111 lines
4.6 KiB
Python
111 lines
4.6 KiB
Python
from dataclasses import dataclass
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from typing import Optional, Tuple
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import torch
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from torch import nn
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from transformers import RobertaPreTrainedModel, XLMRobertaConfig, XLMRobertaModel
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from transformers.utils import ModelOutput
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@dataclass
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class TransformationModelOutput(ModelOutput):
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"""
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Base class for text model's outputs that also contains a pooling of the last hidden states.
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Args:
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text_embeds (`torch.FloatTensor` of shape `(batch_size, output_dim)` *optional* returned when model is initialized with `with_projection=True`):
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The text embeddings obtained by applying the projection layer to the pooler_output.
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last_hidden_state (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`):
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Sequence of hidden-states at the output of the last layer of the model.
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hidden_states (`tuple(torch.FloatTensor)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`):
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Tuple of `torch.FloatTensor` (one for the output of the embeddings, if the model has an embedding layer, +
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one for the output of each layer) of shape `(batch_size, sequence_length, hidden_size)`.
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Hidden-states of the model at the output of each layer plus the optional initial embedding outputs.
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attentions (`tuple(torch.FloatTensor)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`):
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Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, sequence_length,
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sequence_length)`.
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Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
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heads.
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"""
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projection_state: Optional[torch.FloatTensor] = None
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last_hidden_state: torch.FloatTensor = None
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hidden_states: Optional[Tuple[torch.FloatTensor]] = None
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attentions: Optional[Tuple[torch.FloatTensor]] = None
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class RobertaSeriesConfig(XLMRobertaConfig):
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def __init__(
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self,
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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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project_dim=512,
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pooler_fn="cls",
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learn_encoder=False,
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use_attention_mask=True,
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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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self.project_dim = project_dim
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self.pooler_fn = pooler_fn
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self.learn_encoder = learn_encoder
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self.use_attention_mask = use_attention_mask
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class RobertaSeriesModelWithTransformation(RobertaPreTrainedModel):
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_keys_to_ignore_on_load_unexpected = [r"pooler"]
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_keys_to_ignore_on_load_missing = [r"position_ids", r"predictions.decoder.bias"]
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base_model_prefix = "roberta"
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config_class = RobertaSeriesConfig
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def __init__(self, config):
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super().__init__(config)
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self.roberta = XLMRobertaModel(config)
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self.transformation = nn.Linear(config.hidden_size, config.project_dim)
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self.post_init()
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def forward(
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self,
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input_ids: Optional[torch.Tensor] = None,
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attention_mask: Optional[torch.Tensor] = None,
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token_type_ids: Optional[torch.Tensor] = None,
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position_ids: Optional[torch.Tensor] = None,
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head_mask: Optional[torch.Tensor] = None,
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inputs_embeds: Optional[torch.Tensor] = None,
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encoder_hidden_states: Optional[torch.Tensor] = None,
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encoder_attention_mask: Optional[torch.Tensor] = None,
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output_attentions: Optional[bool] = None,
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return_dict: Optional[bool] = None,
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output_hidden_states: Optional[bool] = None,
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):
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r""" """
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return_dict = return_dict if return_dict is not None else self.config.use_return_dict
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outputs = self.base_model(
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input_ids=input_ids,
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attention_mask=attention_mask,
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token_type_ids=token_type_ids,
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position_ids=position_ids,
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head_mask=head_mask,
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inputs_embeds=inputs_embeds,
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encoder_hidden_states=encoder_hidden_states,
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encoder_attention_mask=encoder_attention_mask,
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output_attentions=output_attentions,
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output_hidden_states=output_hidden_states,
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return_dict=return_dict,
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)
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projection_state = self.transformation(outputs.last_hidden_state)
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return TransformationModelOutput(
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projection_state=projection_state,
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last_hidden_state=outputs.last_hidden_state,
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hidden_states=outputs.hidden_states,
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attentions=outputs.attentions,
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)
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