"""This lobe enables the integration of huggingface pretrained wav2vec2 models.
Reference: https://arxiv.org/abs/2006.11477
Reference: https://arxiv.org/abs/1904.05862
Reference: https://arxiv.org/abs/2110.13900
Transformer from HuggingFace needs to be installed:
https://huggingface.co/transformers/installation.html
Authors
* Titouan Parcollet 2021
* Boumadane Abdelmoumene 2021
* Ha Nguyen 2023
"""
import torch
import logging
import numpy as np
import torch.nn.functional as F
from speechbrain.lobes.models.huggingface_transformers.huggingface import (
HFTransformersInterface,
)
from speechbrain.lobes.models.huggingface_transformers.huggingface import (
make_padding_masks,
)
import transformers
from transformers.models.wav2vec2.modeling_wav2vec2 import _compute_mask_indices
logger = logging.getLogger(__name__)
[docs]
class Wav2Vec2(HFTransformersInterface):
"""This lobe enables the integration of HuggingFace and SpeechBrain
pretrained wav2vec2.0/Hubert models.
Source paper wav2vec2.0: https://arxiv.org/abs/2006.11477
Source paper Hubert: https://arxiv.org/abs/2106.07447
Transformer from HuggingFace needs to be installed:
https://huggingface.co/transformers/installation.html
The model can be used as a fixed feature extractor or can be finetuned. It
will download automatically the model from HuggingFace or use a local path.
Arguments
---------
source : str
HuggingFace hub name: e.g "facebook/wav2vec2-large-lv60"
save_path : str
Path (dir) of the downloaded model.
output_norm : bool (default: True)
If True, a layer_norm (affine) will be applied to the output obtained
from the wav2vec model.
freeze : bool (default: True)
If True, the model is frozen. If False, the model will be trained
alongside with the rest of the pipeline.
freeze_feature_extractor : bool (default: False)
When freeze = False and freeze_feature_extractor True, the featue_extractor module of the model is Frozen. If False
all the wav2vec model will be trained including featue_extractor module.
apply_spec_augment : bool (default: False)
If True, the model will apply spec augment on the output of feature extractor
(inside huggingface Wav2VecModel() class).
If False, the model will not apply spec augment. We set this to false to prevent from doing it twice.
output_all_hiddens : bool (default: False)
If True, the forward function outputs the hidden states from all transformer layers.
For example wav2vec2-base has 12 transformer layers and the output is of shape (13, B, T, C),
where a projection of the CNN output is added to the beginning.
If False, the forward function outputs the hidden states only from the last transformer layer.
Example
-------
>>> inputs = torch.rand([10, 600])
>>> model_hub = "facebook/wav2vec2-base-960h"
>>> save_path = "savedir"
>>> model = Wav2Vec2(model_hub, save_path)
>>> outputs = model(inputs)
"""
def __init__(
self,
source,
save_path,
output_norm=False,
freeze=False,
freeze_feature_extractor=False,
apply_spec_augment=False,
output_all_hiddens=False,
):
super().__init__(source=source, save_path=save_path, freeze=freeze)
self.model.config.apply_spec_augment = apply_spec_augment
# We check if inputs need to be normalized w.r.t pretrained wav2vec2
self.load_feature_extractor(source, cache_dir=save_path)
self.normalize_wav = self.feature_extractor.do_normalize
self.freeze_feature_extractor = freeze_feature_extractor
if not self.freeze and self.freeze_feature_extractor:
logger.warning(
"speechbrain.lobes.models.huggingface_transformers.wav2vec2 - wav2vec 2.0 feature extractor is frozen."
)
self.model.feature_extractor.eval()
for param in self.model.feature_extractor.parameters():
param.requires_grad = False
self.output_norm = output_norm
self.output_all_hiddens = output_all_hiddens
def _modify_state_dict(self, path, replacables=["wav2vec2"]):
"""A custom loading ensures SpeechBrain compatibility for Pretrain and model
de/serialization. Here, the scope is to remove '.wav2vec2' before loading.
Arguments
---------
path : str
Checkpoint path, file name relative to the repo root.
replacables : List[str]
State dict sub-keys that if found, shall be dropped (incl. the 'model.' parent key), elevating key structures.
Returns
-------
modified_state_dict : see torch.load
SpeechBrain-valid deserialized pretrained model.
