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+ # coding=utf-8
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+ # Copyright 2018 The Google AI Language Team Authors and The HuggingFace Inc. team.
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+ # Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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+ #
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+ # Licensed under the Apache License, Version 2.0 (the "License");
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+ # you may not use this file except in compliance with the License.
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+ # You may obtain a copy of the License at
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+ #
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+ # http://www.apache.org/licenses/LICENSE-2.0
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+ #
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+ # Unless required by applicable law or agreed to in writing, software
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+ # distributed under the License is distributed on an "AS IS" BASIS,
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+ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ # See the License for the specific language governing permissions and
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+ # limitations under the License.
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+ """ RoBERTa configuration"""
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+ from collections import OrderedDict
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+ from typing import Mapping
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+
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+ from transformers import PretrainedConfig
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+ from transformers.onnx import OnnxConfig
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+ from transformers.utils import logging
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+
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+
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+ logger = logging.get_logger(__name__)
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+
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+
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+ class RobertaConfig(PretrainedConfig):
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+ r"""
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+ This is the configuration class to store the configuration of a [`RobertaModel`] or a [`TFRobertaModel`]. It is
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+ used to instantiate a RoBERTa model according to the specified arguments, defining the model architecture.
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+ Instantiating a configuration with the defaults will yield a similar configuration to that of the RoBERTa
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+ [FacebookAI/roberta-base](https://huggingface.co/FacebookAI/roberta-base) architecture.
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+
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+ Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
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+ documentation from [`PretrainedConfig`] for more information.
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+
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+
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+ Args:
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+ vocab_size (`int`, *optional*, defaults to 50265):
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+ Vocabulary size of the RoBERTa model. Defines the number of different tokens that can be represented by the
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+ `inputs_ids` passed when calling [`RobertaModel`] or [`TFRobertaModel`].
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+ hidden_size (`int`, *optional*, defaults to 768):
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+ Dimensionality of the encoder layers and the pooler layer.
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+ num_hidden_layers (`int`, *optional*, defaults to 12):
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+ Number of hidden layers in the Transformer encoder.
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+ num_attention_heads (`int`, *optional*, defaults to 12):
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+ Number of attention heads for each attention layer in the Transformer encoder.
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+ intermediate_size (`int`, *optional*, defaults to 3072):
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+ Dimensionality of the "intermediate" (often named feed-forward) layer in the Transformer encoder.
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+ hidden_act (`str` or `Callable`, *optional*, defaults to `"gelu"`):
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+ The non-linear activation function (function or string) in the encoder and pooler. If string, `"gelu"`,
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+ `"relu"`, `"silu"` and `"gelu_new"` are supported.
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+ hidden_dropout_prob (`float`, *optional*, defaults to 0.1):
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+ The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
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+ attention_probs_dropout_prob (`float`, *optional*, defaults to 0.1):
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+ The dropout ratio for the attention probabilities.
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+ max_position_embeddings (`int`, *optional*, defaults to 512):
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+ The maximum sequence length that this model might ever be used with. Typically set this to something large
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+ just in case (e.g., 512 or 1024 or 2048).
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+ type_vocab_size (`int`, *optional*, defaults to 2):
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+ The vocabulary size of the `token_type_ids` passed when calling [`RobertaModel`] or [`TFRobertaModel`].
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+ initializer_range (`float`, *optional*, defaults to 0.02):
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+ The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
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+ layer_norm_eps (`float`, *optional*, defaults to 1e-12):
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+ The epsilon used by the layer normalization layers.
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+ position_embedding_type (`str`, *optional*, defaults to `"absolute"`):
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+ Type of position embedding. Choose one of `"absolute"`, `"relative_key"`, `"relative_key_query"`. For
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+ positional embeddings use `"absolute"`. For more information on `"relative_key"`, please refer to
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+ [Self-Attention with Relative Position Representations (Shaw et al.)](https://arxiv.org/abs/1803.02155).
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+ For more information on `"relative_key_query"`, please refer to *Method 4* in [Improve Transformer Models
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+ with Better Relative Position Embeddings (Huang et al.)](https://arxiv.org/abs/2009.13658).
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+ is_decoder (`bool`, *optional*, defaults to `False`):
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+ Whether the model is used as a decoder or not. If `False`, the model is used as an encoder.
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+ use_cache (`bool`, *optional*, defaults to `True`):
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+ Whether or not the model should return the last key/values attentions (not used by all models). Only
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+ relevant if `config.is_decoder=True`.
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+ classifier_dropout (`float`, *optional*):
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+ The dropout ratio for the classification head.
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+
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+ Examples:
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+
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+ ```python
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+ >>> from transformers import RobertaConfig, RobertaModel
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+
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+ >>> # Initializing a RoBERTa configuration
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+ >>> configuration = RobertaConfig()
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+
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+ >>> # Initializing a model (with random weights) from the configuration
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+ >>> model = RobertaModel(configuration)
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+
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+ >>> # Accessing the model configuration
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+ >>> configuration = model.config
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+ ```"""
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+
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+ model_type = "roberta"
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+
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+ def __init__(
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+ self,
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+ vocab_size=50265,
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+ hidden_size=768,
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+ num_hidden_layers=12,
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+ num_attention_heads=12,
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+ intermediate_size=3072,
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+ hidden_act="gelu",
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+ hidden_dropout_prob=0.1,
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+ attention_probs_dropout_prob=0.1,
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+ max_position_embeddings=512,
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+ type_vocab_size=2,
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+ initializer_range=0.02,
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+ layer_norm_eps=1e-12,
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+ pad_token_id=1,
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+ bos_token_id=0,
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+ eos_token_id=2,
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+ position_embedding_type="absolute",
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+ use_cache=True,
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+ classifier_dropout=None,
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+ **kwargs,
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+ ):
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+ super().__init__(pad_token_id=pad_token_id, bos_token_id=bos_token_id, eos_token_id=eos_token_id, **kwargs)
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+
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+ self.vocab_size = vocab_size
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+ self.hidden_size = hidden_size
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+ self.num_hidden_layers = num_hidden_layers
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+ self.num_attention_heads = num_attention_heads
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+ self.hidden_act = hidden_act
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+ self.intermediate_size = intermediate_size
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+ self.hidden_dropout_prob = hidden_dropout_prob
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+ self.attention_probs_dropout_prob = attention_probs_dropout_prob
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+ self.max_position_embeddings = max_position_embeddings
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+ self.type_vocab_size = type_vocab_size
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+ self.initializer_range = initializer_range
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+ self.layer_norm_eps = layer_norm_eps
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+ self.position_embedding_type = position_embedding_type
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+ self.use_cache = use_cache
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+ self.classifier_dropout = classifier_dropout
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+
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+
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+ class RobertaOnnxConfig(OnnxConfig):
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+ @property
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+ def inputs(self) -> Mapping[str, Mapping[int, str]]:
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+ if self.task == "multiple-choice":
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+ dynamic_axis = {0: "batch", 1: "choice", 2: "sequence"}
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+ else:
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+ dynamic_axis = {0: "batch", 1: "sequence"}
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+ return OrderedDict(
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+ [
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+ ("input_ids", dynamic_axis),
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+ ("attention_mask", dynamic_axis),
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+ ]
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+ )