# coding=utf-8
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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""" RemBERT model configuration """

from ...configuration_utils import PretrainedConfig
from ...utils import logging


logger = logging.get_logger(__name__)

REMBERT_PRETRAINED_CONFIG_ARCHIVE_MAP = {
    "rembert": "https://huggingface.co/google/rembert/resolve/main/config.json",
    # See all RemBERT models at https://huggingface.co/models?filter=rembert
}


class RemBertConfig(PretrainedConfig):
    r"""
    This is the configuration class to store the configuration of a :class:`~transformers.RemBertModel`. It is used to
    instantiate an RemBERT model according to the specified arguments, defining the model architecture. Instantiating a
    configuration with the defaults will yield a similar configuration to that of the remert-large architecture.

    Configuration objects inherit from :class:`~transformers.PretrainedConfig` and can be used to control the model
    outputs. Read the documentation from :class:`~transformers.PretrainedConfig` for more information.


    Args:
        vocab_size (:obj:`int`, `optional`, defaults to 250300):
            Vocabulary size of the RemBERT model. Defines the number of different tokens that can be represented by the
            :obj:`inputs_ids` passed when calling :class:`~transformers.RemBertModel` or
            :class:`~transformers.TFRemBertModel`. Vocabulary size of the model. Defines the different tokens that can
            be represented by the `inputs_ids` passed to the forward method of :class:`~transformers.RemBertModel`.
        hidden_size (:obj:`int`, `optional`, defaults to 1152):
            Dimensionality of the encoder layers and the pooler layer.
        num_hidden_layers (:obj:`int`, `optional`, defaults to 32):
            Number of hidden layers in the Transformer encoder.
        num_attention_heads (:obj:`int`, `optional`, defaults to 18):
            Number of attention heads for each attention layer in the Transformer encoder.
        input_embedding_size (:obj:`int`, `optional`, defaults to 256):
            Dimensionality of the input embeddings.
        output_embedding_size (:obj:`int`, `optional`, defaults to 1664):
            Dimensionality of the output embeddings.
        intermediate_size (:obj:`int`, `optional`, defaults to 4608):
            Dimensionality of the "intermediate" (i.e., feed-forward) layer in the Transformer encoder.
        hidden_act (:obj:`str` or :obj:`function`, `optional`, defaults to :obj:`"gelu"`):
            The non-linear activation function (function or string) in the encoder and pooler. If string,
            :obj:`"gelu"`, :obj:`"relu"`, :obj:`"selu"` and :obj:`"gelu_new"` are supported.
        hidden_dropout_prob (:obj:`float`, `optional`, defaults to 0):
            The dropout probabilitiy for all fully connected layers in the embeddings, encoder, and pooler.
        attention_probs_dropout_prob (:obj:`float`, `optional`, defaults to 0):
            The dropout ratio for the attention probabilities.
        classifier_dropout_prob (:obj:`float`, `optional`, defaults to 0.1):
            The dropout ratio for the classifier layer when fine-tuning.
        max_position_embeddings (:obj:`int`, `optional`, defaults to 512):
            The maximum sequence length that this model might ever be used with. Typically set this to something large
            just in case (e.g., 512 or 1024 or 2048).
        type_vocab_size (:obj:`int`, `optional`, defaults to 2):
            The vocabulary size of the :obj:`token_type_ids` passed when calling :class:`~transformers.RemBertModel` or
            :class:`~transformers.TFRemBertModel`.
        initializer_range (:obj:`float`, `optional`, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
        layer_norm_eps (:obj:`float`, `optional`, defaults to 1e-12):
            The epsilon used by the layer normalization layers.
        use_cache (:obj:`bool`, `optional`, defaults to :obj:`True`):
            Whether or not the model should return the last key/values attentions (not used by all models). Only
            relevant if ``config.is_decoder=True``.
        gradient_checkpointing (:obj:`bool`, `optional`, defaults to :obj:`False`):
            If True, use gradient checkpointing to save memory at the expense of slower backward pass.

        Example::

        >>> from transformers import RemBertModel, RemBertConfig
        >>> # Initializing a RemBERT rembert style configuration
        >>> configuration = RemBertConfig()

        >>> # Initializing a model from the rembert style configuration
        >>> model = RemBertModel(configuration)

        >>> # Accessing the model configuration
        >>> configuration = model.config
    """
    model_type = "rembert"

    def __init__(
        self,
        vocab_size=250300,
        hidden_size=1152,
        num_hidden_layers=32,
        num_attention_heads=18,
        input_embedding_size=256,
        output_embedding_size=1664,
        intermediate_size=4608,
        hidden_act="gelu",
        hidden_dropout_prob=0.0,
        attention_probs_dropout_prob=0.0,
        classifier_dropout_prob=0.1,
        max_position_embeddings=512,
        type_vocab_size=2,
        initializer_range=0.02,
        layer_norm_eps=1e-12,
        use_cache=True,
        is_encoder_decoder=False,
        pad_token_id=0,
        bos_token_id=312,
        eos_token_id=313,
        **kwargs
    ):
        super().__init__(pad_token_id=pad_token_id, bos_token_id=bos_token_id, eos_token_id=eos_token_id, **kwargs)

        self.vocab_size = vocab_size
        self.input_embedding_size = input_embedding_size
        self.output_embedding_size = output_embedding_size
        self.max_position_embeddings = max_position_embeddings
        self.hidden_size = hidden_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads
        self.intermediate_size = intermediate_size
        self.hidden_act = hidden_act
        self.hidden_dropout_prob = hidden_dropout_prob
        self.attention_probs_dropout_prob = attention_probs_dropout_prob
        self.classifier_dropout_prob = classifier_dropout_prob
        self.initializer_range = initializer_range
        self.type_vocab_size = type_vocab_size
        self.layer_norm_eps = layer_norm_eps
        self.use_cache = use_cache
        self.tie_word_embeddings = False
