# coding=utf-8
# Copyright 2020 The HuggingFace Team. All rights reserved.
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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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""" MobileBERT model configuration """

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


logger = logging.get_logger(__name__)

MOBILEBERT_PRETRAINED_CONFIG_ARCHIVE_MAP = {
    "mobilebert-uncased": "https://huggingface.co/google/mobilebert-uncased/resolve/main/config.json"
}


class MobileBertConfig(PretrainedConfig):
    r"""
    This is the configuration class to store the configuration of a :class:`~transformers.MobileBertModel` or a
    :class:`~transformers.TFMobileBertModel`. It is used to instantiate a MobileBERT model according to the specified
    arguments, defining the model 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 30522):
            Vocabulary size of the MobileBERT model. Defines the number of different tokens that can be represented by
            the :obj:`inputs_ids` passed when calling :class:`~transformers.MobileBertModel` or
            :class:`~transformers.TFMobileBertModel`.
        hidden_size (:obj:`int`, `optional`, defaults to 512):
            Dimensionality of the encoder layers and the pooler layer.
        num_hidden_layers (:obj:`int`, `optional`, defaults to 24):
            Number of hidden layers in the Transformer encoder.
        num_attention_heads (:obj:`int`, `optional`, defaults to 4):
            Number of attention heads for each attention layer in the Transformer encoder.
        intermediate_size (:obj:`int`, `optional`, defaults to 512):
            Dimensionality of the "intermediate" (often named feed-forward) layer in the Transformer encoder.
        hidden_act (:obj:`str` or :obj:`function`, `optional`, defaults to :obj:`"relu"`):
            The non-linear activation function (function or string) in the encoder and pooler. If string,
            :obj:`"gelu"`, :obj:`"relu"`, :obj:`"silu"` and :obj:`"gelu_new"` are supported.
        hidden_dropout_prob (:obj:`float`, `optional`, defaults to 0.0):
            The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
        attention_probs_dropout_prob (:obj:`float`, `optional`, defaults to 0.1):
            The dropout ratio for the attention probabilities.
        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.MobileBertModel`
            or :class:`~transformers.TFMobileBertModel`.
        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.

        pad_token_id (:obj:`int`, `optional`, defaults to 0):
            The ID of the token in the word embedding to use as padding.
        embedding_size (:obj:`int`, `optional`, defaults to 128):
            The dimension of the word embedding vectors.
        trigram_input (:obj:`bool`, `optional`, defaults to :obj:`True`):
            Use a convolution of trigram as input.
        use_bottleneck (:obj:`bool`, `optional`, defaults to :obj:`True`):
            Whether to use bottleneck in BERT.
        intra_bottleneck_size (:obj:`int`, `optional`, defaults to 128):
            Size of bottleneck layer output.
        use_bottleneck_attention (:obj:`bool`, `optional`, defaults to :obj:`False`):
            Whether to use attention inputs from the bottleneck transformation.
        key_query_shared_bottleneck (:obj:`bool`, `optional`, defaults to :obj:`True`):
            Whether to use the same linear transformation for query&key in the bottleneck.
        num_feedforward_networks (:obj:`int`, `optional`, defaults to 4):
            Number of FFNs in a block.
        normalization_type (:obj:`str`, `optional`, defaults to :obj:`"no_norm"`):
            The normalization type in MobileBERT.
        classifier_dropout (:obj:`float`, `optional`):
            The dropout ratio for the classification head.

    Examples::

        >>> from transformers import MobileBertModel, MobileBertConfig

        >>> # Initializing a MobileBERT configuration
        >>> configuration = MobileBertConfig()

        >>> # Initializing a model from the configuration above
        >>> model = MobileBertModel(configuration)

        >>> # Accessing the model configuration
        >>> configuration = model.config

    Attributes: pretrained_config_archive_map (Dict[str, str]): A dictionary containing all the available pre-trained
    checkpoints.
    """
    pretrained_config_archive_map = MOBILEBERT_PRETRAINED_CONFIG_ARCHIVE_MAP
    model_type = "mobilebert"

    def __init__(
        self,
        vocab_size=30522,
        hidden_size=512,
        num_hidden_layers=24,
        num_attention_heads=4,
        intermediate_size=512,
        hidden_act="relu",
        hidden_dropout_prob=0.0,
        attention_probs_dropout_prob=0.1,
        max_position_embeddings=512,
        type_vocab_size=2,
        initializer_range=0.02,
        layer_norm_eps=1e-12,
        pad_token_id=0,
        embedding_size=128,
        trigram_input=True,
        use_bottleneck=True,
        intra_bottleneck_size=128,
        use_bottleneck_attention=False,
        key_query_shared_bottleneck=True,
        num_feedforward_networks=4,
        normalization_type="no_norm",
        classifier_activation=True,
        classifier_dropout=None,
        **kwargs
    ):
        super().__init__(pad_token_id=pad_token_id, **kwargs)

        self.vocab_size = vocab_size
        self.hidden_size = hidden_size
        self.num_hidden_layers = num_hidden_layers
        self.num_attention_heads = num_attention_heads
        self.hidden_act = hidden_act
        self.intermediate_size = intermediate_size
        self.hidden_dropout_prob = hidden_dropout_prob
        self.attention_probs_dropout_prob = attention_probs_dropout_prob
        self.max_position_embeddings = max_position_embeddings
        self.type_vocab_size = type_vocab_size
        self.initializer_range = initializer_range
        self.layer_norm_eps = layer_norm_eps
        self.embedding_size = embedding_size
        self.trigram_input = trigram_input
        self.use_bottleneck = use_bottleneck
        self.intra_bottleneck_size = intra_bottleneck_size
        self.use_bottleneck_attention = use_bottleneck_attention
        self.key_query_shared_bottleneck = key_query_shared_bottleneck
        self.num_feedforward_networks = num_feedforward_networks
        self.normalization_type = normalization_type
        self.classifier_activation = classifier_activation

        if self.use_bottleneck:
            self.true_hidden_size = intra_bottleneck_size
        else:
            self.true_hidden_size = hidden_size

        self.classifier_dropout = classifier_dropout
