class Wav2Vec2Model(BaseFairseqModel):
def __init__(self, cfg: Wav2Vec2Config):
super().__init__()
self.cfg = cfg
feature_enc_layers = eval(cfg.conv_feature_layers)
self.embed = feature_enc_layers[-1][0]
self.feature_extractor = ConvFeatureExtractionModel(
conv_layers=feature_enc_layers,
dropout=0.0,
mode=cfg.extractor_mode,
conv_bias=cfg.conv_bias,
)
self.post_extract_proj = (nn.Linear(self.embed, cfg.encoder_embed_dim)
if self.embed != cfg.encoder_embed_dim
and not cfg.quantize_input else None)
self.mask_prob = cfg.mask_prob
self.mask_selection = cfg.mask_selection
self.mask_other = cfg.mask_other
self.mask_length = cfg.mask_length
self.no_mask_overlap = cfg.no_mask_overlap
self.mask_min_space = cfg.mask_min_space
self.mask_channel_prob = cfg.mask_channel_prob
self.mask_channel_selection = cfg.mask_channel_selection
self.mask_channel_other = cfg.mask_channel_other
self.mask_channel_length = cfg.mask_channel_length
self.no_mask_channel_overlap = cfg.no_mask_channel_overlap
self.mask_channel_min_space = cfg.mask_channel_min_space
self.dropout_input = nn.Dropout(cfg.dropout_input)
self.dropout_features = nn.Dropout(cfg.dropout_features)
self.feature_grad_mult = cfg.feature_grad_mult
self.quantizer = None
self.input_quantizer = None
self.n_negatives = cfg.num_negatives
self.cross_sample_negatives = cfg.cross_sample_negatives
self.codebook_negatives = cfg.codebook_negatives
self.negatives_from_everywhere = cfg.negatives_from_everywhere
self.logit_temp = cfg.logit_temp
final_dim = cfg.final_dim if cfg.final_dim > 0 else cfg.encoder_embed_dim
if cfg.quantize_targets:
vq_dim = cfg.latent_dim if cfg.latent_dim > 0 else final_dim
self.quantizer = GumbelVectorQuantizer(
dim=self.embed,
num_vars=cfg.latent_vars,
temp=cfg.latent_temp,
groups=cfg.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
)
self.project_q = nn.Linear(vq_dim, final_dim)
else:
self.project_q = nn.Linear(self.embed, final_dim)
if cfg.quantize_input:
if cfg.same_quantizer and self.quantizer is not None:
vq_dim = final_dim
self.input_quantizer = self.quantizer
else:
vq_dim = cfg.latent_dim if cfg.latent_dim > 0 else cfg.encoder_embed_dim
self.input_quantizer = GumbelVectorQuantizer(
dim=self.embed,
num_vars=cfg.latent_vars,
temp=cfg.latent_temp,
groups=cfg.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
)
self.project_inp = nn.Linear(vq_dim, cfg.encoder_embed_dim)
self.mask_emb = nn.Parameter(
torch.FloatTensor(cfg.encoder_embed_dim).uniform_())
self.encoder = TransformerEncoder(cfg)
self.layer_norm = LayerNorm(self.embed)
self.target_glu = None
if cfg.target_glu:
self.target_glu = nn.Sequential(
nn.Linear(final_dim, final_dim * 2), nn.GLU())
self.final_proj = nn.Linear(cfg.encoder_embed_dim, final_dim)
def upgrade_state_dict_named(self, state_dict, name):
super().upgrade_state_dict_named(state_dict, name)
"""Upgrade a (possibly old) state dict for new versions of fairseq."""
return state_dict
@classmethod
def build_model(cls, cfg: Wav2Vec2Config, task=None):
"""Build a new model instance."""
return cls(cfg)
def apply_mask(self, x, padding_mask):
B, T, C = x.shape
if self.mask_prob > 0:
mask_indices = compute_mask_indices(
(B, T),
padding_mask,
self.mask_prob,
self.mask_length,
self.mask_selection,
self.mask_other,
min_masks=2,
no_overlap=self.no_mask_overlap,
min_space=self.mask_min_space,
)
mask_indices = torch.from_numpy(mask_indices).to(x.device)
x[mask_indices] = self.mask_emb
else:
mask_indices = None
if self.mask_channel_prob > 0:
mask_channel_indices = compute_mask_indices(
(B, C),
None,
self.mask_channel_prob,
self.mask_channel_length,
self.mask_channel_selection,
self.mask_channel_other,
no_overlap=self.no_mask_channel_overlap,
min_space=self.mask_channel_min_space,
)
mask_channel_indices = (torch.from_numpy(mask_channel_indices).to(
x.device).unsqueeze(1).expand(-1, T, -1))
x[mask_channel_indices] = 0
return x, mask_indices
def sample_negatives(self, y, num):
if self.n_negatives == 0 and self.cross_sample_negatives == 0:
return y.new(0)
bsz, tsz, fsz = y.shape
y = y.view(-1, fsz) # BTC => (BxT)C
cross_high = tsz * bsz
high = tsz
with torch.no_grad():
assert high > 1, f"{bsz,tsz,fsz}"
if self.n_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.n_negatives).flatten())
neg_idxs = torch.randint(low=0,
high=high - 1,
size=(bsz, self.n_negatives * num))
neg_idxs[neg_idxs >= tszs] += 1
if self.cross_sample_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.cross_sample_negatives).flatten())
cross_neg_idxs = torch.randint(
low=0,
high=cross_high - 1,
size=(bsz, self.cross_sample_negatives * num),
)
cross_neg_idxs[cross_neg_idxs >= tszs] += 1
if self.n_negatives > 0:
for i in range(1, bsz):
