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PaddleSpeech/paddlespeech/t2s/models/transformer_tts/transformer_tts.py

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# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Modified from espnet(https://github.com/espnet/espnet)
"""Fastspeech2 related modules for paddle"""
from typing import Dict
from typing import Sequence
from typing import Tuple
import numpy
import paddle
import paddle.nn.functional as F
from paddle import nn
from typeguard import check_argument_types
from paddlespeech.t2s.modules.nets_utils import initialize
from paddlespeech.t2s.modules.nets_utils import make_non_pad_mask
from paddlespeech.t2s.modules.nets_utils import make_pad_mask
from paddlespeech.t2s.modules.style_encoder import StyleEncoder
from paddlespeech.t2s.modules.tacotron2.decoder import Postnet
from paddlespeech.t2s.modules.tacotron2.decoder import Prenet as DecoderPrenet
from paddlespeech.t2s.modules.tacotron2.encoder import Encoder as EncoderPrenet
from paddlespeech.t2s.modules.transformer.attention import MultiHeadedAttention
from paddlespeech.t2s.modules.transformer.decoder import Decoder
from paddlespeech.t2s.modules.transformer.embedding import PositionalEncoding
from paddlespeech.t2s.modules.transformer.embedding import ScaledPositionalEncoding
from paddlespeech.t2s.modules.transformer.encoder import TransformerEncoder
from paddlespeech.t2s.modules.transformer.mask import subsequent_mask
class TransformerTTS(nn.Layer):
"""TTS-Transformer module.
This is a module of text-to-speech Transformer described in `Neural Speech Synthesis
with Transformer Network`_, which convert the sequence of tokens into the sequence
of Mel-filterbanks.
.. _`Neural Speech Synthesis with Transformer Network`:
https://arxiv.org/pdf/1809.08895.pdf
Parameters
----------
idim : int
Dimension of the inputs.
odim : int
Dimension of the outputs.
embed_dim : int, optional
Dimension of character embedding.
eprenet_conv_layers : int, optional
Number of encoder prenet convolution layers.
eprenet_conv_chans : int, optional
Number of encoder prenet convolution channels.
eprenet_conv_filts : int, optional
Filter size of encoder prenet convolution.
dprenet_layers : int, optional
Number of decoder prenet layers.
dprenet_units : int, optional
Number of decoder prenet hidden units.
elayers : int, optional
Number of encoder layers.
eunits : int, optional
Number of encoder hidden units.
adim : int, optional
Number of attention transformation dimensions.
aheads : int, optional
Number of heads for multi head attention.
dlayers : int, optional
Number of decoder layers.
dunits : int, optional
Number of decoder hidden units.
postnet_layers : int, optional
Number of postnet layers.
postnet_chans : int, optional
Number of postnet channels.
postnet_filts : int, optional
Filter size of postnet.
use_scaled_pos_enc : pool, optional
Whether to use trainable scaled positional encoding.
use_batch_norm : bool, optional
Whether to use batch normalization in encoder prenet.
encoder_normalize_before : bool, optional
Whether to perform layer normalization before encoder block.
decoder_normalize_before : bool, optional
Whether to perform layer normalization before decoder block.
encoder_concat_after : bool, optional
Whether to concatenate attention layer's input and output in encoder.
decoder_concat_after : bool, optional
Whether to concatenate attention layer's input and output in decoder.
positionwise_layer_type : str, optional
Position-wise operation type.
positionwise_conv_kernel_size : int, optional
Kernel size in position wise conv 1d.
reduction_factor : int, optional
Reduction factor.
spk_embed_dim : int, optional
Number of speaker embedding dimenstions.
spk_embed_integration_type : str, optional
How to integrate speaker embedding.
use_gst : str, optional
Whether to use global style token.
gst_tokens : int, optional
The number of GST embeddings.
gst_heads : int, optional
The number of heads in GST multihead attention.
