src/transformers/configuration_roberta.py

# coding=utf-8
# Copyright 2018 The Google AI Language Team Authors and The HuggingFace Inc. team.
# Copyright (c) 2018, NVIDIA CORPORATION.  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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# distributed under the License is distributed on an "AS IS" BASIS,
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""" RoBERTa configuration """


import logging

from .configuration_bert import BertConfig


logger = logging.getLogger(__name__)

ROBERTA_PRETRAINED_CONFIG_ARCHIVE_MAP = {
    "roberta-base": "https://s3.amazonaws.com/models.huggingface.co/bert/roberta-base-config.json",
    "roberta-large": "https://s3.amazonaws.com/models.huggingface.co/bert/roberta-large-config.json",
    "roberta-large-mnli": "https://s3.amazonaws.com/models.huggingface.co/bert/roberta-large-mnli-config.json",
    "distilroberta-base": "https://s3.amazonaws.com/models.huggingface.co/bert/distilroberta-base-config.json",
    "roberta-base-openai-detector": "https://s3.amazonaws.com/models.huggingface.co/bert/roberta-base-openai-detector-config.json",
    "roberta-large-openai-detector": "https://s3.amazonaws.com/models.huggingface.co/bert/roberta-large-openai-detector-config.json",
}


class RobertaConfig(BertConfig):
    r"""
        This is the configuration class to store the configuration of an :class:`~transformers.RobertaModel`.
        It is used to instantiate an RoBERTa 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 BERT `bert-base-uncased <https://huggingface.co/bert-base-uncased>`__ 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.

        The :class:`~transformers.RobertaConfig` class directly inherits :class:`~transformers.BertConfig`.
        It reuses the same defaults. Please check the parent class for more information.

        Example::

            from transformers import RobertaConfig, RobertaModel

            # Initializing a RoBERTa configuration
            configuration = RobertaConfig()

            # Initializing a model from the configuration
            model = RobertaModel(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 = ROBERTA_PRETRAINED_CONFIG_ARCHIVE_MAP
    model_type = "roberta"