neg_idxs[i] += i * high
else:
neg_idxs = cross_neg_idxs
if self.cross_sample_negatives > 0 and self.n_negatives > 0:
neg_idxs = torch.cat([neg_idxs, cross_neg_idxs], dim=1)
negs = y[neg_idxs.view(-1)]
negs = negs.view(bsz, num,
self.n_negatives + self.cross_sample_negatives,
fsz).permute(2, 0, 1, 3) # to NxBxTxC
return negs, neg_idxs
def compute_preds(self, x, y, negatives):
neg_is_pos = (y == negatives).all(-1)
y = y.unsqueeze(0)
targets = torch.cat([y, negatives], dim=0)
logits = torch.cosine_similarity(x.float(), targets.float(),
dim=-1).type_as(x)
logits /= self.logit_temp
if neg_is_pos.any():
logits[1:][neg_is_pos] = float("-inf")
return logits
def forward(self,
source,
padding_mask=None,
mask=True,
features_only=False):
if self.feature_grad_mult > 0:
features = self.feature_extractor(source)
if self.feature_grad_mult != 1.0:
features = GradMultiply.apply(features, self.feature_grad_mult)
else:
with torch.no_grad():
features = self.feature_extractor(source)
features_pen = features.float().pow(2).mean()
features = features.transpose(1, 2)
features = self.layer_norm(features)
unmasked_features = features.clone()
if padding_mask is not None:
extra = padding_mask.size(1) % features.size(1)
if extra > 0:
padding_mask = padding_mask[:, :-extra]
padding_mask = padding_mask.view(padding_mask.size(0),
features.size(1), -1)
padding_mask = padding_mask.all(-1)
if self.post_extract_proj is not None:
features = self.post_extract_proj(features)
features = self.dropout_input(features)
unmasked_features = self.dropout_features(unmasked_features)
num_vars = None
code_ppl = None
prob_ppl = None
curr_temp = None
if self.input_quantizer:
q = self.input_quantizer(features, produce_targets=False)
features = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
features = self.project_inp(features)
if mask:
x, mask_indices = self.apply_mask(features, padding_mask)
if mask_indices is not None:
y = unmasked_features[mask_indices].view(
unmasked_features.size(0), -1, unmasked_features.size(-1))
else:
y = unmasked_features
else:
x = features
y = unmasked_features
mask_indices = None
x = self.encoder(x, padding_mask=padding_mask)
if features_only:
return {"x": x, "padding_mask": padding_mask}
if self.quantizer:
q = self.quantizer(y, produce_targets=False)
y = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
y = self.project_q(y)
if self.negatives_from_everywhere:
neg_cands, *_ = self.quantizer(unmasked_features,
produce_targets=False)
negs, _ = self.sample_negatives(neg_cands, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
if self.codebook_negatives > 0:
cb_negs = self.quantizer.sample_from_codebook(
y.size(0) * y.size(1), self.codebook_negatives)
cb_negs = cb_negs.view(self.codebook_negatives, y.size(0),
y.size(1), -1) # order doesnt matter
cb_negs = self.project_q(cb_negs)
negs = torch.cat([negs, cb_negs], dim=0)
else:
y = self.project_q(y)
if self.negatives_from_everywhere:
negs, _ = self.sample_negatives(unmasked_features, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
x = x[mask_indices].view(x.size(0), -1, x.size(-1))
if self.target_glu:
y = self.target_glu(y)
negs = self.target_glu(negs)
x = self.final_proj(x)
x = self.compute_preds(x, y, negs)
result = {
"x": x,
"padding_mask": padding_mask,
"features_pen": features_pen
}
if prob_ppl is not None:
result["prob_perplexity"] = prob_ppl
result["code_perplexity"] = code_ppl
result["num_vars"] = num_vars
result["temp"] = curr_temp
return result
def quantize(self, x):
assert self.quantizer is not None
x = self.feature_extractor(x)
x = x.transpose(1, 2)
x = self.layer_norm(x)
return self.quantizer.forward_idx(x)
def extract_features(self, source, padding_mask, mask=False):
res = self.forward(source, padding_mask, mask=mask, features_only=True)
return res["x"], res["padding_mask"]
def get_logits(self, net_output):
logits = net_output["x"]
logits = logits.transpose(0, 2)
logits = logits.reshape(-1, logits.size(-1))
return logits
def get_targets(self, sample, net_output, expand_steps=True):
x = net_output["x"]
return x.new_zeros(x.size(1) * x.size(2), dtype=torch.long)
def get_extra_losses(self, net_output):
pen = []
if "prob_perplexity" in net_output:
pen.append(
(net_output["num_vars"] - net_output["prob_perplexity"]) /
net_output["num_vars"])
if "features_pen" in net_output:
pen.append(net_output["features_pen"])
return pen
def remove_pretraining_modules(self):
self.quantizer = None
self.project_q = None
self.target_glu = None
self.final_proj = None
class Wav2Vec2Model(BaseFairseqModel):
def __init__(self, cfg: Wav2Vec2Config):
super().__init__()
self.cfg = cfg
feature_enc_layers = eval(cfg.conv_feature_layers)
