1638 lines
71 KiB
Python
1638 lines
71 KiB
Python
# coding=utf-8
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# Copyright 2021 The Fairseq Authors and the HuggingFace Inc. team. 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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""" PyTorch UniSpeech model."""
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import math
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import warnings
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from dataclasses import dataclass
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from typing import Optional, Tuple, Union
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import numpy as np
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import torch
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import torch.utils.checkpoint
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from torch import nn
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from torch.nn import CrossEntropyLoss
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from ...activations import ACT2FN
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from ...integrations.deepspeed import is_deepspeed_zero3_enabled
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from ...modeling_outputs import BaseModelOutput, CausalLMOutput, SequenceClassifierOutput, Wav2Vec2BaseModelOutput
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from ...modeling_utils import PreTrainedModel
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from ...utils import (
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ModelOutput,
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add_code_sample_docstrings,
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add_start_docstrings,
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add_start_docstrings_to_model_forward,
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logging,
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replace_return_docstrings,
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)
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from .configuration_unispeech import UniSpeechConfig
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logger = logging.get_logger(__name__)
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_HIDDEN_STATES_START_POSITION = 2
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# General docstring
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_CONFIG_FOR_DOC = "UniSpeechConfig"
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# Base docstring
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_CHECKPOINT_FOR_DOC = "patrickvonplaten/unispeech-large-1500h-cv-timit"
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_EXPECTED_OUTPUT_SHAPE = [1, 292, 1024]
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# CTC docstring
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_CTC_EXPECTED_OUTPUT = "'mister quilter is the apposl of the midle classes and weare glad to welcom his gosepl'"
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_CTC_EXPECTED_LOSS = 17.17
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from ..deprecated._archive_maps import UNISPEECH_PRETRAINED_MODEL_ARCHIVE_LIST # noqa: F401, E402
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@dataclass
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class UniSpeechForPreTrainingOutput(ModelOutput):
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"""
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Output type of [`UniSpeechForPreTrainingOutput`], with potential hidden states and attentions.
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Args:
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loss (*optional*, returned when model is in train mode, `torch.FloatTensor` of shape `(1,)`):
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Total loss as the sum of the contrastive loss (L_m) and the diversity loss (L_d) as stated in the [official
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paper](https://arxiv.org/pdf/2006.11477.pdf) . (classification) loss.
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projected_states (`torch.FloatTensor` of shape `(batch_size, sequence_length, config.proj_codevector_dim)`):
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Hidden-states of the model projected to *config.proj_codevector_dim* that can be used to predict the masked
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projected quantized states.
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projected_quantized_states (`torch.FloatTensor` of shape `(batch_size, sequence_length, config.proj_codevector_dim)`):
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Quantized extracted feature vectors projected to *config.proj_codevector_dim* representing the positive
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target vectors for contrastive loss.
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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 + one for the output of each layer) of
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shape `(batch_size, sequence_length, hidden_size)`.
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Hidden-states of the model at the output of each layer plus the 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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loss: Optional[torch.FloatTensor] = None
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projected_states: torch.FloatTensor = None
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projected_quantized_states: torch.FloatTensor = None
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codevector_perplexity: 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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# Copied from transformers.models.wav2vec2.modeling_wav2vec2._compute_mask_indices
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def _compute_mask_indices(
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shape: Tuple[int, int],
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mask_prob: float,
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mask_length: int,
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attention_mask: Optional[torch.LongTensor] = None,
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min_masks: int = 0,
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) -> np.ndarray:
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"""
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Computes random mask spans for a given shape. Used to implement [SpecAugment: A Simple Data Augmentation Method for
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ASR](https://arxiv.org/abs/1904.08779). Note that this method is not optimized to run on TPU and should be run on
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CPU as part of the preprocessing during training.
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Args:
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shape: The shape for which to compute masks. This should be of a tuple of size 2 where
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the first element is the batch size and the second element is the length of the axis to span.
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mask_prob: The percentage of the whole axis (between 0 and 1) which will be masked. The number of
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independently generated mask spans of length `mask_length` is computed by
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`mask_prob*shape[1]/mask_length`. Note that due to overlaps, `mask_prob` is an upper bound and the
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actual percentage will be smaller.
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mask_length: size of the mask
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min_masks: minimum number of masked spans
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attention_mask: A (right-padded) attention mask which independently shortens the feature axis of
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each batch dimension.
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"""
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batch_size, sequence_length = shape
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if mask_length < 1:
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raise ValueError("`mask_length` has to be bigger than 0.")
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if mask_length > sequence_length:
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raise ValueError(
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f"`mask_length` has to be smaller than `sequence_length`, but got `mask_length`: {mask_length}"
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f" and `sequence_length`: {sequence_length}`"
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)
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# epsilon is used for probabilistic rounding
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epsilon = np.random.rand(1).item()
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def compute_num_masked_span(input_length):
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"""Given input length, compute how many spans should be masked"""
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num_masked_span = int(mask_prob * input_length / mask_length + epsilon)
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num_masked_span = max(num_masked_span, min_masks)
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# make sure num masked span <= sequence_length
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if num_masked_span * mask_length > sequence_length:
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num_masked_span = sequence_length // mask_length
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# make sure num_masked span is also <= input_length - (mask_length - 1)
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if input_length - (mask_length - 1) < num_masked_span:
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num_masked_span = max(input_length - (mask_length - 1), 0)
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return num_masked_span
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# compute number of masked spans in batch
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input_lengths = (
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attention_mask.sum(-1).detach().tolist()
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if attention_mask is not None
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else [sequence_length for _ in range(batch_size)]
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)
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# SpecAugment mask to fill
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spec_aug_mask = np.zeros((batch_size, sequence_length), dtype=bool)
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spec_aug_mask_idxs = []
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max_num_masked_span = compute_num_masked_span(sequence_length)
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if max_num_masked_span == 0:
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return spec_aug_mask
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for input_length in input_lengths:
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# compute num of masked spans for this input
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num_masked_span = compute_num_masked_span(input_length)
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# get random indices to mask
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spec_aug_mask_idx = np.random.choice(
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np.arange(input_length - (mask_length - 1)), num_masked_span, replace=False
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)
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# pick first sampled index that will serve as a dummy index to pad vector
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# to ensure same dimension for all batches due to probabilistic rounding
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# Picking first sample just pads those vectors twice.
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if len(spec_aug_mask_idx) == 0:
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# this case can only happen if `input_length` is strictly smaller then
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# `sequence_length` in which case the last token has to be a padding
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# token which we can use as a dummy mask id
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dummy_mask_idx = sequence_length - 1
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else:
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dummy_mask_idx = spec_aug_mask_idx[0]
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spec_aug_mask_idx = np.concatenate(
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[spec_aug_mask_idx, np.ones(max_num_masked_span - num_masked_span, dtype=np.int32) * dummy_mask_idx]
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)
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spec_aug_mask_idxs.append(spec_aug_mask_idx)
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spec_aug_mask_idxs = np.array(spec_aug_mask_idxs)
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# expand masked indices to masked spans
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spec_aug_mask_idxs = np.broadcast_to(
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spec_aug_mask_idxs[:, :, None], (batch_size, max_num_masked_span, mask_length)
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)
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spec_aug_mask_idxs = spec_aug_mask_idxs.reshape(batch_size, max_num_masked_span * mask_length)
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# add offset to the starting indexes so that indexes now create a span
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offsets = np.arange(mask_length)[None, None, :]
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offsets = np.broadcast_to(offsets, (batch_size, max_num_masked_span, mask_length)).reshape(
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batch_size, max_num_masked_span * mask_length
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)
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spec_aug_mask_idxs = spec_aug_mask_idxs + offsets
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# ensure that we cannot have indices larger than sequence_length
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if spec_aug_mask_idxs.max() > sequence_length - 1:
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spec_aug_mask_idxs[spec_aug_mask_idxs > sequence_length - 1] = sequence_length - 1
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# scatter indices to mask
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np.put_along_axis(spec_aug_mask, spec_aug_mask_idxs, 1, -1)
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return spec_aug_mask
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2NoLayerNormConvLayer with Wav2Vec2->UniSpeech
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class UniSpeechNoLayerNormConvLayer(nn.Module):
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def __init__(self, config, layer_id=0):
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super().__init__()
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self.in_conv_dim = config.conv_dim[layer_id - 1] if layer_id > 0 else 1
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self.out_conv_dim = config.conv_dim[layer_id]
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self.conv = nn.Conv1d(
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self.in_conv_dim,
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self.out_conv_dim,
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kernel_size=config.conv_kernel[layer_id],
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stride=config.conv_stride[layer_id],
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bias=config.conv_bias,
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)
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self.activation = ACT2FN[config.feat_extract_activation]
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def forward(self, hidden_states):
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hidden_states = self.conv(hidden_states)
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hidden_states = self.activation(hidden_states)
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return hidden_states
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2LayerNormConvLayer with Wav2Vec2->UniSpeech
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class UniSpeechLayerNormConvLayer(nn.Module):
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def __init__(self, config, layer_id=0):
