Any]`, *optional*):
            Additional parameters from which to initialize the configuration object.
    """

    def __init__(
        self,
        bits: int = 3,
        beta1: int = 16,
        beta2: int = 16,
        shapes: dict[str, int] | None = None,
        modules_to_not_convert: list[str] | None = None,
        **kwargs,
    ):
        if shapes is None:
            shapes = {}
        self.shapes = shapes
        self.quant_method = QuantizationMethod.SPQR
        self.bits = bits
        self.beta1 = beta1
        self.beta2 = beta2
        self.modules_to_not_convert = modules_to_not_convert
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct - also replaces some NoneType arguments with their default values.
        """
        if not isinstance(self.bits, int):
            raise TypeError("bits must be an int")
        if not isinstance(self.beta1, int):
            raise TypeError("beta1 must be an int")
        if not isinstance(self.beta2, int):
            raise TypeError("beta2 must be an int")

        if self.bits != 3:
            raise ValueError("SpQR currently only supports bits = 3")
        if self.beta1 != 16:
            raise ValueError("SpQR currently only supports beta1 = 16")
        if self.beta2 != 16:
            raise ValueError("SpQR currently only supports beta2 = 16")
        if not isinstance(self.shapes, dict):
            raise TypeError("shapes must be a dict")


@dataclass
class FineGrainedFP8Config(QuantizationConfigMixin):
    """
    FineGrainedFP8Config is a configuration class for fine-grained FP8 quantization used mainly for deepseek models.

    Args:
        activation_scheme (`str`, *optional*, defaults to `"dynamic"`):
            The scheme used for activation, the defaults and only support scheme for now is "dynamic".
        weight_block_size (`typing.tuple[int, int]`, *optional*, defaults to `(128, 128)`):
            The size of the weight blocks for quantization, default is (128, 128).
        dequantize (`bool`, *optional*, defaults to `False`):
            Whether to dequantize the model during loading.
        modules_to_not_convert (`list`, *optional*):
            A list of module names that should not be converted during quantization.
    """

    def __init__(
        self,
        activation_scheme: str = "dynamic",
        weight_block_size: tuple[int, int] = (128, 128),
        dequantize: bool = False,
        modules_to_not_convert: list | None = None,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.FP8
        self.modules_to_not_convert = modules_to_not_convert
        self.activation_scheme = activation_scheme
        self.weight_block_size = weight_block_size
        self.dequantize = dequantize
        self.post_init()

    def post_init(self):
        r"""
        Safety checker that arguments are correct
        """
        self.activation_scheme = self.activation_scheme.lower()
        if self.activation_scheme not in ["dynamic", "static"]:
            raise ValueError(f"Activation scheme {self.activation_scheme} not supported")
        if self.weight_block_size is not None and len(self.weight_block_size) != 2:
            raise ValueError("weight_block_size must be a tuple of two integers")
        if self.weight_block_size is not None and (self.weight_block_size[0] <= 0 or self.weight_block_size[1] <= 0):
            raise ValueError("weight_block_size must be a tuple of two positive integers")

    def get_loading_attributes(self):
        return {"dequantize": self.dequantize}


class QuarkConfig(QuantizationConfigMixin):
    def __init__(
        self,
        **kwargs,
    ):
        if is_torch_available() and is_quark_available():
            from quark import __version__ as quark_version
            from quark.torch.export.config.config import JsonExporterConfig
            from quark.torch.export.main_export.quant_config_parser import QuantConfigParser
            from quark.torch.quantization.config.config import Config
        else:
            raise ImportError(
                "Quark is not installed. Please refer to https://quark.docs.amd.com/latest/install.html."
            )
        # This might be e.g. `"fp8"` or `"awq"`.
        self.custom_mode = kwargs["quant_method"]
        self.legacy = "export" not in kwargs

        if self.custom_mode in ["awq", "fp8"]:
            # Legacy (quark<1.0) or custom export.
            self.quant_config = QuantConfigParser.from_custom_config(kwargs, is_bias_quantized=False)
            self.json_export_config = JsonExporterConfig()
        else:
            self.quant_config = Config.from_dict(kwargs)

            if "export" in kwargs:
                # TODO: Remove this check once configuration version is handled natively by Quark.
                if "min_kv_scale" in kwargs["export"] and version.parse(quark_version) < version.parse("0.8"):
                    min_kv_scale = kwargs["export"].pop("min_kv_scale")
                    logger.warning(
                        f"The parameter `min_kv_scale={min_kv_scale}` was found in the model config.json's `quantization_config.export` configuration, but this parameter is supported only for quark>=0.8. Ignoring this configuration parameter. Please update the `amd-quark` package."
                    )

                self.json_export_config = JsonExporterConfig(**kwargs["export"])
            else:
                # Legacy (quark<1.0) or custom export.
                self.json_export_config = JsonExporterConfig()

        self.quant_method = QuantizationMethod.QUARK


@dataclass
class Mxfp4Config(QuantizationConfigMixin):
    """
    This is a wrapper class about all possible attributes and features that you can play with a model that has been
    loaded using mxfp4 quantization.