self.embed = feature_enc_layers[-1][0]
self.feature_extractor = ConvFeatureExtractionModel(
conv_layers=feature_enc_layers,
dropout=0.0,
mode=cfg.extractor_mode,
conv_bias=cfg.conv_bias,
)
self.post_extract_proj = (nn.Linear(self.embed, cfg.encoder_embed_dim)
if self.embed != cfg.encoder_embed_dim
and not cfg.quantize_input else None)
self.mask_prob = cfg.mask_prob
self.mask_selection = cfg.mask_selection
self.mask_other = cfg.mask_other
self.mask_length = cfg.mask_length
self.no_mask_overlap = cfg.no_mask_overlap
self.mask_min_space = cfg.mask_min_space
self.mask_channel_prob = cfg.mask_channel_prob
self.mask_channel_before = cfg.mask_channel_before
self.mask_channel_selection = cfg.mask_channel_selection
self.mask_channel_other = cfg.mask_channel_other
self.mask_channel_length = cfg.mask_channel_length
self.no_mask_channel_overlap = cfg.no_mask_channel_overlap
self.mask_channel_min_space = cfg.mask_channel_min_space
self.dropout_input = nn.Dropout(cfg.dropout_input)
self.dropout_features = nn.Dropout(cfg.dropout_features)
self.feature_grad_mult = cfg.feature_grad_mult
self.quantizer = None
self.input_quantizer = None
self.n_negatives = cfg.num_negatives
self.cross_sample_negatives = cfg.cross_sample_negatives
self.codebook_negatives = cfg.codebook_negatives
self.negatives_from_everywhere = cfg.negatives_from_everywhere
self.logit_temp = cfg.logit_temp
final_dim = cfg.final_dim if cfg.final_dim > 0 else cfg.encoder_embed_dim
if cfg.quantize_targets:
vq_dim = cfg.latent_dim if cfg.latent_dim > 0 else final_dim
self.quantizer = GumbelVectorQuantizer(
dim=self.embed,
num_vars=cfg.latent_vars,
temp=cfg.latent_temp,
groups=cfg.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
weight_proj_depth=cfg.quantizer_depth,
weight_proj_factor=cfg.quantizer_factor,
)
self.project_q = nn.Linear(vq_dim, final_dim)
else:
self.project_q = nn.Linear(self.embed, final_dim)
if cfg.quantize_input:
if cfg.same_quantizer and self.quantizer is not None:
vq_dim = final_dim
self.input_quantizer = self.quantizer
else:
vq_dim = cfg.latent_dim if cfg.latent_dim > 0 else cfg.encoder_embed_dim
self.input_quantizer = GumbelVectorQuantizer(
dim=self.embed,
num_vars=cfg.latent_vars,
temp=cfg.latent_temp,
groups=cfg.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
weight_proj_depth=cfg.quantizer_depth,
weight_proj_factor=cfg.quantizer_factor,
)
self.project_inp = nn.Linear(vq_dim, cfg.encoder_embed_dim)
self.mask_emb = nn.Parameter(
torch.FloatTensor(cfg.encoder_embed_dim).uniform_())
self.encoder = TransformerEncoder(cfg)
self.layer_norm = LayerNorm(self.embed)
self.target_glu = None
if cfg.target_glu:
self.target_glu = nn.Sequential(
nn.Linear(final_dim, final_dim * 2), nn.GLU())
self.final_proj = nn.Linear(cfg.encoder_embed_dim, final_dim)
def upgrade_state_dict_named(self, state_dict, name):
super().upgrade_state_dict_named(state_dict, name)
"""Upgrade a (possibly old) state dict for new versions of fairseq."""
return state_dict
@classmethod
def build_model(cls, cfg: Wav2Vec2Config, task=None):
"""Build a new model instance."""
return cls(cfg)
def apply_mask(
self,
x,
padding_mask,
mask_indices=None,
mask_channel_indices=None,
):
B, T, C = x.shape
if self.mask_channel_prob > 0 and self.mask_channel_before:
mask_channel_indices = compute_mask_indices(
(B, C),
None,
self.mask_channel_prob,
self.mask_channel_length,
self.mask_channel_selection,
self.mask_channel_other,
no_overlap=self.no_mask_channel_overlap,
min_space=self.mask_channel_min_space,
)
mask_channel_indices = (torch.from_numpy(mask_channel_indices).to(
x.device).unsqueeze(1).expand(-1, T, -1))
x[mask_channel_indices] = 0
if self.mask_prob > 0:
if mask_indices is None:
mask_indices = compute_mask_indices(
(B, T),
padding_mask,
self.mask_prob,
self.mask_length,
self.mask_selection,
self.mask_other,
min_masks=2,
no_overlap=self.no_mask_overlap,
min_space=self.mask_min_space,
)
mask_indices = torch.from_numpy(mask_indices).to(x.device)
x = index_put(x, mask_indices, self.mask_emb)
else:
mask_indices = None
if self.mask_channel_prob > 0 and not self.mask_channel_before:
if mask_channel_indices is None:
mask_channel_indices = compute_mask_indices(
(B, C),
None,
self.mask_channel_prob,
self.mask_channel_length,
self.mask_channel_selection,
self.mask_channel_other,
no_overlap=self.no_mask_channel_overlap,
min_space=self.mask_channel_min_space,
)
mask_channel_indices = (
torch.from_numpy(mask_channel_indices).to(
x.device).unsqueeze(1).expand(-1, T, -1))
x = index_put(x, mask_channel_indices, 0)
return x, mask_indices
def sample_negatives(self, y, num, padding_count=None):
if self.n_negatives == 0 and self.cross_sample_negatives == 0:
return y.new(0)