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super().__init__()
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self.in_conv_dim = config.conv_dim[layer_id - 1] if layer_id > 0 else 1
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self.out_conv_dim = config.conv_dim[layer_id]
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self.conv = nn.Conv1d(
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self.in_conv_dim,
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self.out_conv_dim,
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kernel_size=config.conv_kernel[layer_id],
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stride=config.conv_stride[layer_id],
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bias=config.conv_bias,
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)
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self.layer_norm = nn.LayerNorm(self.out_conv_dim, elementwise_affine=True)
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self.activation = ACT2FN[config.feat_extract_activation]
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def forward(self, hidden_states):
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hidden_states = self.conv(hidden_states)
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hidden_states = hidden_states.transpose(-2, -1)
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hidden_states = self.layer_norm(hidden_states)
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hidden_states = hidden_states.transpose(-2, -1)
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hidden_states = self.activation(hidden_states)
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return hidden_states
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2GroupNormConvLayer with Wav2Vec2->UniSpeech
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class UniSpeechGroupNormConvLayer(nn.Module):
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def __init__(self, config, layer_id=0):
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super().__init__()
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self.in_conv_dim = config.conv_dim[layer_id - 1] if layer_id > 0 else 1
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self.out_conv_dim = config.conv_dim[layer_id]
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self.conv = nn.Conv1d(
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self.in_conv_dim,
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self.out_conv_dim,
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kernel_size=config.conv_kernel[layer_id],
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stride=config.conv_stride[layer_id],
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bias=config.conv_bias,
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)
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self.activation = ACT2FN[config.feat_extract_activation]
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self.layer_norm = nn.GroupNorm(num_groups=self.out_conv_dim, num_channels=self.out_conv_dim, affine=True)
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def forward(self, hidden_states):
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hidden_states = self.conv(hidden_states)
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hidden_states = self.layer_norm(hidden_states)
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hidden_states = self.activation(hidden_states)
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return hidden_states
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2PositionalConvEmbedding with Wav2Vec2->UniSpeech
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class UniSpeechPositionalConvEmbedding(nn.Module):
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def __init__(self, config):
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super().__init__()
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self.conv = nn.Conv1d(
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config.hidden_size,
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config.hidden_size,
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kernel_size=config.num_conv_pos_embeddings,
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padding=config.num_conv_pos_embeddings // 2,
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groups=config.num_conv_pos_embedding_groups,
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)
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weight_norm = nn.utils.weight_norm
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if hasattr(nn.utils.parametrizations, "weight_norm"):
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weight_norm = nn.utils.parametrizations.weight_norm
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if is_deepspeed_zero3_enabled():
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import deepspeed
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with deepspeed.zero.GatheredParameters(self.conv.weight, modifier_rank=0):
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self.conv = weight_norm(self.conv, name="weight", dim=2)
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deepspeed.zero.register_external_parameter(self, self.conv.weight_v)
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deepspeed.zero.register_external_parameter(self, self.conv.weight_g)
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else:
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self.conv = weight_norm(self.conv, name="weight", dim=2)
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self.padding = UniSpeechSamePadLayer(config.num_conv_pos_embeddings)
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self.activation = ACT2FN[config.feat_extract_activation]
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def forward(self, hidden_states):
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hidden_states = hidden_states.transpose(1, 2)
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hidden_states = self.conv(hidden_states)
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hidden_states = self.padding(hidden_states)
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hidden_states = self.activation(hidden_states)
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hidden_states = hidden_states.transpose(1, 2)
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return hidden_states
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2SamePadLayer with Wav2Vec2->UniSpeech
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class UniSpeechSamePadLayer(nn.Module):
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def __init__(self, num_conv_pos_embeddings):
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super().__init__()
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self.num_pad_remove = 1 if num_conv_pos_embeddings % 2 == 0 else 0
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def forward(self, hidden_states):
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if self.num_pad_remove > 0:
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hidden_states = hidden_states[:, :, : -self.num_pad_remove]
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return hidden_states
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2FeatureEncoder with Wav2Vec2->UniSpeech
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class UniSpeechFeatureEncoder(nn.Module):
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"""Construct the features from raw audio waveform"""
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def __init__(self, config):
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super().__init__()
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if config.feat_extract_norm == "group":
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conv_layers = [UniSpeechGroupNormConvLayer(config, layer_id=0)] + [
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UniSpeechNoLayerNormConvLayer(config, layer_id=i + 1)
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for i in range(config.num_feat_extract_layers - 1)
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]
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elif config.feat_extract_norm == "layer":
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conv_layers = [
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UniSpeechLayerNormConvLayer(config, layer_id=i) for i in range(config.num_feat_extract_layers)
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]
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else:
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raise ValueError(
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f"`config.feat_extract_norm` is {config.feat_extract_norm}, but has to be one of ['group', 'layer']"
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)
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self.conv_layers = nn.ModuleList(conv_layers)
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self.gradient_checkpointing = False
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self._requires_grad = True
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def _freeze_parameters(self):
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for param in self.parameters():
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param.requires_grad = False
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self._requires_grad = False
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def forward(self, input_values):
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hidden_states = input_values[:, None]
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# make sure hidden_states require grad for gradient_checkpointing
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if self._requires_grad and self.training:
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hidden_states.requires_grad = True
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for conv_layer in self.conv_layers:
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if self._requires_grad and self.gradient_checkpointing and self.training:
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hidden_states = self._gradient_checkpointing_func(
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conv_layer.__call__,
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hidden_states,
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)
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else:
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hidden_states = conv_layer(hidden_states)
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return hidden_states
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class UniSpeechFeatureExtractor(UniSpeechFeatureEncoder):
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def __init__(self, config):
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super().__init__(config)
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warnings.warn(
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f"The class `{self.__class__.__name__}` has been depreciated "
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"and will be removed in Transformers v5. "
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f"Use `{self.__class__.__bases__[0].__name__}` instead.",
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FutureWarning,
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)
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# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2FeatureProjection with Wav2Vec2->UniSpeech
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class UniSpeechFeatureProjection(nn.Module):
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def __init__(self, config):
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super().__init__()
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self.layer_norm = nn.LayerNorm(config.conv_dim[-1], eps=config.layer_norm_eps)
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self.projection = nn.Linear(config.conv_dim[-1], config.hidden_size)
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self.dropout = nn.Dropout(config.feat_proj_dropout)
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def forward(self, hidden_states):
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# non-projected hidden states are needed for quantization
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norm_hidden_states = self.layer_norm(hidden_states)
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hidden_states = self.projection(norm_hidden_states)
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hidden_states = self.dropout(hidden_states)
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return hidden_states, norm_hidden_states
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# Copied from transformers.models.bart.modeling_bart.BartAttention with Bart->UniSpeech
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class UniSpeechAttention(nn.Module):
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"""Multi-headed attention from 'Attention Is All You Need' paper"""
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def __init__(
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self,
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embed_dim: int,
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num_heads: int,
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dropout: float = 0.0,
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is_decoder: bool = False,
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bias: bool = True,
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is_causal: bool = False,
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config: Optional[UniSpeechConfig] = None,
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):
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super().__init__()
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self.embed_dim = embed_dim
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self.num_heads = num_heads
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self.dropout = dropout
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self.head_dim = embed_dim // num_heads
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self.config = config
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if (self.head_dim * num_heads) != self.embed_dim:
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raise ValueError(
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f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim}"
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|
f" and `num_heads`: {num_heads})."
|
|
)
|
|
self.scaling = self.head_dim**-0.5
|
|
self.is_decoder = is_decoder
|
|
self.is_causal = is_causal
|
|
|
|
self.k_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
|
|
self.v_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
|
|
self.q_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
|
|
self.out_proj = nn.Linear(embed_dim, embed_dim, bias=bias)
|
|
|
|
def _shape(self, tensor: torch.Tensor, seq_len: int, bsz: int):
|
|
return tensor.view(bsz, seq_len, self.num_heads, self.head_dim).transpose(1, 2).contiguous()
|
|
|
|
def forward(
|
|
self,
|
|
hidden_states: torch.Tensor,
|
|
key_value_states: Optional[torch.Tensor] = None,
|
|
past_key_value: Optional[Tuple[torch.Tensor]] = None,
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
layer_head_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: bool = False,
|
|
) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
|
|
"""Input shape: Batch x Time x Channel"""
|
|
|
|
# if key_value_states are provided this layer is used as a cross-attention layer
|
|
# for the decoder
|
|
is_cross_attention = key_value_states is not None
|
|
|
|
bsz, tgt_len, _ = hidden_states.size()
|
|
|
|
# get query proj
|
|
query_states = self.q_proj(hidden_states) * self.scaling
|
|
# get key, value proj
|
|
# `past_key_value[0].shape[2] == key_value_states.shape[1]`
|
|
# is checking that the `sequence_length` of the `past_key_value` is the same as
|
|
# the provided `key_value_states` to support prefix tuning
|
|
if (
|
|
is_cross_attention
|
|
and past_key_value is not None
|
|
and past_key_value[0].shape[2] == key_value_states.shape[1]
|
|
):
|
|
# reuse k,v, cross_attentions
|
|
key_states = past_key_value[0]
|
|
value_states = past_key_value[1]
|
|
elif is_cross_attention:
|
|
# cross_attentions
|
|
key_states = self._shape(self.k_proj(key_value_states), -1, bsz)
|
|
value_states = self._shape(self.v_proj(key_value_states), -1, bsz)
|
|
elif past_key_value is not None:
|
|
# reuse k, v, self_attention
|
|
key_states = self._shape(self.k_proj(hidden_states), -1, bsz)
|
|
value_states = self._shape(self.v_proj(hidden_states), -1, bsz)
|
|
key_states = torch.cat([past_key_value[0], key_states], dim=2)
|
|
value_states = torch.cat([past_key_value[1], value_states], dim=2)
|
|
else:
|
|
# self_attention
|
|
key_states = self._shape(self.k_proj(hidden_states), -1, bsz)
|
|
value_states = self._shape(self.v_proj(hidden_states), -1, bsz)
|
|
|
|
if self.is_decoder:
|
|
# if cross_attention save Tuple(torch.Tensor, torch.Tensor) of all cross attention key/value_states.
|
|
# Further calls to cross_attention layer can then reuse all cross-attention
|
|
# key/value_states (first "if" case)
|
|
# if uni-directional self-attention (decoder) save Tuple(torch.Tensor, torch.Tensor) of
|
|
# all previous decoder key/value_states. Further calls to uni-directional self-attention
|
|
# can concat previous decoder key/value_states to current projected key/value_states (third "elif" case)
|
|
# if encoder bi-directional self-attention `past_key_value` is always `None`
|
|
past_key_value = (key_states, value_states)
|
|
|
|
proj_shape = (bsz * self.num_heads, -1, self.head_dim)
|
|
query_states = self._shape(query_states, tgt_len, bsz).view(*proj_shape)
|
|
key_states = key_states.reshape(*proj_shape)
|
|
value_states = value_states.reshape(*proj_shape)
|
|
|
|
src_len = key_states.size(1)
|
|
attn_weights = torch.bmm(query_states, key_states.transpose(1, 2))
|
|
|
|
if attn_weights.size() != (bsz * self.num_heads, tgt_len, src_len):
|
|
raise ValueError(
|
|
f"Attention weights should be of size {(bsz * self.num_heads, tgt_len, src_len)}, but is"
|
|
f" {attn_weights.size()}"
|
|
)
|
|
|
|
if attention_mask is not None:
|
|
if attention_mask.size() != (bsz, 1, tgt_len, src_len):
|
|
raise ValueError(
|
|
f"Attention mask should be of size {(bsz, 1, tgt_len, src_len)}, but is {attention_mask.size()}"
|
|
)
|
|
attn_weights = attn_weights.view(bsz, self.num_heads, tgt_len, src_len) + attention_mask
|
|
attn_weights = attn_weights.view(bsz * self.num_heads, tgt_len, src_len)
|
|
|
|
attn_weights = nn.functional.softmax(attn_weights, dim=-1)
|
|
|
|
if layer_head_mask is not None:
|
|
if layer_head_mask.size() != (self.num_heads,):
|
|
raise ValueError(
|
|
f"Head mask for a single layer should be of size {(self.num_heads,)}, but is"
|
|
f" {layer_head_mask.size()}"
|
|
)
|
|
attn_weights = layer_head_mask.view(1, -1, 1, 1) * attn_weights.view(bsz, self.num_heads, tgt_len, src_len)
|
|
attn_weights = attn_weights.view(bsz * self.num_heads, tgt_len, src_len)
|
|
|
|
if output_attentions:
|
|
# this operation is a bit awkward, but it's required to
|
|
# make sure that attn_weights keeps its gradient.
|
|
# In order to do so, attn_weights have to be reshaped
|
|
# twice and have to be reused in the following
|
|
attn_weights_reshaped = attn_weights.view(bsz, self.num_heads, tgt_len, src_len)
|
|
attn_weights = attn_weights_reshaped.view(bsz * self.num_heads, tgt_len, src_len)
|
|
else:
|
|
attn_weights_reshaped = None
|
|
|
|
attn_probs = nn.functional.dropout(attn_weights, p=self.dropout, training=self.training)
|
|
|
|
attn_output = torch.bmm(attn_probs, value_states)
|
|
|
|
if attn_output.size() != (bsz * self.num_heads, tgt_len, self.head_dim):
|
|
raise ValueError(
|
|
f"`attn_output` should be of size {(bsz * self.num_heads, tgt_len, self.head_dim)}, but is"
|
|
f" {attn_output.size()}"
|
|
)
|
|
|
|
attn_output = attn_output.view(bsz, self.num_heads, tgt_len, self.head_dim)
|
|
attn_output = attn_output.transpose(1, 2)
|
|
|
|
# Use the `embed_dim` from the config (stored in the class) rather than `hidden_state` because `attn_output` can be
|
|
# partitioned across GPUs when using tensor-parallelism.
|
|
attn_output = attn_output.reshape(bsz, tgt_len, self.embed_dim)
|
|
|
|
attn_output = self.out_proj(attn_output)
|
|
|
|
return attn_output, attn_weights_reshaped, past_key_value
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2FeedForward with Wav2Vec2->UniSpeech
|
|
class UniSpeechFeedForward(nn.Module):
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.intermediate_dropout = nn.Dropout(config.activation_dropout)
|
|
|
|
self.intermediate_dense = nn.Linear(config.hidden_size, config.intermediate_size)
|
|
if isinstance(config.hidden_act, str):
|
|
self.intermediate_act_fn = ACT2FN[config.hidden_act]
|
|
else:
|
|
self.intermediate_act_fn = config.hidden_act
|
|
|
|
self.output_dense = nn.Linear(config.intermediate_size, config.hidden_size)
|
|
self.output_dropout = nn.Dropout(config.hidden_dropout)
|
|
|
|
def forward(self, hidden_states):
|
|
hidden_states = self.intermediate_dense(hidden_states)
|
|
hidden_states = self.intermediate_act_fn(hidden_states)
|
|
hidden_states = self.intermediate_dropout(hidden_states)
|
|
|
|
hidden_states = self.output_dense(hidden_states)
|
|
hidden_states = self.output_dropout(hidden_states)
|
|
return hidden_states
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2EncoderLayer with Wav2Vec2->UniSpeech
|
|
class UniSpeechEncoderLayer(nn.Module):
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.attention = UniSpeechAttention(
|
|
embed_dim=config.hidden_size,
|
|
num_heads=config.num_attention_heads,
|
|
dropout=config.attention_dropout,
|
|
is_decoder=False,
|
|
)
|
|
self.dropout = nn.Dropout(config.hidden_dropout)
|
|
self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
self.feed_forward = UniSpeechFeedForward(config)
|
|
self.final_layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
|
|
def forward(self, hidden_states, attention_mask=None, output_attentions=False):
|
|
attn_residual = hidden_states
|
|
hidden_states, attn_weights, _ = self.attention(
|
|
hidden_states, attention_mask=attention_mask, output_attentions=output_attentions
|
|
)
|
|
hidden_states = self.dropout(hidden_states)
|
|
hidden_states = attn_residual + hidden_states
|
|
|
|
hidden_states = self.layer_norm(hidden_states)
|
|
hidden_states = hidden_states + self.feed_forward(hidden_states)
|
|
hidden_states = self.final_layer_norm(hidden_states)
|
|
|
|
outputs = (hidden_states,)
|
|
|
|
if output_attentions:
|
|
outputs += (attn_weights,)
|
|
|
|
return outputs
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2AttnAdapterLayer with Wav2Vec2->UniSpeech
|
|
class UniSpeechAttnAdapterLayer(nn.Module):
|
|
def __init__(self, config):
|
|
"""
|
|
Implements adapter modules directly with 3D tensor weight as parameters and without using ModuleList to speed
|
|
up training throughput.
