# coding=utf-8
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""" XLM configuration """
from ...configuration_utils import PretrainedConfig
from ...utils import logging
logger = logging.get_logger(__name__)
XLM_PRETRAINED_CONFIG_ARCHIVE_MAP = {
"xlm-mlm-en-2048": "https://huggingface.co/xlm-mlm-en-2048/resolve/main/config.json",
"xlm-mlm-ende-1024": "https://huggingface.co/xlm-mlm-ende-1024/resolve/main/config.json",
"xlm-mlm-enfr-1024": "https://huggingface.co/xlm-mlm-enfr-1024/resolve/main/config.json",
"xlm-mlm-enro-1024": "https://huggingface.co/xlm-mlm-enro-1024/resolve/main/config.json",
"xlm-mlm-tlm-xnli15-1024": "https://huggingface.co/xlm-mlm-tlm-xnli15-1024/resolve/main/config.json",
"xlm-mlm-xnli15-1024": "https://huggingface.co/xlm-mlm-xnli15-1024/resolve/main/config.json",
"xlm-clm-enfr-1024": "https://huggingface.co/xlm-clm-enfr-1024/resolve/main/config.json",
"xlm-clm-ende-1024": "https://huggingface.co/xlm-clm-ende-1024/resolve/main/config.json",
"xlm-mlm-17-1280": "https://huggingface.co/xlm-mlm-17-1280/resolve/main/config.json",
"xlm-mlm-100-1280": "https://huggingface.co/xlm-mlm-100-1280/resolve/main/config.json",
}
[docs]class XLMConfig(PretrainedConfig):
"""
This is the configuration class to store the configuration of a :class:`~transformers.XLMModel` or a
:class:`~transformers.TFXLMModel`. It is used to instantiate a XLM 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 `xlm-mlm-en-2048 <https://huggingface.co/xlm-mlm-en-2048>`__ 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 30145):
Vocabulary size of the BERT model. Defines the number of different tokens that can be represented by the
:obj:`inputs_ids` passed when calling :class:`~transformers.XLMModel` or :class:`~transformers.TFXLMModel`.
emb_dim (:obj:`int`, `optional`, defaults to 2048):
Dimensionality of the encoder layers and the pooler layer.
n_layer (:obj:`int`, `optional`, defaults to 12):
Number of hidden layers in the Transformer encoder.
n_head (:obj:`int`, `optional`, defaults to 16):
Number of attention heads for each attention layer in the Transformer encoder.
dropout (:obj:`float`, `optional`, defaults to 0.1):
The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
attention_dropout (:obj:`float`, `optional`, defaults to 0.1):
The dropout probability for the attention mechanism
gelu_activation (:obj:`bool`, `optional`, defaults to :obj:`True`):
Whether or not to use `gelu` for the activations instead of `relu`.
sinusoidal_embeddings (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to use sinusoidal positional embeddings instead of absolute positional embeddings.
causal (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not the model should behave in a causal manner. Causal models use a triangular attention mask in
order to only attend to the left-side context instead if a bidirectional context.
asm (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to use an adaptive log softmax projection layer instead of a linear layer for the prediction
layer.
n_langs (:obj:`int`, `optional`, defaults to 1):
The number of languages the model handles. Set to 1 for monolingual models.
use_lang_emb (:obj:`bool`, `optional`, defaults to :obj:`True`)
Whether to use language embeddings. Some models use additional language embeddings, see `the multilingual
models page <http://huggingface.co/transformers/multilingual.html#xlm-language-embeddings>`__ for
information on how to use them.
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).
embed_init_std (:obj:`float`, `optional`, defaults to 2048^-0.5):
The standard deviation of the truncated_normal_initializer for initializing the embedding matrices.
init_std (:obj:`int`, `optional`, defaults to 50257):
The standard deviation of the truncated_normal_initializer for initializing all weight matrices except the
embedding matrices.
layer_norm_eps (:obj:`float`, `optional`, defaults to 1e-12):
The epsilon used by the layer normalization layers.
bos_index (:obj:`int`, `optional`, defaults to 0):
The index of the beginning of sentence token in the vocabulary.
eos_index (:obj:`int`, `optional`, defaults to 1):
The index of the end of sentence token in the vocabulary.
pad_index (:obj:`int`, `optional`, defaults to 2):
The index of the padding token in the vocabulary.
unk_index (:obj:`int`, `optional`, defaults to 3):
The index of the unknown token in the vocabulary.
mask_index (:obj:`int`, `optional`, defaults to 5):
The index of the masking token in the vocabulary.
is_encoder(:obj:`bool`, `optional`, defaults to :obj:`True`):
Whether or not the initialized model should be a transformer encoder or decoder as seen in Vaswani et al.
summary_type (:obj:`string`, `optional`, defaults to "first"):
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Has to be one of the following options:
- :obj:`"last"`: Take the last token hidden state (like XLNet).