bsz, tsz, fsz = y.shape
y = y.view(-1, fsz) # BTC => (BxT)C
# FIXME: what happens if padding_count is specified?
cross_high = tsz * bsz
high = tsz - (padding_count or 0)
with torch.no_grad():
assert high > 1, f"{bsz,tsz,fsz}"
if self.n_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.n_negatives).flatten())
neg_idxs = torch.randint(low=0,
high=high - 1,
size=(bsz, self.n_negatives * num))
neg_idxs[neg_idxs >= tszs] += 1
if self.cross_sample_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.cross_sample_negatives).flatten())
cross_neg_idxs = torch.randint(
low=0,
high=cross_high - 1,
size=(bsz, self.cross_sample_negatives * num),
)
cross_neg_idxs[cross_neg_idxs >= tszs] += 1
if self.n_negatives > 0:
for i in range(1, bsz):
neg_idxs[i] += i * high
else:
neg_idxs = cross_neg_idxs
if self.cross_sample_negatives > 0 and self.n_negatives > 0:
neg_idxs = torch.cat([neg_idxs, cross_neg_idxs], dim=1)
negs = y[neg_idxs.view(-1)]
negs = negs.view(bsz, num,
self.n_negatives + self.cross_sample_negatives,
fsz).permute(2, 0, 1, 3) # to NxBxTxC
return negs, neg_idxs
def compute_preds(self, x, y, negatives):
neg_is_pos = (y == negatives).all(-1)
y = y.unsqueeze(0)
targets = torch.cat([y, negatives], dim=0)
logits = torch.cosine_similarity(x.float(), targets.float(),
dim=-1).type_as(x)
logits = logits / self.logit_temp
if is_xla_tensor(logits) or neg_is_pos.any():
fillval = -float(2**30)
if not hasattr(self, "_inftensor"):
self._inftensor = (torch.tensor(fillval).to(x.device)
if is_xla_tensor(logits) else float("-inf"))
logits[1:] = index_put(logits[1:], neg_is_pos, self._inftensor)
return logits
def _get_feat_extract_output_lengths(self,
input_lengths: torch.LongTensor):
"""
Computes the output length of the convolutional layers
"""
def _conv_out_length(input_length, kernel_size, stride):
return torch.floor((input_length - kernel_size) / stride + 1)
conv_cfg_list = eval(self.cfg.conv_feature_layers)
for i in range(len(conv_cfg_list)):
input_lengths = _conv_out_length(input_lengths,
conv_cfg_list[i][1],
conv_cfg_list[i][2])
return input_lengths.to(torch.long)
def forward(
self,
source,
padding_mask=None,
mask=True,
features_only=False,
layer=None,
mask_indices=None,
mask_channel_indices=None,
padding_count=None,
):
if self.feature_grad_mult > 0:
features = self.feature_extractor(source)
if self.feature_grad_mult != 1.0:
features = GradMultiply.apply(features, self.feature_grad_mult)
else:
with torch.no_grad():
features = self.feature_extractor(source)
features_pen = features.float().pow(2).mean()
features = features.transpose(1, 2)
features = self.layer_norm(features)
unmasked_features = features.clone()
if padding_mask is not None and padding_mask.any():
input_lengths = (1 - padding_mask.long()).sum(-1)
# apply conv formula to get real output_lengths
output_lengths = self._get_feat_extract_output_lengths(
input_lengths)
padding_mask = torch.zeros(features.shape[:2],
dtype=features.dtype,
device=features.device)
# these two operations makes sure that all values
# before the output lengths indices are attended to
padding_mask[(
torch.arange(padding_mask.shape[0],
device=padding_mask.device),
output_lengths - 1,
)] = 1
padding_mask = (
1 - padding_mask.flip([-1]).cumsum(-1).flip([-1])).bool()
else:
padding_mask = None
if self.post_extract_proj is not None:
features = self.post_extract_proj(features)
features = self.dropout_input(features)
unmasked_features = self.dropout_features(unmasked_features)
num_vars = None
code_ppl = None
prob_ppl = None
curr_temp = None
if self.input_quantizer:
q = self.input_quantizer(features, produce_targets=False)
features = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
features = self.project_inp(features)
if mask:
x, mask_indices = self.apply_mask(
features,
padding_mask,
mask_indices=mask_indices,
mask_channel_indices=mask_channel_indices,
)
if not is_xla_tensor(x) and mask_indices is not None:
# tpu-comment: reducing the size in a dynamic way causes
# too many recompilations on xla.
y = unmasked_features[mask_indices].view(
unmasked_features.size(0), -1, unmasked_features.size(-1))
else:
y = unmasked_features
else:
x = features
y = unmasked_features
mask_indices = None
x, layer_results = self.encoder(x,
padding_mask=padding_mask,
layer=layer)
if features_only:
return {
"x": x,
"padding_mask": padding_mask,
"features": unmasked_features,
"layer_results": layer_results,
}
if self.quantizer:
q = self.quantizer(y, produce_targets=False)
y = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
y = self.project_q(y)
if self.negatives_from_everywhere:
neg_cands = self.quantizer(unmasked_features,
produce_targets=False)["x"]
negs, _ = self.sample_negatives(
neg_cands,
y.size(1),
padding_count=padding_count,
)
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(
y,
y.size(1),
padding_count=padding_count,
)
if self.codebook_negatives > 0:
cb_negs = self.quantizer.sample_from_codebook(
y.size(0) * y.size(1), self.codebook_negatives)
cb_negs = cb_negs.view(self.codebook_negatives, y.size(0),
y.size(1), -1) # order doesnt matter
cb_negs = self.project_q(cb_negs)
negs = torch.cat([negs, cb_negs], dim=0)
else:
y = self.project_q(y)
if self.negatives_from_everywhere:
negs, _ = self.sample_negatives(
unmasked_features,
y.size(1),
padding_count=padding_count,
)
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(
y,
y.size(1),
padding_count=padding_count,
)
if not is_xla_tensor(x):
# tpu-comment: reducing the size in a dynamic way causes
# too many recompilations on xla.
x = x[mask_indices].view(x.size(0), -1, x.size(-1))
if self.target_glu:
y = self.target_glu(y)
negs = self.target_glu(negs)
x = self.final_proj(x)
x = self.compute_preds(x, y, negs)
result = {
"x": x,
"padding_mask": padding_mask,
"features_pen": features_pen,
}
if prob_ppl is not None:
result["prob_perplexity"] = prob_ppl
result["code_perplexity"] = code_ppl
result["num_vars"] = num_vars
result["temp"] = curr_temp
return result
def quantize(self, x):
assert self.quantizer is not None
x = self.feature_extractor(x)
x = x.transpose(1, 2)
x = self.layer_norm(x)
return self.quantizer.forward_idx(x)
def extract_features(self, source, padding_mask, mask=False, layer=None):
res = self.forward(source,
padding_mask,
mask=mask,
features_only=True,
layer=layer)
return res
def get_logits(self, net_output):
logits = net_output["x"]
logits = logits.transpose(0, 2)
logits = logits.reshape(-1, logits.size(-1))
return logits
def get_targets(self, sample, net_output, expand_steps=True):
x = net_output["x"]
return x.new_zeros(x.size(1) * x.size(2), dtype=torch.long)
def get_extra_losses(self, net_output):
pen = []
if "prob_perplexity" in net_output:
pen.append(
(net_output["num_vars"] - net_output["prob_perplexity"]) /
net_output["num_vars"])
if "features_pen" in net_output:
pen.append(net_output["features_pen"])
return pen
def remove_pretraining_modules(self):
self.quantizer = None
self.project_q = None
self.target_glu = None
self.final_proj = None
class Wav2Vec2Model(BaseFairseqModel):
@staticmethod
def add_args(parser):
"""Add model-specific arguments to the parser."""