|
|
"""
|
|
super().__init__()
|
|
self.input_dim = config.adapter_attn_dim
|
|
self.hidden_dim = config.hidden_size
|
|
|
|
self.norm = nn.LayerNorm(self.hidden_dim)
|
|
self.linear_1 = nn.Linear(self.hidden_dim, self.input_dim)
|
|
self.act_fn = nn.ReLU()
|
|
self.linear_2 = nn.Linear(self.input_dim, self.hidden_dim)
|
|
|
|
def forward(self, hidden_states: torch.FloatTensor):
|
|
hidden_states = self.norm(hidden_states)
|
|
|
|
hidden_states = self.linear_1(hidden_states)
|
|
hidden_states = self.act_fn(hidden_states)
|
|
hidden_states = self.linear_2(hidden_states)
|
|
|
|
return hidden_states
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2EncoderLayerStableLayerNorm with Wav2Vec2->UniSpeech
|
|
class UniSpeechEncoderLayerStableLayerNorm(nn.Module):
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.attention = UniSpeechAttention(
|
|
embed_dim=config.hidden_size,
|
|
num_heads=config.num_attention_heads,
|
|
dropout=config.attention_dropout,
|
|
is_decoder=False,
|
|
)
|
|
self.dropout = nn.Dropout(config.hidden_dropout)
|
|
self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
self.feed_forward = UniSpeechFeedForward(config)
|
|
self.final_layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
|
|
if getattr(config, "adapter_attn_dim", None) is not None:
|
|
self.adapter_layer = UniSpeechAttnAdapterLayer(config)
|
|
else:
|
|
self.adapter_layer = None
|
|
|
|
def forward(
|
|
self,
|
|
hidden_states: torch.Tensor,
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: bool = False,
|
|
):
|
|
attn_residual = hidden_states
|
|
hidden_states = self.layer_norm(hidden_states)
|
|
hidden_states, attn_weights, _ = self.attention(
|
|
hidden_states, attention_mask=attention_mask, output_attentions=output_attentions
|
|
)
|
|
hidden_states = self.dropout(hidden_states)
|
|
hidden_states = attn_residual + hidden_states
|
|
hidden_states = hidden_states + self.feed_forward(self.final_layer_norm(hidden_states))
|
|
|
|
if self.adapter_layer is not None:
|
|
hidden_states = hidden_states + self.adapter_layer(hidden_states)
|
|
|
|
outputs = (hidden_states,)
|
|
|
|
if output_attentions:
|
|
outputs += (attn_weights,)
|
|
|
|
return outputs
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2Encoder with Wav2Vec2->UniSpeech
|
|
class UniSpeechEncoder(nn.Module):
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.config = config
|
|
self.pos_conv_embed = UniSpeechPositionalConvEmbedding(config)
|
|
self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
self.dropout = nn.Dropout(config.hidden_dropout)
|
|
self.layers = nn.ModuleList([UniSpeechEncoderLayer(config) for _ in range(config.num_hidden_layers)])
|
|
self.gradient_checkpointing = False
|
|
|
|
def forward(
|
|
self,
|
|
hidden_states: torch.tensor,
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: bool = False,
|
|
output_hidden_states: bool = False,
|
|
return_dict: bool = True,
|
|
):
|
|
all_hidden_states = () if output_hidden_states else None
|
|
all_self_attentions = () if output_attentions else None
|
|
|
|
if attention_mask is not None:
|
|
# make sure padded tokens output 0
|
|
expand_attention_mask = attention_mask.unsqueeze(-1).repeat(1, 1, hidden_states.shape[2])
|
|
hidden_states[~expand_attention_mask] = 0
|
|
|
|
# extend attention_mask
|
|
attention_mask = 1.0 - attention_mask[:, None, None, :].to(dtype=hidden_states.dtype)
|
|
attention_mask = attention_mask * torch.finfo(hidden_states.dtype).min
|
|
attention_mask = attention_mask.expand(
|
|
attention_mask.shape[0], 1, attention_mask.shape[-1], attention_mask.shape[-1]
|
|
)
|
|
|
|
position_embeddings = self.pos_conv_embed(hidden_states)
|
|
hidden_states = hidden_states + position_embeddings
|
|
hidden_states = self.layer_norm(hidden_states)
|
|
hidden_states = self.dropout(hidden_states)
|
|
|
|
deepspeed_zero3_is_enabled = is_deepspeed_zero3_enabled()
|
|
|
|
for layer in self.layers:
|
|
if output_hidden_states:
|
|
all_hidden_states = all_hidden_states + (hidden_states,)
|
|
|
|
# add LayerDrop (see https://arxiv.org/abs/1909.11556 for description)
|
|
dropout_probability = torch.rand([])
|
|
|
|
skip_the_layer = True if self.training and (dropout_probability < self.config.layerdrop) else False
|
|
if not skip_the_layer or deepspeed_zero3_is_enabled:
|
|
# under deepspeed zero3 all gpus must run in sync
|
|
if self.gradient_checkpointing and self.training:
|
|
layer_outputs = self._gradient_checkpointing_func(
|
|
layer.__call__,
|
|
hidden_states,
|
|
attention_mask,
|
|
output_attentions,
|
|
)
|
|
else:
|
|
layer_outputs = layer(
|
|
hidden_states, attention_mask=attention_mask, output_attentions=output_attentions
|
|
)
|
|
hidden_states = layer_outputs[0]
|
|
|
|
if skip_the_layer:
|
|
layer_outputs = (None, None)
|
|
|
|
if output_attentions:
|
|
all_self_attentions = all_self_attentions + (layer_outputs[1],)
|
|
|
|
if output_hidden_states:
|
|
all_hidden_states = all_hidden_states + (hidden_states,)
|
|
|
|
if not return_dict:
|
|
return tuple(v for v in [hidden_states, all_hidden_states, all_self_attentions] if v is not None)
|
|
return BaseModelOutput(
|
|
last_hidden_state=hidden_states,
|
|
hidden_states=all_hidden_states,
|
|
attentions=all_self_attentions,
|
|
)
|
|
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2EncoderStableLayerNorm with Wav2Vec2->UniSpeech
|
|
class UniSpeechEncoderStableLayerNorm(nn.Module):
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.config = config
|
|
self.pos_conv_embed = UniSpeechPositionalConvEmbedding(config)
|
|
self.layer_norm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
|
|
self.dropout = nn.Dropout(config.hidden_dropout)
|
|
self.layers = nn.ModuleList(
|
|
[UniSpeechEncoderLayerStableLayerNorm(config) for _ in range(config.num_hidden_layers)]
|
|
)
|
|
self.gradient_checkpointing = False
|
|
|
|
def forward(
|
|
self,
|
|
hidden_states,
|
|
attention_mask=None,
|
|
output_attentions=False,
|
|
output_hidden_states=False,
|
|
return_dict=True,
|
|
):
|
|
all_hidden_states = () if output_hidden_states else None
|
|
all_self_attentions = () if output_attentions else None
|
|
|
|
if attention_mask is not None:
|
|
# make sure padded tokens are not attended to
|
|
expand_attention_mask = attention_mask.unsqueeze(-1).repeat(1, 1, hidden_states.shape[2])
|
|
hidden_states[~expand_attention_mask] = 0
|
|
|
|
# extend attention_mask
|
|
attention_mask = 1.0 - attention_mask[:, None, None, :].to(dtype=hidden_states.dtype)
|
|
attention_mask = attention_mask * torch.finfo(hidden_states.dtype).min
|
|
attention_mask = attention_mask.expand(
|
|
attention_mask.shape[0], 1, attention_mask.shape[-1], attention_mask.shape[-1]
|
|
)
|
|
|
|
position_embeddings = self.pos_conv_embed(hidden_states)
|
|
hidden_states = hidden_states + position_embeddings
|
|
hidden_states = self.dropout(hidden_states)
|
|
|
|
deepspeed_zero3_is_enabled = is_deepspeed_zero3_enabled()
|
|
|
|
for layer in self.layers:
|
|
if output_hidden_states:
|
|
all_hidden_states = all_hidden_states + (hidden_states,)
|
|
|
|
# add LayerDrop (see https://arxiv.org/abs/1909.11556 for description)
|
|
dropout_probability = torch.rand([])
|
|
|
|
skip_the_layer = True if self.training and (dropout_probability < self.config.layerdrop) else False
|
|
if not skip_the_layer or deepspeed_zero3_is_enabled:
|
|
# under deepspeed zero3 all gpus must run in sync
|
|
# XXX: could optimize this like synced_gpus in generate_utils but not sure if it's worth the code complication
|
|
if self.gradient_checkpointing and self.training:
|
|
layer_outputs = self._gradient_checkpointing_func(
|
|
layer.__call__,
|
|
hidden_states,
|
|
attention_mask,
|
|
output_attentions,
|
|
)
|
|
else:
|
|
layer_outputs = layer(
|
|
hidden_states, attention_mask=attention_mask, output_attentions=output_attentions
|
|
)
|
|
hidden_states = layer_outputs[0]
|
|
|
|
if skip_the_layer:
|
|
layer_outputs = (None, None)
|
|
|
|
if output_attentions:
|
|
all_self_attentions = all_self_attentions + (layer_outputs[1],)
|
|
|
|
hidden_states = self.layer_norm(hidden_states)
|
|
|
|
if output_hidden_states:
|
|
all_hidden_states = all_hidden_states + (hidden_states,)
|
|
|
|
if not return_dict:
|
|
return tuple(v for v in [hidden_states, all_hidden_states, all_self_attentions] if v is not None)
|
|
return BaseModelOutput(
|
|
last_hidden_state=hidden_states,
|
|
hidden_states=all_hidden_states,
|
|
attentions=all_self_attentions,
|
|
)
|
|
|
|
|
|
class UniSpeechGumbelVectorQuantizer(nn.Module):
|
|
"""
|
|
Vector quantization using gumbel softmax. See [CATEGORICAL REPARAMETERIZATION WITH
|
|
GUMBEL-SOFTMAX](https://arxiv.org/pdf/1611.01144.pdf) for more information.