- :obj:`"first"`: Take the first token hidden state (like BERT).
- :obj:`"mean"`: Take the mean of all tokens hidden states.
- :obj:`"cls_index"`: Supply a Tensor of classification token position (like GPT/GPT-2).
- :obj:`"attn"`: Not implemented now, use multi-head attention.
summary_use_proj (:obj:`bool`, `optional`, defaults to :obj:`True`):
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Whether or not to add a projection after the vector extraction.
summary_activation (:obj:`str`, `optional`):
Argument used when doing sequence summary. Used in the sequence classification and multiple choice models.
Pass :obj:`"tanh"` for a tanh activation to the output, any other value will result in no activation.
summary_proj_to_labels (:obj:`bool`, `optional`, defaults to :obj:`True`):
Used in the sequence classification and multiple choice models.
Whether the projection outputs should have :obj:`config.num_labels` or :obj:`config.hidden_size` classes.
summary_first_dropout (:obj:`float`, `optional`, defaults to 0.1):
Used in the sequence classification and multiple choice models.
The dropout ratio to be used after the projection and activation.
start_n_top (:obj:`int`, `optional`, defaults to 5):
Used in the SQuAD evaluation script.
end_n_top (:obj:`int`, `optional`, defaults to 5):
Used in the SQuAD evaluation script.
mask_token_id (:obj:`int`, `optional`, defaults to 0):
Model agnostic parameter to identify masked tokens when generating text in an MLM context.
lang_id (:obj:`int`, `optional`, defaults to 1):
The ID of the language used by the model. This parameter is used when generating text in a given language.
Examples::
>>> from transformers import XLMConfig, XLMModel
>>> # Initializing a XLM configuration
>>> configuration = XLMConfig()
>>> # Initializing a model from the configuration
>>> model = XLMModel(configuration)
>>> # Accessing the model configuration
>>> configuration = model.config
"""
model_type = "xlm"
def __init__(
self,
vocab_size=30145,
emb_dim=2048,
n_layers=12,
n_heads=16,
dropout=0.1,
attention_dropout=0.1,
gelu_activation=True,
sinusoidal_embeddings=False,
causal=False,
asm=False,
n_langs=1,
use_lang_emb=True,
max_position_embeddings=512,
embed_init_std=2048 ** -0.5,
layer_norm_eps=1e-12,
init_std=0.02,
bos_index=0,
eos_index=1,
pad_index=2,
unk_index=3,
mask_index=5,
is_encoder=True,
summary_type="first",
summary_use_proj=True,
summary_activation=None,
summary_proj_to_labels=True,
summary_first_dropout=0.1,
start_n_top=5,
end_n_top=5,
mask_token_id=0,
lang_id=0,
pad_token_id=2,
bos_token_id=0,
**kwargs
):
"""Constructs XLMConfig."""
super().__init__(pad_token_id=pad_token_id, bos_token_id=bos_token_id, **kwargs)
self.vocab_size = vocab_size
self.emb_dim = emb_dim
self.n_layers = n_layers
self.n_heads = n_heads
self.dropout = dropout
self.attention_dropout = attention_dropout
self.gelu_activation = gelu_activation
self.sinusoidal_embeddings = sinusoidal_embeddings
self.causal = causal
self.asm = asm
self.n_langs = n_langs
self.use_lang_emb = use_lang_emb
self.layer_norm_eps = layer_norm_eps
self.bos_index = bos_index
self.eos_index = eos_index
self.pad_index = pad_index
self.unk_index = unk_index
self.mask_index = mask_index
self.is_encoder = is_encoder
self.max_position_embeddings = max_position_embeddings
self.embed_init_std = embed_init_std
self.init_std = init_std
self.summary_type = summary_type
self.summary_use_proj = summary_use_proj
self.summary_activation = summary_activation
self.summary_proj_to_labels = summary_proj_to_labels
self.summary_first_dropout = summary_first_dropout
self.start_n_top = start_n_top
self.end_n_top = end_n_top
self.mask_token_id = mask_token_id
self.lang_id = lang_id
if "n_words" in kwargs:
self.n_words = kwargs["n_words"]
@property
def n_words(self): # For backward compatibility
return self.vocab_size
@n_words.setter
def n_words(self, value): # For backward compatibility
self.vocab_size = value
@property
def hidden_size(self):
return self.emb_dim
@property
def num_attention_heads(self):
return self.n_heads
@property
def num_hidden_layers(self):
return self.n_layers