parser.add_argument(
"--extractor-mode",
choices=["default", "layer_norm"],
help=
"mode for feature extractor. default has a single group norm with d groups in the first conv block, whereas layer_norm has layer norms in every block (meant to use with --normalize)",
)
parser.add_argument(
"--encoder-layers",
type=int,
metavar="L",
help="num encoder layers in the transformer",
)
parser.add_argument(
"--encoder-embed-dim",
type=int,
metavar="H",
help="encoder embedding dimension",
)
parser.add_argument(
"--encoder-ffn-embed-dim",
type=int,
metavar="F",
help="encoder embedding dimension for FFN",
)
parser.add_argument(
"--encoder-attention-heads",
type=int,
metavar="A",
help="num encoder attention heads",
)
parser.add_argument(
"--activation-fn",
choices=utils.get_available_activation_fns(),
help="activation function to use",
)
parser.add_argument(
"--dropout",
type=float,
metavar="D",
help="dropout probability for the transformer",
)
parser.add_argument(
"--attention-dropout",
type=float,
metavar="D",
help="dropout probability for attention weights",
)
parser.add_argument(
"--activation-dropout",
type=float,
metavar="D",
help="dropout probability after activation in FFN",
)
parser.add_argument(
"--final-dim",
type=int,
metavar="D",
help=
"project final representations and targets to this many dimensions",
)
parser.add_argument(
"--layer-norm-first",
action="store_true",
help="apply layernorm first in the transformer",
)
parser.add_argument(
"--encoder-layerdrop",
type=float,
help="probability of dropping a tarnsformer layer",
)
parser.add_argument(
"--conv-feature-layers",
type=str,
metavar="EXPR",
help=
"convolutional feature extraction layers [(dim, kernel_size, stride), ...]",
)
parser.add_argument("--logit-temp",
type=float,
help="temperature to divide logits by")
parser.add_argument("--quantize-targets",
action="store_true",
help="use quantized targets")
parser.add_argument("--quantize-input",
action="store_true",
help="use quantized inputs")
parser.add_argument(
"--feature-grad-mult",
type=float,
help="multiply feature extractor var grads by this",
)
parser.add_argument(
"--latent-vars",
type=int,
metavar="N",
help="number of latent variables V in each group of the codebook",
)
parser.add_argument(
"--latent-groups",
type=int,
metavar="N",
help="number of groups G of latent variables in the codebook",
)
parser.add_argument(
"--latent-dim",
type=int,
metavar="N",
help=
"if set, uses this dimensionality for latent variables. otherwise uses final_dim / latent_groups",
)
parser.add_argument("--mask-length", type=int, help="mask length")
parser.add_argument("--mask-prob",
type=float,
help="probability of replacing a token with mask")
parser.add_argument(
"--mask-selection",
type=str,
choices=["static", "uniform", "normal", "poisson"],
help="how to choose masks",
)
parser.add_argument(
"--mask-other",
type=float,
help=
"secondary mask argument (used for more complex distributions), see help in compute_mask_indices",
)
parser.add_argument(
"--no-mask-overlap",
action="store_true",
help="whether to allow masks to overlap",
)
parser.add_argument(
"--mask-min-space",
type=int,
help="min space between spans (if no overlap is enabled)",
)
parser.add_argument(
"--mask-channel-length",
type=int,
help="repeat the mask indices multiple times",
)
parser.add_argument(
"--mask-channel-prob",
type=float,
help="probability of replacing a token with mask",
)
parser.add_argument(
"--mask-channel-selection",
type=str,
choices=["static", "uniform", "normal", "poisson"],
help="how to choose masks",
)
parser.add_argument(
"--mask-channel-other",
type=float,
help=
"secondary mask argument (used for more complex distributions), see help in compute_mask_indices",
)
parser.add_argument(
"--no-mask-channel-overlap",
action="store_true",
help="whether to allow masks to overlap",
)
parser.add_argument(
"--mask-channel-min-space",
type=int,
help="min space between spans (if no overlap is enabled)",
)
parser.add_argument(
"--dropout-input",
type=float,
metavar="D",
help="dropout to apply to the input (after feat extr)",
)
parser.add_argument(
"--dropout-features",
type=float,
metavar="D",
help="dropout to apply to the features (after feat extr)",
)
parser.add_argument("--num-negatives",
type=int,
metavar="N",
help="number of negative examples")
parser.add_argument(
"--negatives-from-everywhere",
action="store_true",
help="sample negatives from everywhere, not just masked states",
)
parser.add_argument(
"--cross-sample-negatives",
type=int,
metavar="N",
help="num of cross sampled negatives",
)
parser.add_argument(
"--codebook-negatives",
type=int,
metavar="N",
help="num of codebook sampled negatives",
)
parser.add_argument(
"--conv-pos",
type=int,
metavar="N",
help="number of filters for convolutional positional embeddings",
)
parser.add_argument(
"--conv-pos-groups",
type=int,
metavar="N",
help="number of groups for convolutional positional embedding",
)
parser.add_argument(
"--latent-temp",
type=str,
metavar="D",
help=
"temperature for latent variable sampling. can be tuple of 3 values (start, end, decay)",
)
parser.add_argument("--target-glu",
action="store_true",
help="adds projection + glu to targets")
parser.add_argument("--conv-bias",
action="store_true",
help="include bias in conv encoder")
def __init__(self, args):
super().__init__()
self.args = args
feature_enc_layers = eval(args.conv_feature_layers)
self.embed = feature_enc_layers[-1][0]
self.feature_extractor = ConvFeatureExtractionModel(
conv_layers=feature_enc_layers,
dropout=0.0,
mode=args.extractor_mode,
conv_bias=args.conv_bias,
)
self.post_extract_proj = (nn.Linear(self.embed, args.encoder_embed_dim)
if self.embed != args.encoder_embed_dim