|
|
"""
|
|
|
|
def __init__(self, config):
|
|
super().__init__()
|
|
self.num_groups = config.num_codevector_groups
|
|
self.num_vars = config.num_codevectors_per_group
|
|
|
|
if config.codevector_dim % self.num_groups != 0:
|
|
raise ValueError(
|
|
f"`config.codevector_dim {config.codevector_dim} must be divisible by `config.num_codevector_groups`"
|
|
f" {self.num_groups} for concatenation"
|
|
)
|
|
|
|
# storage for codebook variables (codewords)
|
|
self.codevectors = nn.Parameter(
|
|
torch.FloatTensor(1, self.num_groups * self.num_vars, config.codevector_dim // self.num_groups)
|
|
)
|
|
self.weight_proj = nn.Linear(config.conv_dim[-1], self.num_groups * self.num_vars)
|
|
|
|
# can be decayed for training
|
|
self.temperature = 2
|
|
|
|
@staticmethod
|
|
def _compute_perplexity(probs):
|
|
marginal_probs = probs.mean(dim=0)
|
|
perplexity = torch.exp(-torch.sum(marginal_probs * torch.log(marginal_probs + 1e-7), dim=-1)).sum()
|
|
return perplexity
|
|
|
|
def forward(self, hidden_states):
|
|
batch_size, sequence_length, hidden_size = hidden_states.shape
|
|
|
|
# project to codevector dim
|
|
hidden_states = self.weight_proj(hidden_states)
|
|
hidden_states = hidden_states.view(batch_size * sequence_length * self.num_groups, -1)
|
|
|
|
if self.training:
|
|
# sample code vector probs via gumbel in differentiateable way
|
|
codevector_probs = nn.functional.gumbel_softmax(
|
|
hidden_states.float(), tau=self.temperature, hard=True
|
|
).type_as(hidden_states)
|
|
|
|
# compute perplexity
|
|
codevector_soft_dist = torch.softmax(
|
|
hidden_states.view(batch_size * sequence_length, self.num_groups, -1).float(), dim=-1
|
|
)
|
|
perplexity = self._compute_perplexity(codevector_soft_dist)
|
|
else:
|
|
# take argmax in non-differentiable way
|
|
# comptute hard codevector distribution (one hot)
|
|
codevector_idx = hidden_states.argmax(dim=-1)
|
|
codevector_probs = hidden_states.new_zeros(*hidden_states.shape).scatter_(
|
|
-1, codevector_idx.view(-1, 1), 1.0
|
|
)
|
|
codevector_probs = codevector_probs.view(batch_size * sequence_length, self.num_groups, -1)
|
|
|
|
perplexity = self._compute_perplexity(codevector_probs)
|
|
|
|
codevector_probs = codevector_probs.view(batch_size * sequence_length, -1)
|
|
# use probs to retrieve codevectors
|
|
codevectors_per_group = codevector_probs.unsqueeze(-1) * self.codevectors
|
|
codevectors = codevectors_per_group.view(batch_size * sequence_length, self.num_groups, self.num_vars, -1)
|
|
codevectors = codevectors.sum(-2).view(batch_size, sequence_length, -1)
|
|
|
|
return codevectors, perplexity
|
|
|
|
|
|
class UniSpeechPreTrainedModel(PreTrainedModel):
|
|
"""
|
|
An abstract class to handle weights initialization and a simple interface for downloading and loading pretrained
|
|
models.
|
|
"""
|
|
|
|
config_class = UniSpeechConfig
|
|
base_model_prefix = "unispeech"
|
|
main_input_name = "input_values"
|
|
supports_gradient_checkpointing = True
|
|
|
|
def _init_weights(self, module):
|
|
"""Initialize the weights"""
|
|
# gumbel softmax requires special init
|
|
if isinstance(module, UniSpeechGumbelVectorQuantizer):
|
|
module.weight_proj.weight.data.normal_(mean=0.0, std=1)
|
|
module.weight_proj.bias.data.zero_()
|
|
nn.init.uniform_(module.codevectors)
|
|
elif isinstance(module, UniSpeechPositionalConvEmbedding):
|
|
nn.init.normal_(
|
|
module.conv.weight,
|
|
mean=0,
|
|
std=2 * math.sqrt(1 / (module.conv.kernel_size[0] * module.conv.in_channels)),
|
|
)
|
|
nn.init.constant_(module.conv.bias, 0)
|
|
elif isinstance(module, UniSpeechFeatureProjection):
|
|
k = math.sqrt(1 / module.projection.in_features)
|
|
nn.init.uniform_(module.projection.weight, a=-k, b=k)
|
|
nn.init.uniform_(module.projection.bias, a=-k, b=k)
|
|
elif isinstance(module, nn.Linear):
|
|
module.weight.data.normal_(mean=0.0, std=self.config.initializer_range)
|
|
|
|
if module.bias is not None:
|
|
module.bias.data.zero_()
|
|
elif isinstance(module, (nn.LayerNorm, nn.GroupNorm)):
|
|
module.bias.data.zero_()
|
|
module.weight.data.fill_(1.0)
|
|
elif isinstance(module, nn.Conv1d):
|
|
nn.init.kaiming_normal_(module.weight)
|
|
|
|
if module.bias is not None:
|
|
k = math.sqrt(module.groups / (module.in_channels * module.kernel_size[0]))
|
|
nn.init.uniform_(module.bias, a=-k, b=k)
|
|
|
|
def _get_feat_extract_output_lengths(self, input_lengths: Union[torch.LongTensor, int]):
|
|
"""
|
|
Computes the output length of the convolutional layers
|
|
"""
|
|
|
|
def _conv_out_length(input_length, kernel_size, stride):
|
|
# 1D convolutional layer output length formula taken
|
|
# from https://pytorch.org/docs/stable/generated/torch.nn.Conv1d.html
|
|
return torch.div(input_length - kernel_size, stride, rounding_mode="floor") + 1
|
|
|
|
for kernel_size, stride in zip(self.config.conv_kernel, self.config.conv_stride):
|
|
input_lengths = _conv_out_length(input_lengths, kernel_size, stride)
|
|
|
|
return input_lengths
|
|
|
|
def _get_feature_vector_attention_mask(self, feature_vector_length: int, attention_mask: torch.LongTensor):
|
|
# Effectively attention_mask.sum(-1), but not inplace to be able to run
|
|
# on inference mode.
|
|
non_padded_lengths = attention_mask.cumsum(dim=-1)[:, -1]
|
|
output_lengths = self._get_feat_extract_output_lengths(non_padded_lengths).to(torch.long)
|
|
batch_size = attention_mask.shape[0]
|
|
|
|
attention_mask = torch.zeros(
|
|
(batch_size, feature_vector_length), dtype=attention_mask.dtype, device=attention_mask.device
|
|
)
|
|
# these two operations makes sure that all values before the output lengths idxs are attended to
|
|
attention_mask[(torch.arange(attention_mask.shape[0], device=attention_mask.device), output_lengths - 1)] = 1
|
|
attention_mask = attention_mask.flip([-1]).cumsum(-1).flip([-1]).bool()
|
|
return attention_mask
|
|
|
|
|
|
UNISPEECH_START_DOCSTRING = r"""
|
|
UniSpeech was proposed in [UniSpeech: Unified Speech Representation Learning with Labeled and Unlabeled
|
|
Data](https://arxiv.org/abs/2101.07597) by Chengyi Wang, Yu Wu, Yao Qian, Kenichi Kumatani, Shujie Liu, Furu Wei,
|
|
Michael Zeng, Xuedong Huang.
|
|
|
|
This model inherits from [`PreTrainedModel`]. Check the superclass documentation for the generic methods the
|
|
library implements for all its model (such as downloading or saving etc.).
|
|
|
|
This model is a PyTorch [torch.nn.Module](https://pytorch.org/docs/stable/nn.html#torch.nn.Module) sub-class. Use
|
|
it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and
|
|
behavior.
|
|
|
|
Parameters:
|
|
config ([`UniSpeechConfig`]): Model configuration class with all the parameters of the model.
|
|
Initializing with a config file does not load the weights associated with the model, only the
|
|
configuration. Check out the [`~PreTrainedModel.from_pretrained`] method to load the model weights.
|
|
"""
|
|
|
|
|
|
UNISPEECH_INPUTS_DOCSTRING = r"""
|
|
Args:
|
|
input_values (`torch.FloatTensor` of shape `(batch_size, sequence_length)`):
|
|
Float values of input raw speech waveform. Values can be obtained by loading a `.flac` or `.wav` audio file
|
|
into an array of type `List[float]` or a `numpy.ndarray`, *e.g.* via the soundfile library (`pip install
|
|
soundfile`). To prepare the array into `input_values`, the [`AutoProcessor`] should be used for padding and
|
|
conversion into a tensor of type `torch.FloatTensor`. See [`Wav2Vec2Processor.__call__`] for details.