gst_conv_layers : int, optional
The number of conv layers in GST.
gst_conv_chans_list : Sequence[int], optional
List of the number of channels of conv layers in GST.
gst_conv_kernel_size : int, optional
Kernal size of conv layers in GST.
gst_conv_stride : int, optional
Stride size of conv layers in GST.
gst_gru_layers : int, optional
The number of GRU layers in GST.
gst_gru_units : int, optional
The number of GRU units in GST.
transformer_lr : float, optional
Initial value of learning rate.
transformer_warmup_steps : int, optional
Optimizer warmup steps.
transformer_enc_dropout_rate : float, optional
Dropout rate in encoder except attention and positional encoding.
transformer_enc_positional_dropout_rate : float, optional
Dropout rate after encoder positional encoding.
transformer_enc_attn_dropout_rate : float, optional
Dropout rate in encoder self-attention module.
transformer_dec_dropout_rate : float, optional
Dropout rate in decoder except attention & positional encoding.
transformer_dec_positional_dropout_rate : float, optional
Dropout rate after decoder positional encoding.
transformer_dec_attn_dropout_rate : float, optional
Dropout rate in deocoder self-attention module.
transformer_enc_dec_attn_dropout_rate : float, optional
Dropout rate in encoder-deocoder attention module.
init_type : str, optional
How to initialize transformer parameters.
init_enc_alpha : float, optional
Initial value of alpha in scaled pos encoding of the encoder.
init_dec_alpha : float, optional
Initial value of alpha in scaled pos encoding of the decoder.
eprenet_dropout_rate : float, optional
Dropout rate in encoder prenet.
dprenet_dropout_rate : float, optional
Dropout rate in decoder prenet.
postnet_dropout_rate : float, optional
Dropout rate in postnet.
use_masking : bool, optional
Whether to apply masking for padded part in loss calculation.
use_weighted_masking : bool, optional
Whether to apply weighted masking in loss calculation.
bce_pos_weight : float, optional
Positive sample weight in bce calculation (only for use_masking=true).
loss_type : str, optional
How to calculate loss.
use_guided_attn_loss : bool, optional
Whether to use guided attention loss.
num_heads_applied_guided_attn : int, optional
Number of heads in each layer to apply guided attention loss.
num_layers_applied_guided_attn : int, optional
Number of layers to apply guided attention loss.
List of module names to apply guided attention loss.
"""
def __init__(
self,
# network structure related
idim: int,
odim: int,
embed_dim: int=512,
eprenet_conv_layers: int=3,
eprenet_conv_chans: int=256,
eprenet_conv_filts: int=5,
dprenet_layers: int=2,
dprenet_units: int=256,
elayers: int=6,
eunits: int=1024,
adim: int=512,
aheads: int=4,
dlayers: int=6,
dunits: int=1024,
postnet_layers: int=5,
postnet_chans: int=256,
postnet_filts: int=5,
positionwise_layer_type: str="conv1d",
positionwise_conv_kernel_size: int=1,
use_scaled_pos_enc: bool=True,
use_batch_norm: bool=True,
encoder_normalize_before: bool=True,
decoder_normalize_before: bool=True,
encoder_concat_after: bool=False,
decoder_concat_after: bool=False,
reduction_factor: int=1,
spk_embed_dim: int=None,
spk_embed_integration_type: str="add",
use_gst: bool=False,
gst_tokens: int=10,
gst_heads: int=4,
gst_conv_layers: int=6,
gst_conv_chans_list: Sequence[int]=(32, 32, 64, 64, 128, 128),
gst_conv_kernel_size: int=3,
gst_conv_stride: int=2,
gst_gru_layers: int=1,
gst_gru_units: int=128,
# training related
transformer_enc_dropout_rate: float=0.1,
transformer_enc_positional_dropout_rate: float=0.1,
transformer_enc_attn_dropout_rate: float=0.1,
transformer_dec_dropout_rate: float=0.1,
transformer_dec_positional_dropout_rate: float=0.1,
transformer_dec_attn_dropout_rate: float=0.1,
transformer_enc_dec_attn_dropout_rate: float=0.1,
eprenet_dropout_rate: float=0.5,
dprenet_dropout_rate: float=0.5,
postnet_dropout_rate: float=0.5,
init_type: str="xavier_uniform",
init_enc_alpha: float=1.0,
init_dec_alpha: float=1.0,
use_guided_attn_loss: bool=True,
num_heads_applied_guided_attn: int=2,
num_layers_applied_guided_attn: int=2, ):
"""Initialize Transformer module."""