"""
modified_state_dict = {}
orig_state_dict = torch.load(path, map_location="cpu")
# We remove the .wav2vec2 in the state dict.
for key, params in orig_state_dict.items():
for tag in replacables:
if f"{tag}." in key:
save_key = key.replace(f"model.{tag}.", "")
modified_state_dict[save_key] = params
return modified_state_dict
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def forward(self, wav, wav_lens=None):
"""Takes an input waveform and return its corresponding wav2vec encoding.
Arguments
---------
wav : torch.Tensor (signal)
A batch of audio signals to transform to features.
wav_len : tensor
The relative length of the wav given in SpeechBrain format.
"""
# If we freeze, we simply remove all grads from the graph.
if self.freeze:
with torch.no_grad():
return self.extract_features(wav, wav_lens)
return self.extract_features(wav, wav_lens)
[docs]
class Wav2Vec2Pretrain(HFTransformersInterface):
"""This lobe enables the integration of HuggingFace
wav2vec2.0 models to be pretrained.
Source paper: https://arxiv.org/abs/2006.11477
Transformer from HuggingFace needs to be installed:
https://huggingface.co/transformers/installation.html
The return is an HuggingFace format and the mask indices that contains:
https://huggingface.co/transformers/model_doc/wav2vec2.html#wav2vec2forpretraining
For instance, it returns the loss that can be accessed with .loss
Arguments
---------
source : str
HuggingFace hub name: e.g "facebook/wav2vec2-large-lv60"
save_path : str
Path (dir) of the downloaded model.
mask_prob : float (default: 0.65)
Probability of masking a given frame. Default is taken from the paper.
mask_length : float (default: 10)
Length (i.e. number of consecutive masked frames). Default is taken from
the paper.
Example
-------
>>> inputs = torch.rand([10, 32000])
>>> model_hub = "facebook/wav2vec2-base-960h"
>>> save_path = "savedir"
>>> model = Wav2Vec2Pretrain(model_hub, save_path)
>>> outputs, _ = model(inputs, wav_lens=None)
"""
def __init__(
self,
source,
save_path,
mask_prob=0.65,
mask_length=10,
normalize_wav=True,
):
super().__init__(
source=source, save_path=save_path, for_pretraining=True
)
self.mask_prob = mask_prob
self.mask_length = mask_length
self.normalize_wav = normalize_wav
# We check if inputs need to be normalized w.r.t pretrained wav2vec2
[docs]
def forward(self, wav, wav_lens=None):
"""Takes an input waveform and return its corresponding wav2vec encoding.
Arguments
---------
wav : torch.Tensor (signal)
A batch of audio signals to transform to features.
wav_len : tensor
The relative length of the wav given in SpeechBrain format.
"""
batch_size, raw_sequence_length = wav.shape
if self.normalize_wav:
wav = F.layer_norm(wav, wav.shape)
sequence_length = self.model._get_feat_extract_output_lengths(
raw_sequence_length
).item()
# 1. Compute the indices that will be masked
mask_time_indices = _compute_mask_indices(
(batch_size, sequence_length),
mask_prob=self.mask_prob,
mask_length=self.mask_length,
)
torch_mask_time_indices = torch.tensor(
mask_time_indices, device=wav.device, dtype=torch.long,
)
padding_mask = make_padding_masks(wav, wav_len=wav_lens)
# 2. Sample the negative samples from the entire sequence.
# Fairseq does it only on the masked indices, but this only work if you
# have long sentences. For more versatily, we sample on the entire sequence.
# value.
full_sentence_indices = np.ones((batch_size, sequence_length))
# print(np.sum(mask_time_indices, axis=1))
negative_sample_indices = torch.tensor(
transformers.models.wav2vec2.modeling_wav2vec2._sample_negative_indices(
(batch_size, sequence_length),
num_negatives=self.config.num_negatives,
mask_time_indices=full_sentence_indices,
),
device=wav.device,
dtype=torch.long,
)
return (
self.model(
wav,
mask_time_indices=torch_mask_time_indices,
sampled_negative_indices=negative_sample_indices,
attention_mask=padding_mask,
),
torch_mask_time_indices,
)
[docs]
def override_config(self, config):
"""If the config needs to be overrided, here is the place
Arguments
---------
config : Wav2Vec2Config
The original config needs to be overrided.
Returns
-------
Overridded config
"""
config.output_hidden_states = True
return config