|
|
attention_mask (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
|
|
Mask to avoid performing convolution and attention on padding token indices. Mask values selected in `[0,
|
|
1]`:
|
|
|
|
- 1 for tokens that are **not masked**,
|
|
- 0 for tokens that are **masked**.
|
|
|
|
[What are attention masks?](../glossary#attention-mask)
|
|
|
|
<Tip warning={true}>
|
|
|
|
`attention_mask` should only be passed if the corresponding processor has `config.return_attention_mask ==
|
|
True`. For all models whose processor has `config.return_attention_mask == False`, `attention_mask` should
|
|
**not** be passed to avoid degraded performance when doing batched inference. For such models
|
|
`input_values` should simply be padded with 0 and passed without `attention_mask`. Be aware that these
|
|
models also yield slightly different results depending on whether `input_values` is padded or not.
|
|
|
|
</Tip>
|
|
|
|
output_attentions (`bool`, *optional*):
|
|
Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned
|
|
tensors for more detail.
|
|
output_hidden_states (`bool`, *optional*):
|
|
Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors for
|
|
more detail.
|
|
return_dict (`bool`, *optional*):
|
|
Whether or not to return a [`~utils.ModelOutput`] instead of a plain tuple.
|
|
"""
|
|
|
|
|
|
@add_start_docstrings(
|
|
"The bare UniSpeech Model transformer outputting raw hidden-states without any specific head on top.",
|
|
UNISPEECH_START_DOCSTRING,
|
|
)
|
|
class UniSpeechModel(UniSpeechPreTrainedModel):
|
|
def __init__(self, config: UniSpeechConfig):
|
|
super().__init__(config)
|
|
self.config = config
|
|
self.feature_extractor = UniSpeechFeatureEncoder(config)
|
|
self.feature_projection = UniSpeechFeatureProjection(config)
|
|
|
|
if config.mask_time_prob > 0.0 or config.mask_feature_prob > 0.0:
|
|
self.masked_spec_embed = nn.Parameter(torch.FloatTensor(config.hidden_size).uniform_())
|
|
|
|
if config.do_stable_layer_norm:
|
|
self.encoder = UniSpeechEncoderStableLayerNorm(config)
|
|
else:
|
|
self.encoder = UniSpeechEncoder(config)
|
|
|
|
# Initialize weights and apply final processing
|
|
self.post_init()
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2Model._mask_hidden_states
|
|
def _mask_hidden_states(
|
|
self,
|
|
hidden_states: torch.FloatTensor,
|
|
mask_time_indices: Optional[torch.FloatTensor] = None,
|
|
attention_mask: Optional[torch.LongTensor] = None,
|
|
):
|
|
"""
|
|
Masks extracted features along time axis and/or along feature axis according to
|
|
[SpecAugment](https://arxiv.org/abs/1904.08779).
|
|
"""
|
|
|
|
# `config.apply_spec_augment` can set masking to False
|
|
if not getattr(self.config, "apply_spec_augment", True):
|
|
return hidden_states
|
|
|
|
# generate indices & apply SpecAugment along time axis
|
|
batch_size, sequence_length, hidden_size = hidden_states.size()
|
|
|
|
if mask_time_indices is not None:
|
|
# apply SpecAugment along time axis with given mask_time_indices
|
|
hidden_states[mask_time_indices] = self.masked_spec_embed.to(hidden_states.dtype)
|
|
elif self.config.mask_time_prob > 0 and self.training:
|
|
mask_time_indices = _compute_mask_indices(
|
|
(batch_size, sequence_length),
|
|
mask_prob=self.config.mask_time_prob,
|
|
mask_length=self.config.mask_time_length,
|
|
attention_mask=attention_mask,
|
|
min_masks=self.config.mask_time_min_masks,
|
|
)
|
|
mask_time_indices = torch.tensor(mask_time_indices, device=hidden_states.device, dtype=torch.bool)
|
|
hidden_states[mask_time_indices] = self.masked_spec_embed.to(hidden_states.dtype)
|
|
|
|
if self.config.mask_feature_prob > 0 and self.training:
|
|
# generate indices & apply SpecAugment along feature axis
|
|
mask_feature_indices = _compute_mask_indices(
|
|
(batch_size, hidden_size),
|
|
mask_prob=self.config.mask_feature_prob,
|
|
mask_length=self.config.mask_feature_length,
|
|
min_masks=self.config.mask_feature_min_masks,
|
|
)
|
|
mask_feature_indices = torch.tensor(mask_feature_indices, device=hidden_states.device, dtype=torch.bool)
|
|
mask_feature_indices = mask_feature_indices[:, None].expand(-1, sequence_length, -1)
|
|
hidden_states[mask_feature_indices] = 0
|
|
|
|
return hidden_states
|
|
|
|
@add_start_docstrings_to_model_forward(UNISPEECH_INPUTS_DOCSTRING)
|
|
@add_code_sample_docstrings(
|
|
checkpoint=_CHECKPOINT_FOR_DOC,
|
|
output_type=Wav2Vec2BaseModelOutput,
|
|
config_class=_CONFIG_FOR_DOC,
|
|
modality="audio",
|
|
expected_output=_EXPECTED_OUTPUT_SHAPE,
|
|
)
|
|
def forward(
|
|
self,
|
|
input_values: Optional[torch.Tensor],
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
mask_time_indices: Optional[torch.FloatTensor] = None,
|
|
output_attentions: Optional[bool] = None,
|
|
output_hidden_states: Optional[bool] = None,
|
|
return_dict: Optional[bool] = None,
|
|
) -> Union[Tuple, Wav2Vec2BaseModelOutput]:
|
|
output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
|
|
output_hidden_states = (
|
|
output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
|
|
)
|
|
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
|
|
|
|
extract_features = self.feature_extractor(input_values)
|
|
extract_features = extract_features.transpose(1, 2)
|
|
|
|
if attention_mask is not None:
|
|
# compute reduced attention_mask corresponding to feature vectors
|
|
attention_mask = self._get_feature_vector_attention_mask(extract_features.shape[1], attention_mask)
|
|
|
|
hidden_states, extract_features = self.feature_projection(extract_features)
|
|
hidden_states = self._mask_hidden_states(
|
|
hidden_states, mask_time_indices=mask_time_indices, attention_mask=attention_mask
|
|
)
|
|
|
|
encoder_outputs = self.encoder(
|
|
hidden_states,
|
|
attention_mask=attention_mask,
|
|
output_attentions=output_attentions,
|
|
output_hidden_states=output_hidden_states,
|
|
return_dict=return_dict,
|
|
)
|
|
|
|
hidden_states = encoder_outputs[0]
|
|
|
|
if not return_dict:
|
|
return (hidden_states, extract_features) + encoder_outputs[1:]
|
|
|
|
return Wav2Vec2BaseModelOutput(
|
|
last_hidden_state=hidden_states,
|
|
extract_features=extract_features,
|
|
hidden_states=encoder_outputs.hidden_states,
|
|
attentions=encoder_outputs.attentions,
|
|
)
|
|
|
|
|
|
@add_start_docstrings(
|
|
"""UniSpeech Model with a vector-quantization module and ctc loss for pre-training.""", UNISPEECH_START_DOCSTRING
|
|
)
|
|
class UniSpeechForPreTraining(UniSpeechPreTrainedModel):
|
|
def __init__(self, config: UniSpeechConfig):
|
|
super().__init__(config)
|
|
self.unispeech = UniSpeechModel(config)
|
|
self.dropout_features = nn.Dropout(config.feat_quantizer_dropout)
|
|
|
|
self.quantizer = UniSpeechGumbelVectorQuantizer(config)
|
|
self.project_q = nn.Linear(config.codevector_dim, config.proj_codevector_dim)
|
|
self.project_hid = nn.Linear(config.proj_codevector_dim, config.hidden_size)
|
|
|
|
self.ctc_proj = nn.Linear(config.hidden_size, config.num_ctc_classes)
|
|
self.dropout = nn.Dropout(config.final_dropout)
|
|
|
|
# Initialize weights and apply final processing
|
|
self.post_init()
|
|
|
|
def set_gumbel_temperature(self, temperature: int):
|
|
"""
|
|
Set the Gumbel softmax temperature to a given value. Only necessary for training
|
|
"""
|
|
self.quantizer.temperature = temperature
|
|
|
|
def freeze_feature_extractor(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameters will
|
|
not be updated during training.
|
|
"""
|
|
warnings.warn(
|
|
"The method `freeze_feature_extractor` is deprecated and will be removed in Transformers v5. "
|
|
"Please use the equivalent `freeze_feature_encoder` method instead.",
|
|
FutureWarning,
|
|
)
|
|
self.freeze_feature_encoder()
|
|
|
|
def freeze_feature_encoder(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameter will
|
|
not be updated during training.