assert check_argument_types()
super().__init__()
# store hyperparameters
self.idim = idim
self.odim = odim
self.eos = idim - 1
self.spk_embed_dim = spk_embed_dim
self.reduction_factor = reduction_factor
self.use_gst = use_gst
self.use_scaled_pos_enc = use_scaled_pos_enc
self.use_guided_attn_loss = use_guided_attn_loss
if self.use_guided_attn_loss:
if num_layers_applied_guided_attn == -1:
self.num_layers_applied_guided_attn = elayers
else:
self.num_layers_applied_guided_attn = num_layers_applied_guided_attn
if num_heads_applied_guided_attn == -1:
self.num_heads_applied_guided_attn = aheads
else:
self.num_heads_applied_guided_attn = num_heads_applied_guided_attn
if self.spk_embed_dim is not None:
self.spk_embed_integration_type = spk_embed_integration_type
# use idx 0 as padding idx
self.padding_idx = 0
# set_global_initializer 会影响后面的全局，包括 create_parameter
initialize(self, init_type)
# get positional encoding layer type
transformer_pos_enc_layer_type = "scaled_abs_pos" if self.use_scaled_pos_enc else "abs_pos"
# define transformer encoder
if eprenet_conv_layers != 0:
# encoder prenet
encoder_input_layer = nn.Sequential(
EncoderPrenet(
idim=idim,
embed_dim=embed_dim,
elayers=0,
econv_layers=eprenet_conv_layers,
econv_chans=eprenet_conv_chans,
econv_filts=eprenet_conv_filts,
use_batch_norm=use_batch_norm,
dropout_rate=eprenet_dropout_rate,
padding_idx=self.padding_idx, ),
nn.Linear(eprenet_conv_chans, adim), )
else:
encoder_input_layer = nn.Embedding(
num_embeddings=idim,
embedding_dim=adim,
padding_idx=self.padding_idx)
self.encoder = TransformerEncoder(
idim=idim,
attention_dim=adim,
attention_heads=aheads,
linear_units=eunits,
num_blocks=elayers,
input_layer=encoder_input_layer,
dropout_rate=transformer_enc_dropout_rate,
positional_dropout_rate=transformer_enc_positional_dropout_rate,
attention_dropout_rate=transformer_enc_attn_dropout_rate,
pos_enc_layer_type=transformer_pos_enc_layer_type,
normalize_before=encoder_normalize_before,
concat_after=encoder_concat_after,
positionwise_layer_type=positionwise_layer_type,
positionwise_conv_kernel_size=positionwise_conv_kernel_size, )
# define GST
if self.use_gst:
self.gst = StyleEncoder(
idim=odim, # the input is mel-spectrogram
gst_tokens=gst_tokens,
gst_token_dim=adim,
gst_heads=gst_heads,
conv_layers=gst_conv_layers,
conv_chans_list=gst_conv_chans_list,
conv_kernel_size=gst_conv_kernel_size,
conv_stride=gst_conv_stride,
gru_layers=gst_gru_layers,
gru_units=gst_gru_units, )
# define projection layer
if self.spk_embed_dim is not None:
if self.spk_embed_integration_type == "add":
self.projection = nn.Linear(self.spk_embed_dim, adim)
else:
self.projection = nn.Linear(adim + self.spk_embed_dim, adim)
# define transformer decoder
if dprenet_layers != 0:
# decoder prenet
decoder_input_layer = nn.Sequential(