    Args:
        modules_to_not_convert (`list`, *optional*, default to `None`):
            The list of modules to not quantize, useful for quantizing models that explicitly require to have
            some modules left in their original precision.
        dequantize (`bool`, *optional*, default to `False`):
            Whether we dequantize the model to bf16 precision or not
    """

    def __init__(
        self,
        modules_to_not_convert: list | None = None,
        dequantize: bool = False,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.MXFP4
        self.modules_to_not_convert = modules_to_not_convert
        self.dequantize = dequantize

    def get_loading_attributes(self):
        return {"dequantize": self.dequantize}

    def to_dict(self) -> dict[str, Any]:
        """
        Serializes this instance to a Python dictionary. Returns:
            `dict[str, Any]`: Dictionary of all the attributes that make up this configuration instance.
        """
        return {"quant_method": self.quant_method, "modules_to_not_convert": self.modules_to_not_convert}


class MetalConfig(QuantizationConfigMixin):
    """
    Configuration class for Metal affine quantization targeting Apple Silicon (MPS) devices.

    This quantization method uses the ``mlx-quantization-metal-kernels`` Metal kernels from the Hugging Face Hub
    to perform affine quantization (scales + qbiases) with configurable bit-width and group size.
    The quantized weights are packed into ``uint32`` tensors and the forward pass uses fused
    dequantization + matmul Metal kernels.
    """

    def __init__(
        self,
        bits: int = 4,
        group_size: int = 64,
        modules_to_not_convert: list | None = None,
        dequantize: bool = False,
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.METAL
        self.bits = bits
        self.group_size = group_size
        self.modules_to_not_convert = modules_to_not_convert
        self.dequantize = dequantize
        self.post_init()

    def post_init(self):
        if self.bits not in (2, 4, 8):
            raise ValueError(f"Metal quantization only supports bits in {{2, 4, 8}}, got {self.bits}")
        if self.group_size <= 0:
            raise ValueError(f"group_size must be positive, got {self.group_size}")

    def get_loading_attributes(self):
        return {"dequantize": self.dequantize}

    def to_dict(self) -> dict[str, Any]:
        return {
            "quant_method": self.quant_method,
            "bits": self.bits,
            "group_size": self.group_size,
            "modules_to_not_convert": self.modules_to_not_convert,
        }


@dataclass
class FourOverSixConfig(QuantizationConfigMixin):
    """
    This is a wrapper class containing all options for quantization with `fouroversix`. In brief,
    Four Over Six is a modification to NVFP4 quantization which adaptively scales the largest value
    in each block of 16 FP4 values to either 4 or 6. Selecting a scale of 6 uses the full range of
    FP4 values, but selecting a scale of 4 allows for a more uniform distribution of quantization
    error. Refer to the original publication for more details: https://arxiv.org/abs/2512.02010.

    Args:
        activation_scale_rule (`str`, *optional*):
            Scaling rule to use when selecting a scale for blocks in activation tensors. If not
            provided, `scale_rule` is used.
        dtype (`str`, default "nvfp4", *optional*, defaults to `"nvfp4"`):
            The data type to use for the layer's weights, activations, and tensors. Can be
            `"nvfp4"` or `"mxfp4"`.
        gradient_scale_rule (`str`, *optional*):
            Scaling rule to use when selecting a scale for blocks in gradient tensors. If not
            provided, `scale_rule` is used.
        keep_master_weights (`bool`, default False, *optional*, defaults to `False`):
            Whether to keep the master weights. If `True`, high-precision weights are kept at all
            times and weights are quantized online in each forward pass. This is useful for
            quantized training.
        matmul_backend (`str`, *optional*):
            The backend to use for matrix multiplications. Can be `"cutlass"` or `"pytorch"`. If
            not provided, CUTLASS will be used if available and PyTorch will be used otherwise.
        output_dtype (`str`, *optional*, defaults to `"bfloat16"`):
            The data type to use for the output of the layer. Can be `"bfloat16"` or `"float16"`.
        quantize_backend (`str`, *optional*):
            The backend to use for quantization. Can be `"cuda"`, `"triton"`, or `"pytorch"`. If
            not provided, the fastest backend will be selected based on your environment, and based
            on the options supported by each backend. Typically, `"cuda"` will be used for
            inference, `"triton"` will be used for training, and `"pytorch"` will be used on
            non-CUDA devices.
        scale_rule (`str`, default "mse", *optional*, defaults to `"mse"`):
            Rule to use when selecting block scales. Can be `"mse"`, `"mae"`, or `"abs_max"` for
            Four Over Six, `"static_6"` for default NVFP4 quantization, or `"static_4"` to scale
            all blocks to a maximum value of 4.
        weight_scale_2d (`bool`, default False, *optional*, defaults to `False`):
            Whether to compute scale factors on weight tensors in 2D blocks. This should be done
            during training.
        weight_scale_rule (`str`, *optional*):
            Scaling rule to use when selecting a scale for blocks in weight tensors. If not
            provided, `scale_rule` is used.
        module_config_overrides (`dict[str, dict[str, Any]]`, *optional*):
            A dictionary of module-specific configuration overrides. Keys should be module names, and
            values should be dictionaries containing the quantization configuration for that module.
            This can be used to override the default configuration for specific modules.
        modules_to_not_convert (`list[str]`, *optional*, defaults to `['lm_head']`):
            The list of modules to exclude from quantization. By default, the `lm_head` is excluded.
    """

