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| from packaging import version | |
| from typing import Optional, Tuple | |
| import numpy as np | |
| import torch | |
| import torch.nn.functional as F | |
| import transformers | |
| from transformers import Wav2Vec2Model | |
| from transformers.modeling_outputs import BaseModelOutput | |
| _CONFIG_FOR_DOC = 'Wav2Vec2Config' | |
| # the implementation of Wav2Vec2Model is borrowed from | |
| # https://huggingface.co/transformers/_modules/transformers/models/wav2vec2/modeling_wav2vec2.html#Wav2Vec2Model | |
| # initialize our encoder with the pre-trained wav2vec 2.0 weights. | |
| def _compute_mask_indices(shape: Tuple[int, int], mask_prob: float, mask_length: int, | |
| attention_mask: Optional[torch.Tensor] = None, min_masks: int = 0, ) -> np.ndarray: | |
| bsz, all_sz = shape | |
| mask = np.full((bsz, all_sz), False) | |
| all_num_mask = int(mask_prob * all_sz / float(mask_length) + np.random.rand()) | |
| all_num_mask = max(min_masks, all_num_mask) | |
| mask_idcs = [] | |
| padding_mask = attention_mask.ne(1) if attention_mask is not None else None | |
| for i in range(bsz): | |
| if padding_mask is not None: | |
| sz = all_sz - padding_mask[i].long().sum().item() | |
| num_mask = int(mask_prob * sz / float(mask_length) + np.random.rand()) | |
| num_mask = max(min_masks, num_mask) | |
| else: | |
| sz = all_sz | |
| num_mask = all_num_mask | |
| lengths = np.full(num_mask, mask_length) | |
| if sum(lengths) == 0: | |
| lengths[0] = min(mask_length, sz - 1) | |
| min_len = min(lengths) | |
| if sz - min_len <= num_mask: | |
| min_len = sz - num_mask - 1 | |
| mask_idc = np.random.choice(sz - min_len, num_mask, replace=False) | |
| mask_idc = np.asarray([mask_idc[j] + offset for j in range(len(mask_idc)) for offset in range(lengths[j])]) | |
| mask_idcs.append(np.unique(mask_idc[mask_idc < sz])) | |
| min_len = min([len(m) for m in mask_idcs]) | |
| for i, mask_idc in enumerate(mask_idcs): | |
| if len(mask_idc) > min_len: | |
| mask_idc = np.random.choice(mask_idc, min_len, replace=False) | |
| mask[i, mask_idc] = True | |
| return mask | |
| # linear interpolation layer | |
| def linear_interpolation(features, input_fps, output_fps, output_len=None): | |
| # features: (N, C, L) | |
| seq_len = features.shape[2] / float(input_fps) | |
| if output_len is None: | |
| output_len = int(seq_len * output_fps) | |
| output_features = F.interpolate(features, size=output_len, align_corners=False, mode='linear') | |
| return output_features | |
| class Wav2Vec2Model(Wav2Vec2Model): | |
| def __init__(self, config): | |
| super().__init__(config) | |
| self.is_old_version = version.parse(transformers.__version__) < version.parse('4.7.0') | |
| def forward(self, input_values, output_fps=25, attention_mask=None, output_attentions=None, | |
| output_hidden_states=None, return_dict=None, frame_num=None): | |
| self.config.output_attentions = True | |
| 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 | |
| hidden_states = self.feature_extractor(input_values) # (N, C, L) | |
| # Resample the audio feature @ 50 fps to `output_fps`. | |
| if frame_num is not None: | |
| hidden_states_len = round(frame_num * 50 / output_fps) | |
| hidden_states = hidden_states[:, :, :hidden_states_len] | |
| hidden_states = linear_interpolation(hidden_states, 50, output_fps, output_len=frame_num) | |
| hidden_states = hidden_states.transpose(1, 2) # (N, L, C) | |
| if attention_mask is not None: | |
| output_lengths = self._get_feat_extract_output_lengths(attention_mask.sum(-1)) | |
| attention_mask = torch.zeros(hidden_states.shape[:2], dtype=hidden_states.dtype, | |
| device=hidden_states.device) | |
| attention_mask[(torch.arange(attention_mask.shape[0], device=hidden_states.device), output_lengths - 1)] = 1 | |
| attention_mask = attention_mask.flip([-1]).cumsum(-1).flip([-1]).bool() | |
| if self.is_old_version: | |
| hidden_states = self.feature_projection(hidden_states) | |
| else: | |
| hidden_states = self.feature_projection(hidden_states)[0] | |
| if self.config.apply_spec_augment and self.training: | |
| batch_size, sequence_length, hidden_size = hidden_states.size() | |
| if self.config.mask_time_prob > 0: | |
| mask_time_indices = _compute_mask_indices((batch_size, sequence_length), self.config.mask_time_prob, | |
| self.config.mask_time_length, attention_mask=attention_mask, | |
| min_masks=2, ) | |
| hidden_states[torch.from_numpy(mask_time_indices)] = self.masked_spec_embed.to(hidden_states.dtype) | |
| if self.config.mask_feature_prob > 0: | |
| mask_feature_indices = _compute_mask_indices((batch_size, hidden_size), self.config.mask_feature_prob, | |
| self.config.mask_feature_length, ) | |
| mask_feature_indices = torch.from_numpy(mask_feature_indices).to(hidden_states.device) | |
| hidden_states[mask_feature_indices[:, None].expand(-1, sequence_length, -1)] = 0 | |
| 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,) + encoder_outputs[1:] | |
| return BaseModelOutput(last_hidden_state=hidden_states, hidden_states=encoder_outputs.hidden_states, | |
| attentions=encoder_outputs.attentions, ) | |