and not args.quantize_input else None)
self.mask_prob = args.mask_prob
self.mask_selection = args.mask_selection
self.mask_other = args.mask_other
self.mask_length = args.mask_length
self.no_mask_overlap = args.no_mask_overlap
self.mask_min_space = args.mask_min_space
self.mask_channel_prob = args.mask_channel_prob
self.mask_channel_selection = args.mask_channel_selection
self.mask_channel_other = args.mask_channel_other
self.mask_channel_length = args.mask_channel_length
self.no_mask_channel_overlap = args.no_mask_channel_overlap
self.mask_channel_min_space = args.mask_channel_min_space
self.dropout_input = nn.Dropout(args.dropout_input)
self.dropout_features = nn.Dropout(args.dropout_features)
self.feature_grad_mult = args.feature_grad_mult
self.quantizer = None
self.input_quantizer = None
self.n_negatives = args.num_negatives
self.cross_sample_negatives = args.cross_sample_negatives
self.codebook_negatives = args.codebook_negatives
self.negatives_from_everywhere = args.negatives_from_everywhere
self.logit_temp = args.logit_temp
if args.quantize_input:
vq_dim = args.latent_dim if args.latent_dim > 0 else args.encoder_embed_dim
self.input_quantizer = (GumbelVectorQuantizer(
dim=args.encoder_embed_dim,
num_vars=args.latent_vars,
temp=eval(args.latent_temp),
groups=args.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
) if not args.same_quantizer else self.quantizer)
self.project_inp = nn.Linear(vq_dim, args.encoder_embed_dim)
final_dim = args.final_dim if args.final_dim > 0 else args.encoder_embed_dim
if args.quantize_targets:
vq_dim = args.latent_dim if args.latent_dim > 0 else final_dim
self.quantizer = GumbelVectorQuantizer(
dim=self.embed,
num_vars=args.latent_vars,
temp=eval(args.latent_temp),
groups=args.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
)
self.project_q = nn.Linear(vq_dim, final_dim)
else:
self.project_q = nn.Linear(self.embed, final_dim)
self.mask_emb = nn.Parameter(
torch.FloatTensor(args.encoder_embed_dim).uniform_())
self.encoder = TransformerEncoder(args)
self.layer_norm = LayerNorm(self.embed)
self.target_glu = None
if args.target_glu:
self.target_glu = nn.Sequential(
nn.Linear(final_dim, final_dim * 2), nn.GLU())
self.final_proj = nn.Linear(args.encoder_embed_dim, final_dim)
def upgrade_state_dict_named(self, state_dict, name):
super().upgrade_state_dict_named(state_dict, name)
"""Upgrade a (possibly old) state dict for new versions of fairseq."""
return state_dict
@classmethod
def build_model(cls, args, task=None):
"""Build a new model instance."""
# make sure all arguments are present
base_architecture(args)
return cls(args)
def apply_mask(self, x, padding_mask):
B, T, C = x.shape
if self.mask_prob > 0:
mask_indices = compute_mask_indices(
(B, T),
padding_mask,
self.mask_prob,
self.mask_length,
self.mask_selection,
self.mask_other,
min_masks=2,
no_overlap=self.no_mask_overlap,
min_space=self.mask_min_space,
)
mask_indices = torch.from_numpy(mask_indices).to(x.device)
x[mask_indices] = self.mask_emb
else:
mask_indices = None
if self.mask_channel_prob > 0:
mask_channel_indices = compute_mask_indices(
(B, C),
None,
self.mask_channel_prob,
self.mask_channel_length,
self.mask_channel_selection,
self.mask_channel_other,
no_overlap=self.no_mask_channel_overlap,
min_space=self.mask_channel_min_space,
)
mask_channel_indices = (torch.from_numpy(mask_channel_indices).to(
x.device).unsqueeze(1).expand(-1, T, -1))
x[mask_channel_indices] = 0
return x, mask_indices
def sample_negatives(self, y, num):
if self.n_negatives == 0 and self.cross_sample_negatives == 0:
return y.new(0)
bsz, tsz, fsz = y.shape
y = y.view(-1, fsz) # BTC => (BxT)C
cross_high = tsz * bsz
high = tsz
with torch.no_grad():
assert high > 1, f"{bsz,tsz,fsz}"
if self.n_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.n_negatives).flatten())
neg_idxs = torch.randint(low=0,
high=high - 1,
size=(bsz, self.n_negatives * num))
neg_idxs[neg_idxs >= tszs] += 1
if self.cross_sample_negatives > 0:
tszs = (buffered_arange(num).unsqueeze(-1).expand(
-1, self.cross_sample_negatives).flatten())
cross_neg_idxs = torch.randint(
low=0,
high=cross_high - 1,
size=(bsz, self.cross_sample_negatives * num),
)
cross_neg_idxs[cross_neg_idxs >= tszs] += 1
if self.n_negatives > 0:
for i in range(1, bsz):
neg_idxs[i] += i * high
else:
neg_idxs = cross_neg_idxs
if self.cross_sample_negatives > 0 and self.n_negatives > 0:
neg_idxs = torch.cat([neg_idxs, cross_neg_idxs], dim=1)
negs = y[neg_idxs.view(-1)]
negs = negs.view(bsz, num,
self.n_negatives + self.cross_sample_negatives,
fsz).permute(2, 0, 1, 3) # to NxBxTxC
return negs, neg_idxs
def compute_preds(self, x, y, negatives):
neg_is_pos = (y == negatives).all(-1)
y = y.unsqueeze(0)
targets = torch.cat([y, negatives], dim=0)
logits = torch.cosine_similarity(x.float(), targets.float(),
dim=-1).type_as(x)
logits /= self.logit_temp
if neg_is_pos.any():
logits[1:][neg_is_pos] = float("-inf")
return logits
def forward(self,
source,
padding_mask=None,
mask=True,
features_only=False):
if self.feature_grad_mult > 0:
features = self.feature_extractor(source)
if self.feature_grad_mult != 1.0:
features = GradMultiply.apply(features, self.feature_grad_mult)
else:
with torch.no_grad():
features = self.feature_extractor(source)
features_pen = features.float().pow(2).mean()
features = features.transpose(1, 2)
features = self.layer_norm(features)
unmasked_features = features.clone()
if padding_mask is not None:
extra = padding_mask.size(1) % features.size(1)
if extra > 0:
padding_mask = padding_mask[:, :-extra]
padding_mask = padding_mask.view(padding_mask.size(0),
features.size(1), -1)
padding_mask = padding_mask.all(-1)