DecoderPrenet(
idim=odim,
n_layers=dprenet_layers,
n_units=dprenet_units,
dropout_rate=dprenet_dropout_rate, ),
nn.Linear(dprenet_units, adim), )
else:
decoder_input_layer = "linear"
# get positional encoding class
pos_enc_class = (ScaledPositionalEncoding
if self.use_scaled_pos_enc else PositionalEncoding)
self.decoder = Decoder(
odim=odim, # odim is needed when no prenet is used
attention_dim=adim,
attention_heads=aheads,
linear_units=dunits,
num_blocks=dlayers,
dropout_rate=transformer_dec_dropout_rate,
positional_dropout_rate=transformer_dec_positional_dropout_rate,
self_attention_dropout_rate=transformer_dec_attn_dropout_rate,
src_attention_dropout_rate=transformer_enc_dec_attn_dropout_rate,
input_layer=decoder_input_layer,
use_output_layer=False,
pos_enc_class=pos_enc_class,
normalize_before=decoder_normalize_before,
concat_after=decoder_concat_after, )
# define final projection
self.feat_out = nn.Linear(adim, odim * reduction_factor)
self.prob_out = nn.Linear(adim, reduction_factor)
# define postnet
self.postnet = (None if postnet_layers == 0 else Postnet(
idim=idim,
odim=odim,
n_layers=postnet_layers,
n_chans=postnet_chans,
n_filts=postnet_filts,
use_batch_norm=use_batch_norm,
dropout_rate=postnet_dropout_rate, ))
# 闭合的 initialize() 中的 set_global_initializer 的作用域，防止其影响到 self._reset_parameters()
nn.initializer.set_global_initializer(None)
self._reset_parameters(
init_enc_alpha=init_enc_alpha,
init_dec_alpha=init_dec_alpha, )
def _reset_parameters(self, init_enc_alpha: float, init_dec_alpha: float):
# initialize alpha in scaled positional encoding
if self.use_scaled_pos_enc:
init_enc_alpha = paddle.to_tensor(init_enc_alpha)
self.encoder.embed[-1].alpha = paddle.create_parameter(
shape=init_enc_alpha.shape,
dtype=str(init_enc_alpha.numpy().dtype),
default_initializer=paddle.nn.initializer.Assign(
init_enc_alpha))
init_dec_alpha = paddle.to_tensor(init_dec_alpha)
self.decoder.embed[-1].alpha = paddle.create_parameter(
shape=init_dec_alpha.shape,
dtype=str(init_dec_alpha.numpy().dtype),
default_initializer=paddle.nn.initializer.Assign(
init_dec_alpha))
def forward(
self,
text: paddle.Tensor,
text_lengths: paddle.Tensor,
speech: paddle.Tensor,
speech_lengths: paddle.Tensor,
spk_emb: paddle.Tensor=None,
) -> Tuple[paddle.Tensor, Dict[str, paddle.Tensor], paddle.Tensor]:
"""Calculate forward propagation.
Parameters
----------
text : Tensor(int64)
Batch of padded character ids (B, Tmax).
text_lengths : Tensor(int64)
Batch of lengths of each input batch (B,).
speech : Tensor
Batch of padded target features (B, Lmax, odim).
speech_lengths : Tensor(int64)
Batch of the lengths of each target (B,).
spk_emb : Tensor, optional
Batch of speaker embeddings (B, spk_embed_dim).
Returns
----------
Tensor
Loss scalar value.
Dict
Statistics to be monitored.
