# coding=utf-8
# Copyright Google AI and The HuggingFace Inc. team. 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
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# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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""" CANINE model configuration """

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


logger = logging.get_logger(__name__)

CANINE_PRETRAINED_CONFIG_ARCHIVE_MAP = {
    "google/canine-s": "https://huggingface.co/google/canine-s/resolve/main/config.json",
    # See all CANINE models at https://huggingface.co/models?filter=canine
}


class CanineConfig(PretrainedConfig):
    r"""
    This is the configuration class to store the configuration of a :class:`~transformers.CanineModel`. It is used to
    instantiate an CANINE 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 CANINE `google/canine-s
    <https://huggingface.co/google/canine-s>`__ 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:
        hidden_size (:obj:`int`, `optional`, defaults to 768):
            Dimension of the encoder layers and the pooler layer.
        num_hidden_layers (:obj:`int`, `optional`, defaults to 12):
            Number of hidden layers in the deep Transformer encoder.
        num_attention_heads (:obj:`int`, `optional`, defaults to 12):
            Number of attention heads for each attention layer in the Transformer encoders.
        intermediate_size (:obj:`int`, `optional`, defaults to 3072):
            Dimension of the "intermediate" (i.e., feed-forward) layer in the Transformer encoders.
        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 0.1):
            The dropout probabilitiy for all fully connected layers in the embeddings, encoders, 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 16384):
            The maximum sequence length that this model might ever be used with.
        type_vocab_size (:obj:`int`, `optional`, defaults to 16):
            The vocabulary size of the :obj:`token_type_ids` passed when calling :class:`~transformers.CanineModel`.
        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.
        gradient_checkpointing (:obj:`bool`, `optional`, defaults to :obj:`False`):
            If :obj:`True`, use gradient checkpointing to save memory at the expense of slower backward pass.
        downsampling_rate (:obj:`int`, `optional`, defaults to 4):
            The rate at which to downsample the original character sequence length before applying the deep Transformer
            encoder.
        upsampling_kernel_size (:obj:`int`, `optional`, defaults to 4):
            The kernel size (i.e. the number of characters in each window) of the convolutional projection layer when
            projecting back from :obj:`hidden_size`*2 to :obj:`hidden_size`.
        num_hash_functions (:obj:`int`, `optional`, defaults to 8):
            The number of hash functions to use. Each hash function has its own embedding matrix.
        num_hash_buckets (:obj:`int`, `optional`, defaults to 16384):
            The number of hash buckets to use.
        local_transformer_stride (:obj:`int`, `optional`, defaults to 128):
            The stride of the local attention of the first shallow Transformer encoder. Defaults to 128 for good
            TPU/XLA memory alignment.

    Example::

        >>> from transformers import CanineModel, CanineConfig

        >>> # Initializing a CANINE google/canine-s style configuration
        >>> configuration = CanineConfig()

        >>> # Initializing a model from the google/canine-s style configuration
        >>> model = CanineModel(configuration)

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

    def __init__(
        self,
        hidden_size=768,
        num_hidden_layers=12,
        num_attention_heads=12,
        intermediate_size=3072,
        hidden_act="gelu",
        hidden_dropout_prob=0.1,
        attention_probs_dropout_prob=0.1,
        max_position_embeddings=16384,
        type_vocab_size=16,
        initializer_range=0.02,
        layer_norm_eps=1e-12,
        use_cache=True,
        is_encoder_decoder=False,
        pad_token_id=0,
        bos_token_id=0xE000,
        eos_token_id=0xE001,
        downsampling_rate=4,
        upsampling_kernel_size=4,
        num_hash_functions=8,
        num_hash_buckets=16384,
        local_transformer_stride=128,  # Good TPU/XLA memory alignment.
        **kwargs
    ):
        super().__init__(pad_token_id=pad_token_id, bos_token_id=bos_token_id, eos_token_id=eos_token_id, **kwargs)

        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.initializer_range = initializer_range
        self.type_vocab_size = type_vocab_size
        self.layer_norm_eps = layer_norm_eps
        self.use_cache = use_cache

        # Character config:
        self.downsampling_rate = downsampling_rate
        self.upsampling_kernel_size = upsampling_kernel_size
        self.num_hash_functions = num_hash_functions
        self.num_hash_buckets = num_hash_buckets
        self.local_transformer_stride = local_transformer_stride