if self.post_extract_proj is not None:
features = self.post_extract_proj(features)
features = self.dropout_input(features)
unmasked_features = self.dropout_features(unmasked_features)
num_vars = None
code_ppl = None
prob_ppl = None
curr_temp = None
if self.input_quantizer:
q = self.input_quantizer(features, produce_targets=False)
features = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
features = self.project_inp(features)
if mask:
x, mask_indices = self.apply_mask(features, padding_mask)
if mask_indices is not None:
y = unmasked_features[mask_indices].view(
unmasked_features.size(0), -1, unmasked_features.size(-1))
else:
y = unmasked_features
else:
x = features
y = unmasked_features
mask_indices = None
x = self.encoder(x, padding_mask=padding_mask)
if features_only:
return {"x": x, "padding_mask": padding_mask}
if self.quantizer:
q = self.quantizer(y, produce_targets=False)
y = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
y = self.project_q(y)
if self.negatives_from_everywhere:
neg_cands, *_ = self.quantizer(unmasked_features,
produce_targets=False)
negs, _ = self.sample_negatives(neg_cands, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
if self.codebook_negatives > 0:
cb_negs = self.quantizer.sample_from_codebook(
y.size(0) * y.size(1), self.codebook_negatives)
cb_negs = cb_negs.view(self.codebook_negatives, y.size(0),
y.size(1), -1) # order doesnt matter
cb_negs = self.project_q(cb_negs)
negs = torch.cat([negs, cb_negs], dim=0)
else:
y = self.project_q(y)
if self.negatives_from_everywhere:
negs, _ = self.sample_negatives(unmasked_features, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
x = x[mask_indices].view(x.size(0), -1, x.size(-1))
if self.target_glu:
y = self.target_glu(y)
negs = self.target_glu(negs)
x = self.final_proj(x)
x = self.compute_preds(x, y, negs)
result = {
"x": x,
"padding_mask": padding_mask,
"features_pen": features_pen
}
if prob_ppl is not None:
result["prob_perplexity"] = prob_ppl
result["code_perplexity"] = code_ppl
result["num_vars"] = num_vars
result["temp"] = curr_temp
return result
def quantize(self, x):
assert self.quantizer is not None
x = self.feature_extractor(x)
x = x.transpose(1, 2)
x = self.layer_norm(x)
return self.quantizer.forward_idx(x)
def extract_features(self, source, padding_mask, mask=False):
res = self.forward(source, padding_mask, mask=mask, features_only=True)
return res["x"], res["padding_mask"]
def get_logits(self, net_output):
logits = net_output["x"]
logits = logits.transpose(0, 2)
logits = logits.reshape(-1, logits.size(-1))
return logits
def get_targets(self, sample, net_output, expand_steps=True):
x = net_output["x"]
return x.new_zeros(x.size(1) * x.size(2), dtype=torch.long)
def get_extra_losses(self, net_output):
pen = []
if "prob_perplexity" in net_output:
pen.append(
(net_output["num_vars"] - net_output["prob_perplexity"]) /
net_output["num_vars"])
if "features_pen" in net_output:
pen.append(net_output["features_pen"])
return pen
def remove_pretraining_modules(self):
self.quantizer = None
self.project_q = None
self.target_glu = None
self.final_proj = None
class DeCoAr2Model(BaseFairseqModel):
def __init__(self, args):
super().__init__()
self.args = args
self.post_extract_proj = nn.Linear(80, args.encoder_embed_dim)
self.mask_prob = args.mask_prob
self.mask_selection = args.mask_selection
self.mask_other = args.mask_other
self.mask_length = args.mask_length
self.no_mask_overlap = args.no_mask_overlap
self.mask_min_space = args.mask_min_space
self.mask_channel_prob = args.mask_channel_prob
self.mask_channel_selection = args.mask_channel_selection
self.mask_channel_other = args.mask_channel_other
self.mask_channel_length = args.mask_channel_length
self.no_mask_channel_overlap = args.no_mask_channel_overlap
self.mask_channel_min_space = args.mask_channel_min_space
self.dropout_input = nn.Dropout(args.dropout_input)
self.dropout_features = nn.Dropout(args.dropout_features)
self.feature_grad_mult = args.feature_grad_mult
self.quantizer = None
self.input_quantizer = None
self.n_negatives = args.num_negatives
self.cross_sample_negatives = args.cross_sample_negatives
self.codebook_negatives = args.codebook_negatives
self.negatives_from_everywhere = args.negatives_from_everywhere
self.logit_temp = args.logit_temp
if args.quantize_input:
vq_dim = args.latent_dim if args.latent_dim > 0 else args.encoder_embed_dim
self.input_quantizer = (GumbelVectorQuantizer(
dim=args.encoder_embed_dim,
num_vars=args.latent_vars,
temp=eval(args.latent_temp),
groups=args.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
) if not args.same_quantizer else self.quantizer)
self.project_inp = nn.Linear(vq_dim, args.encoder_embed_dim)
final_dim = args.final_dim if args.final_dim > 0 else args.encoder_embed_dim
if args.quantize_targets:
vq_dim = args.latent_dim if args.latent_dim > 0 else final_dim
self.quantizer = GumbelVectorQuantizer(
dim=args.encoder_embed_dim,
num_vars=args.latent_vars,
temp=eval(args.latent_temp),
groups=args.latent_groups,
combine_groups=False,
vq_dim=vq_dim,
time_first=True,
)
self.project_q = nn.Linear(vq_dim, final_dim)
else:
self.project_q = nn.Linear(self.embed, final_dim)
self.mask_emb = nn.Parameter(
torch.FloatTensor(args.encoder_embed_dim).uniform_())
self.encoder = TransformerEncoder(args)
self.layer_norm = LayerNorm(self.embed)
self.target_glu = None
if args.target_glu:
self.target_glu = nn.Sequential(
nn.Linear(final_dim, final_dim * 2), nn.GLU())
self.final_proj = nn.Linear(args.encoder_embed_dim, final_dim)
def upgrade_state_dict_named(self, state_dict, name):
super().upgrade_state_dict_named(state_dict, name)
"""Upgrade a (possibly old) state dict for new versions of fairseq."""