|
|
"""
|
|
self.unispeech.feature_extractor._freeze_parameters()
|
|
|
|
@staticmethod
|
|
def compute_contrastive_logits(
|
|
target_features: torch.FloatTensor,
|
|
negative_features: torch.FloatTensor,
|
|
predicted_features: torch.FloatTensor,
|
|
temperature: int = 1,
|
|
):
|
|
"""
|
|
Compute logits for contrastive loss based using cosine similarity as the distance measure between
|
|
`[positive_feature, negative_features]` and `[predicted_features]`. Additionally, temperature can be applied.
|
|
"""
|
|
target_features = torch.cat([target_features, negative_features], dim=0)
|
|
|
|
logits = torch.cosine_similarity(predicted_features.float(), target_features.float(), dim=-1)
|
|
logits = logits.type_as(target_features)
|
|
|
|
# apply temperature
|
|
logits = logits / temperature
|
|
return logits
|
|
|
|
@add_start_docstrings_to_model_forward(UNISPEECH_INPUTS_DOCSTRING)
|
|
@replace_return_docstrings(output_type=UniSpeechForPreTrainingOutput, config_class=_CONFIG_FOR_DOC)
|
|
def forward(
|
|
self,
|
|
input_values: Optional[torch.Tensor],
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: Optional[bool] = None,
|
|
output_hidden_states: Optional[bool] = None,
|
|
return_dict: Optional[bool] = None,
|
|
) -> Union[Tuple, UniSpeechForPreTrainingOutput]:
|
|
r"""
|
|
mask_time_indices (`torch.BoolTensor` of shape `(batch_size, sequence_length)`, *optional*):
|
|
Indices to mask extracted features for contrastive loss. When in training mode, model learns to predict
|
|
masked extracted features in *config.proj_codevector_dim* space.
|
|
sampled_negative_indices (`torch.BoolTensor` of shape `(batch_size, sequence_length, num_negatives)`, *optional*):
|
|
Indices indicating which quantized target vectors are used as negative sampled vectors in contrastive loss.
|
|
Required input for pre-training.
|
|
|
|
Returns:
|
|
|
|
Example:
|
|
|
|
```python
|
|
>>> import torch
|
|
>>> from transformers import AutoFeatureExtractor, UniSpeechForPreTraining
|
|
|
|
>>> feature_extractor = AutoFeatureExtractor.from_pretrained("microsoft/unispeech-large-1500h-cv")
|
|
>>> model = UniSpeechForPreTraining.from_pretrained("microsoft/unispeech-large-1500h-cv")
|
|
>>> # TODO: Add full pretraining example
|
|
```"""
|
|
|
|
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
|
|
|
|
outputs = self.unispeech(
|
|
input_values,
|
|
attention_mask=attention_mask,
|
|
output_attentions=output_attentions,
|
|
output_hidden_states=output_hidden_states,
|
|
return_dict=return_dict,
|
|
)
|
|
transformer_features = outputs[0]
|
|
|
|
# quantize all (unmasked) extracted features and project to final vq dim
|
|
extract_features = self.dropout_features(outputs[1])
|
|
quantized_features, codevector_perplexity = self.quantizer(extract_features)
|
|
|
|
# project quantized features twice
|
|
quantized_features = self.project_q(quantized_features)
|
|
quantized_features = self.project_hid(quantized_features)
|
|
|
|
prob_replace_matrix = torch.empty(transformer_features.size(0), transformer_features.size(1)).fill_(
|
|
self.config.replace_prob
|
|
)
|
|
prob_replace_matrix = prob_replace_matrix.transpose(0, 1)
|
|
sampled_replace_matrix = torch.bernoulli(prob_replace_matrix).bool().to(transformer_features.device)
|
|
sampled_replace_matrix = sampled_replace_matrix.transpose(0, 1)
|
|
sampled_replace_matrix = sampled_replace_matrix.unsqueeze(-1)
|
|
logits = transformer_features.masked_fill(sampled_replace_matrix, 0.0) + (
|
|
quantized_features.masked_fill(~sampled_replace_matrix, 0.0)
|
|
)
|
|
|
|
# project to ctc units
|
|
logits = self.dropout(logits)
|
|
logits = self.ctc_proj(logits)
|
|
|
|
# TODO(PVP) - add negative sampling & loss computation
|
|
loss = None
|
|
if not return_dict:
|
|
if loss is not None:
|
|
return (loss, transformer_features, quantized_features, codevector_perplexity) + outputs[2:]
|
|
return (transformer_features, quantized_features, codevector_perplexity) + outputs[2:]
|
|
|
|
return UniSpeechForPreTrainingOutput(
|
|
loss=loss,
|
|
projected_states=transformer_features,
|
|
projected_quantized_states=quantized_features,
|
|
codevector_perplexity=codevector_perplexity,
|
|
hidden_states=outputs.hidden_states,
|
|
attentions=outputs.attentions,
|
|
)
|
|
|
|
|
|
@add_start_docstrings(
|
|
"""UniSpeech Model with a `language modeling` head on top for Connectionist Temporal Classification (CTC).""",
|
|
UNISPEECH_START_DOCSTRING,
|
|
"""
|
|
target_lang (`str`, *optional*):
|
|
Language id of adapter weights. Adapter weights are stored in the format adapter.<lang>.safetensors or
|
|
adapter.<lang>.bin. Only relevant when using an instance of [`UniSpeechForCTC`] with adapters. Uses 'eng'
|
|
by default.
|
|
""",
|
|
)
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2ForCTC with Wav2Vec2->UniSpeech, wav2vec2->unispeech, WAV_2_VEC_2->UNISPEECH
|
|
class UniSpeechForCTC(UniSpeechPreTrainedModel):
|
|
def __init__(self, config, target_lang: Optional[str] = None):
|
|
super().__init__(config)
|
|
|
|
self.unispeech = UniSpeechModel(config)
|
|
self.dropout = nn.Dropout(config.final_dropout)
|
|
|
|
self.target_lang = target_lang
|
|
|
|
if config.vocab_size is None:
|
|
raise ValueError(
|
|
f"You are trying to instantiate {self.__class__} with a configuration that "
|
|
"does not define the vocabulary size of the language model head. Please "
|
|
"instantiate the model as follows: `UniSpeechForCTC.from_pretrained(..., vocab_size=vocab_size)`. "
|
|
"or define `vocab_size` of your model's configuration."
|
|
)
|
|
output_hidden_size = (
|
|
config.output_hidden_size if hasattr(config, "add_adapter") and config.add_adapter else config.hidden_size
|
|
)
|
|
self.lm_head = nn.Linear(output_hidden_size, config.vocab_size)
|
|
|
|
# Initialize weights and apply final processing
|
|
self.post_init()
|
|
|
|
def tie_weights(self):
|
|
"""
|
|
This method overwrites [`~PreTrainedModel.tie_weights`] so that adapter weights can be correctly loaded when
|
|
passing `target_lang=...` to `from_pretrained(...)`.
|
|
|
|
This method is **not** supposed to be called by the user and is prone to be changed in the future.
|
|
"""
|
|
|
|
# Note that `tie_weights` is usually used to tie input and output embedding weights. The method is re-purposed to
|
|
# correctly load adapter layers for UniSpeech so that we do not have to introduce a new API to
|
|
# [`PreTrainedModel`]. While slightly hacky, UniSpeech never has to tie input and output embeddings, so that it is
|
|
# ok to repurpose this function here.
|
|
target_lang = self.target_lang
|
|
|
|
if target_lang is not None and getattr(self.config, "adapter_attn_dim", None) is None:
|
|
raise ValueError(f"Cannot pass `target_lang`: {target_lang} if `config.adapter_attn_dim` is not defined.")
|
|
elif target_lang is None and getattr(self.config, "adapter_attn_dim", None) is not None:
|
|
logger.info("By default `target_lang` is set to 'eng'.")
|
|
elif target_lang is not None:
|
|
self.load_adapter(target_lang, force_load=True)
|
|
|
|
def freeze_feature_extractor(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameter will
|
|
not be updated during training.
|
|
"""
|
|
warnings.warn(
|
|
"The method `freeze_feature_extractor` is deprecated and will be removed in Transformers v5. "
|
|
"Please use the equivalent `freeze_feature_encoder` method instead.",
|
|
FutureWarning,
|
|
)
|
|
self.freeze_feature_encoder()
|
|
|
|
def freeze_feature_encoder(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameter will
|
|
not be updated during training.
|
|
"""
|
|
self.unispeech.feature_extractor._freeze_parameters()
|
|
|
|
def freeze_base_model(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the base model so that its parameters will not
|
|
be updated during training. Only the classification head will be updated.