    def __init__(
        self,
        activation_scale_rule: str | None = None,
        dtype: str = "nvfp4",
        gradient_scale_rule: str | None = None,
        keep_master_weights: bool = False,
        matmul_backend: str | None = None,
        output_dtype: str | None = "bfloat16",
        quantize_backend: str | None = None,
        scale_rule: str = "mse",
        weight_scale_2d: bool = False,
        weight_scale_rule: str | None = None,
        module_config_overrides: dict[str, dict[str, Any]] | None = None,
        modules_to_not_convert: list[str] | None = ["lm_head"],
        **kwargs,
    ):
        self.quant_method = QuantizationMethod.FOUR_OVER_SIX

        self.activation_scale_rule = activation_scale_rule
        self.dtype = dtype
        self.gradient_scale_rule = gradient_scale_rule
        self.keep_master_weights = keep_master_weights
        self.matmul_backend = matmul_backend
        self.quantize_backend = quantize_backend
        self.output_dtype = output_dtype
        self.scale_rule = scale_rule
        self.weight_scale_2d = weight_scale_2d
        self.weight_scale_rule = weight_scale_rule
        self.module_config_overrides = module_config_overrides
        self.modules_to_not_convert = modules_to_not_convert


class SinqConfig(QuantizationConfigMixin):
    """
    Quantization config for SINQ / A-SINQ.

    Pass this to:

        AutoModel.from_pretrained(..., quantization_config=SinqConfig(...))

    Args:
        nbits (`int`, default 4):
            Quantization bits for weights.
        group_size (`int`, default 64):
            Group size used in SINQ weight quantization (must be multiple of 8).
        tiling_mode (`str`, default "1D"):
            Tiling mode for SINQ (typically "1D"; "2D" if supported in your backend).
        method (`str`, default "sinq"):
            "sinq"  – calibration-free weight-only SINQ
            "asinq" – A-SINQ (activation-aware), not supported in Hugging Face. Please refer to the official SINQ repository.
        modules_to_not_convert (`list[str]`, *optional*):
            List of module names/prefixes to keep in full precision.

        **kwargs:
            Extra user arguments (kept in `_extra_kwargs` for round-tripping).
    """

    def __init__(
        self,
        nbits: int = 4,
        group_size: int = 64,
        tiling_mode: str = "1D",
        method: str = "sinq",  # "sinq" | "asinq"
        modules_to_not_convert: list[str] | None = None,
        **kwargs: Any,
    ):
        self.quant_method = QuantizationMethod.SINQ

        self.nbits = nbits
        self.group_size = group_size
        self.tiling_mode = tiling_mode
        self.method = method

        self.modules_to_not_convert = modules_to_not_convert

        self._extra_kwargs: dict[str, Any] = dict(kwargs)

        self.post_init()

    def post_init(self):
        self.nbits = int(self.nbits)
        self.group_size = int(self.group_size)
        self.tiling_mode = str(self.tiling_mode)
        self.method = str(self.method).lower()

        # Validation
        if not isinstance(self.nbits, int):
            raise TypeError("`nbits` must be convertible to an int")
        if not isinstance(self.group_size, int):
            raise TypeError("`group_size` must be convertible to an int")
        if not isinstance(self.tiling_mode, str):
            raise TypeError("`tiling_mode` must be convertible to a string")
        if self.method not in {"sinq", "asinq"}:
            raise ValueError(f"`method` must be either 'sinq' or 'asinq', got {self.method}")
        if self.group_size is not None and self.group_size % 8 != 0:
            logger.warning(
                f"SINQ: group_size={self.group_size} is not a multiple of 8; this may be rejected by the backend."
            )