return state_dict
@classmethod
def build_model(cls, args, task=None):
"""Build a new model instance."""
# make sure all arguments are present
base_architecture(args)
return cls(args)
def apply_mask(self, x, padding_mask):
B, T, C = x.shape
if self.mask_prob > 0:
mask_indices = compute_mask_indices(
(B, T),
padding_mask,
self.mask_prob,
self.mask_length,
self.mask_selection,
self.mask_other,
min_masks=2,
no_overlap=self.no_mask_overlap,
min_space=self.mask_min_space,
)
mask_indices = torch.from_numpy(mask_indices).to(x.device)
x[mask_indices] = self.mask_emb
else:
mask_indices = None
if self.mask_channel_prob > 0:
mask_channel_indices = compute_mask_indices(
(B, C),
None,
self.mask_channel_prob,
self.mask_channel_length,
self.mask_channel_selection,
self.mask_channel_other,
no_overlap=self.no_mask_channel_overlap,
min_space=self.mask_channel_min_space,
)
mask_channel_indices = (torch.from_numpy(mask_channel_indices).to(
x.device).unsqueeze(1).expand(-1, T, -1))
x[mask_channel_indices] = 0
return x, mask_indices
def forward(self,
source,
padding_mask=None,
mask=True,
features_only=False):
features = self.post_extract_proj(source)
unmasked_features = features.clone()
features = self.dropout_input(features)
unmasked_features = self.dropout_features(unmasked_features)
num_vars = None
code_ppl = None
prob_ppl = None
curr_temp = None
if self.input_quantizer:
q = self.input_quantizer(features, produce_targets=False)
features = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
features = self.project_inp(features)
if mask:
x, mask_indices = self.apply_mask(features, padding_mask)
if mask_indices is not None:
y = unmasked_features[mask_indices].view(
unmasked_features.size(0), -1, unmasked_features.size(-1))
else:
y = unmasked_features
else:
x = features
y = unmasked_features
mask_indices = None
x = self.encoder(x, padding_mask=padding_mask)
if features_only:
return {"x": x, "padding_mask": padding_mask}
if self.quantizer:
q = self.quantizer(y, produce_targets=False)
y = q["x"]
num_vars = q["num_vars"]
code_ppl = q["code_perplexity"]
prob_ppl = q["prob_perplexity"]
curr_temp = q["temp"]
y = self.project_q(y)
if self.negatives_from_everywhere:
neg_cands, *_ = self.quantizer(unmasked_features,
produce_targets=False)
negs, _ = self.sample_negatives(neg_cands, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
if self.codebook_negatives > 0:
cb_negs = self.quantizer.sample_from_codebook(
y.size(0) * y.size(1), self.codebook_negatives)
cb_negs = cb_negs.view(self.codebook_negatives, y.size(0),
y.size(1), -1) # order doesnt matter
cb_negs = self.project_q(cb_negs)
negs = torch.cat([negs, cb_negs], dim=0)
else:
y = self.project_q(y)
if self.negatives_from_everywhere:
negs, _ = self.sample_negatives(unmasked_features, y.size(1))
negs = self.project_q(negs)
else:
negs, _ = self.sample_negatives(y, y.size(1))
x = x[mask_indices].view(x.size(0), -1, x.size(-1))
if self.target_glu:
y = self.target_glu(y)
negs = self.target_glu(negs)
x = self.final_proj(x)
x = self.compute_preds(x, y, negs)
result = {
"x": x,
"padding_mask": padding_mask,
"features_pen": features_pen
}
if prob_ppl is not None:
result["prob_perplexity"] = prob_ppl
result["code_perplexity"] = code_ppl
result["num_vars"] = num_vars
result["temp"] = curr_temp
return result
def quantize(self, x):
assert self.quantizer is not None
x = self.feature_extractor(x)
x = x.transpose(1, 2)
x = self.layer_norm(x)
return self.quantizer.forward_idx(x)
def extract_features(self, source, padding_mask, mask=False):
res = self.forward(source, padding_mask, mask=mask, features_only=True)
return res["x"], res["padding_mask"]
def get_logits(self, net_output):
logits = net_output["x"]
logits = logits.transpose(0, 2)
logits = logits.reshape(-1, logits.size(-1))
return logits
def get_targets(self, sample, net_output, expand_steps=True):
x = net_output["x"]
return x.new_zeros(x.size(1) * x.size(2), dtype=torch.long)
def get_extra_losses(self, net_output):
pen = []
if "prob_perplexity" in net_output:
pen.append(
(net_output["num_vars"] - net_output["prob_perplexity"]) /
net_output["num_vars"])
if "features_pen" in net_output:
pen.append(net_output["features_pen"])
return pen
def remove_pretraining_modules(self):
self.quantizer = None
self.project_q = None
self.target_glu = None
self.final_proj = None