|
|
"""
|
|
for param in self.unispeech.parameters():
|
|
param.requires_grad = False
|
|
|
|
@add_start_docstrings_to_model_forward(UNISPEECH_INPUTS_DOCSTRING)
|
|
@add_code_sample_docstrings(
|
|
checkpoint=_CHECKPOINT_FOR_DOC,
|
|
output_type=CausalLMOutput,
|
|
config_class=_CONFIG_FOR_DOC,
|
|
expected_output=_CTC_EXPECTED_OUTPUT,
|
|
expected_loss=_CTC_EXPECTED_LOSS,
|
|
)
|
|
def forward(
|
|
self,
|
|
input_values: Optional[torch.Tensor],
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: Optional[bool] = None,
|
|
output_hidden_states: Optional[bool] = None,
|
|
return_dict: Optional[bool] = None,
|
|
labels: Optional[torch.Tensor] = None,
|
|
) -> Union[Tuple, CausalLMOutput]:
|
|
r"""
|
|
labels (`torch.LongTensor` of shape `(batch_size, target_length)`, *optional*):
|
|
Labels for connectionist temporal classification. Note that `target_length` has to be smaller or equal to
|
|
the sequence length of the output logits. Indices are selected in `[-100, 0, ..., config.vocab_size - 1]`.
|
|
All labels set to `-100` are ignored (masked), the loss is only computed for labels in `[0, ...,
|
|
config.vocab_size - 1]`.
|
|
"""
|
|
|
|
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
|
|
|
|
outputs = self.unispeech(
|
|
input_values,
|
|
attention_mask=attention_mask,
|
|
output_attentions=output_attentions,
|
|
output_hidden_states=output_hidden_states,
|
|
return_dict=return_dict,
|
|
)
|
|
|
|
hidden_states = outputs[0]
|
|
hidden_states = self.dropout(hidden_states)
|
|
|
|
logits = self.lm_head(hidden_states)
|
|
|
|
loss = None
|
|
if labels is not None:
|
|
if labels.max() >= self.config.vocab_size:
|
|
raise ValueError(f"Label values must be <= vocab_size: {self.config.vocab_size}")
|
|
|
|
# retrieve loss input_lengths from attention_mask
|
|
attention_mask = (
|
|
attention_mask if attention_mask is not None else torch.ones_like(input_values, dtype=torch.long)
|
|
)
|
|
input_lengths = self._get_feat_extract_output_lengths(attention_mask.sum(-1)).to(torch.long)
|
|
|
|
# assuming that padded tokens are filled with -100
|
|
# when not being attended to
|
|
labels_mask = labels >= 0
|
|
target_lengths = labels_mask.sum(-1)
|
|
flattened_targets = labels.masked_select(labels_mask)
|
|
|
|
# ctc_loss doesn't support fp16
|
|
log_probs = nn.functional.log_softmax(logits, dim=-1, dtype=torch.float32).transpose(0, 1)
|
|
|
|
with torch.backends.cudnn.flags(enabled=False):
|
|
loss = nn.functional.ctc_loss(
|
|
log_probs,
|
|
flattened_targets,
|
|
input_lengths,
|
|
target_lengths,
|
|
blank=self.config.pad_token_id,
|
|
reduction=self.config.ctc_loss_reduction,
|
|
zero_infinity=self.config.ctc_zero_infinity,
|
|
)
|
|
|
|
if not return_dict:
|
|
output = (logits,) + outputs[_HIDDEN_STATES_START_POSITION:]
|
|
return ((loss,) + output) if loss is not None else output
|
|
|
|
return CausalLMOutput(
|
|
loss=loss, logits=logits, hidden_states=outputs.hidden_states, attentions=outputs.attentions
|
|
)
|
|
|
|
|
|
@add_start_docstrings(
|
|
"""
|
|
UniSpeech Model with a sequence classification head on top (a linear layer over the pooled output) for tasks like
|
|
SUPERB Keyword Spotting.
|
|
""",
|
|
UNISPEECH_START_DOCSTRING,
|
|
)
|
|
class UniSpeechForSequenceClassification(UniSpeechPreTrainedModel):
|
|
def __init__(self, config):
|
|
super().__init__(config)
|
|
|
|
if hasattr(config, "add_adapter") and config.add_adapter:
|
|
raise ValueError(
|
|
"Sequence classification does not support the use of UniSpeech adapters (config.add_adapter=True)"
|
|
)
|
|
self.unispeech = UniSpeechModel(config)
|
|
num_layers = config.num_hidden_layers + 1 # transformer layers + input embeddings
|
|
if config.use_weighted_layer_sum:
|
|
self.layer_weights = nn.Parameter(torch.ones(num_layers) / num_layers)
|
|
self.projector = nn.Linear(config.hidden_size, config.classifier_proj_size)
|
|
self.classifier = nn.Linear(config.classifier_proj_size, config.num_labels)
|
|
|
|
# Initialize weights and apply final processing
|
|
self.post_init()
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2ForSequenceClassification.freeze_feature_extractor
|
|
def freeze_feature_extractor(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameters will
|
|
not be updated during training.
|
|
"""
|
|
warnings.warn(
|
|
"The method `freeze_feature_extractor` is deprecated and will be removed in Transformers v5. "
|
|
"Please use the equivalent `freeze_feature_encoder` method instead.",
|
|
FutureWarning,
|
|
)
|
|
self.freeze_feature_encoder()
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2ForSequenceClassification.freeze_feature_encoder with wav2vec2->unispeech
|
|
def freeze_feature_encoder(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the feature encoder so that its parameter will
|
|
not be updated during training.
|
|
"""
|
|
self.unispeech.feature_extractor._freeze_parameters()
|
|
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2ForSequenceClassification.freeze_base_model with wav2vec2->unispeech
|
|
def freeze_base_model(self):
|
|
"""
|
|
Calling this function will disable the gradient computation for the base model so that its parameters will not
|
|
be updated during training. Only the classification head will be updated.
|
|
"""
|
|
for param in self.unispeech.parameters():
|
|
param.requires_grad = False
|
|
|
|
@add_start_docstrings_to_model_forward(UNISPEECH_INPUTS_DOCSTRING)
|
|
@add_code_sample_docstrings(
|
|
checkpoint=_CHECKPOINT_FOR_DOC,
|
|
output_type=SequenceClassifierOutput,
|
|
config_class=_CONFIG_FOR_DOC,
|
|
modality="audio",
|
|
)
|
|
# Copied from transformers.models.wav2vec2.modeling_wav2vec2.Wav2Vec2ForSequenceClassification.forward with Wav2Vec2->UniSpeech, wav2vec2->unispeech
|
|
def forward(
|
|
self,
|
|
input_values: Optional[torch.Tensor],
|
|
attention_mask: Optional[torch.Tensor] = None,
|
|
output_attentions: Optional[bool] = None,
|
|
output_hidden_states: Optional[bool] = None,
|
|
return_dict: Optional[bool] = None,
|
|
labels: Optional[torch.Tensor] = None,
|
|
) -> Union[Tuple, SequenceClassifierOutput]:
|
|
r"""
|
|
labels (`torch.LongTensor` of shape `(batch_size,)`, *optional*):
|
|
Labels for computing the sequence classification/regression loss. Indices should be in `[0, ...,
|
|
config.num_labels - 1]`. If `config.num_labels == 1` a regression loss is computed (Mean-Square loss), If
|
|
`config.num_labels > 1` a classification loss is computed (Cross-Entropy).
|
|
"""
|
|
|
|
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
|
|
output_hidden_states = True if self.config.use_weighted_layer_sum else output_hidden_states
|
|
|
|
outputs = self.unispeech(
|
|
input_values,
|
|
attention_mask=attention_mask,
|
|
output_attentions=output_attentions,
|
|
output_hidden_states=output_hidden_states,
|
|
return_dict=return_dict,
|
|
)
|
|
|
|
if self.config.use_weighted_layer_sum:
|
|
hidden_states = outputs[_HIDDEN_STATES_START_POSITION]
|
|
hidden_states = torch.stack(hidden_states, dim=1)
|
|
norm_weights = nn.functional.softmax(self.layer_weights, dim=-1)
|
|
hidden_states = (hidden_states * norm_weights.view(-1, 1, 1)).sum(dim=1)
|
|
else:
|
|
hidden_states = outputs[0]
|
|
|
|
hidden_states = self.projector(hidden_states)
|
|
if attention_mask is None:
|
|
pooled_output = hidden_states.mean(dim=1)
|
|
else:
|
|
padding_mask = self._get_feature_vector_attention_mask(hidden_states.shape[1], attention_mask)
|
|
hidden_states[~padding_mask] = 0.0
|
|
pooled_output = hidden_states.sum(dim=1) / padding_mask.sum(dim=1).view(-1, 1)
|
|
|
|
logits = self.classifier(pooled_output)
|
|
|
|
loss = None
|
|
if labels is not None:
|
|
loss_fct = CrossEntropyLoss()
|
|
loss = loss_fct(logits.view(-1, self.config.num_labels), labels.view(-1))
|
|
|
|
if not return_dict:
|
|
output = (logits,) + outputs[_HIDDEN_STATES_START_POSITION:]
|
|
return ((loss,) + output) if loss is not None else output
|
|
|
|
return SequenceClassifierOutput(
|
|
loss=loss,
|
|
logits=logits,
|
|
hidden_states=outputs.hidden_states,
|
|
attentions=outputs.attentions,
|
|
)
|