"""
# input of embedding must be int64
text_lengths = paddle.cast(text_lengths, 'int64')
# Add eos at the last of sequence
text = numpy.pad(text.numpy(), ((0, 0), (0, 1)), 'constant')
xs = paddle.to_tensor(text, dtype='int64')
for i, l in enumerate(text_lengths):
xs[i, l] = self.eos
ilens = text_lengths + 1
ys = speech
olens = paddle.cast(speech_lengths, 'int64')
# make labels for stop prediction
labels = make_pad_mask(olens - 1)
labels = numpy.pad(
labels.numpy(), ((0, 0), (0, 1)), 'constant', constant_values=1.0)
labels = paddle.to_tensor(labels)
labels = paddle.cast(labels, dtype="float32")
# labels = F.pad(labels, [0, 1], "constant", 1.0)
# calculate transformer outputs
after_outs, before_outs, logits = self._forward(xs, ilens, ys, olens,
spk_emb)
# modifiy mod part of groundtruth
if self.reduction_factor > 1:
olens = paddle.to_tensor(
[olen - olen % self.reduction_factor for olen in olens.numpy()])
max_olen = max(olens)
ys = ys[:, :max_olen]
labels = labels[:, :max_olen]
labels[:, -1] = 1.0 # make sure at least one frame has 1
need_dict = {}
need_dict['encoder'] = self.encoder
need_dict['decoder'] = self.decoder
need_dict[
'num_heads_applied_guided_attn'] = self.num_heads_applied_guided_attn
need_dict[
'num_layers_applied_guided_attn'] = self.num_layers_applied_guided_attn
need_dict['use_scaled_pos_enc'] = self.use_scaled_pos_enc
return after_outs, before_outs, logits, ys, labels, olens, ilens, need_dict
def _forward(
self,
xs: paddle.Tensor,
ilens: paddle.Tensor,
ys: paddle.Tensor,
olens: paddle.Tensor,
spk_emb: paddle.Tensor,
) -> Tuple[paddle.Tensor, paddle.Tensor, paddle.Tensor]:
# forward encoder
x_masks = self._source_mask(ilens)
hs, h_masks = self.encoder(xs, x_masks)
# integrate with GST
if self.use_gst:
style_embs = self.gst(ys)
hs = hs + style_embs.unsqueeze(1)
# integrate speaker embedding
if self.spk_embed_dim is not None:
hs = self._integrate_with_spk_embed(hs, spk_emb)
# thin out frames for reduction factor (B, Lmax, odim) -> (B, Lmax//r, odim)
if self.reduction_factor > 1:
ys_in = ys[:, self.reduction_factor - 1::self.reduction_factor]
olens_in = olens.new(
[olen // self.reduction_factor for olen in olens])
else:
ys_in, olens_in = ys, olens
# add first zero frame and remove last frame for auto-regressive
ys_in = self._add_first_frame_and_remove_last_frame(ys_in)
# forward decoder
y_masks = self._target_mask(olens_in)
zs, _ = self.decoder(ys_in, y_masks, hs, h_masks)
# (B, Lmax//r, odim * r) -> (B, Lmax//r * r, odim)
before_outs = self.feat_out(zs).reshape([zs.shape[0], -1, self.odim])
# (B, Lmax//r, r) -> (B, Lmax//r * r)
logits = self.prob_out(zs).reshape([zs.shape[0], -1])
# postnet -> (B, Lmax//r * r, odim)
if self.postnet is None:
after_outs = before_outs
else:
after_outs = before_outs + self.postnet(
before_outs.transpose([0, 2, 1])).transpose([0, 2, 1])
return after_outs, before_outs, logits
def inference(
self,
text: paddle.Tensor,
speech: paddle.Tensor=None,
spk_emb: paddle.Tensor=None,
threshold: float=0.5,
minlenratio: float=0.0,
maxlenratio: float=10.0,
use_teacher_forcing: bool=False,
) -> Tuple[paddle.Tensor, paddle.Tensor, paddle.Tensor]:
"""Generate the sequence of features given the sequences of characters.
Parameters
----------
text : Tensor(int64)
Input sequence of characters (T,).
speech : Tensor, optional
Feature sequence to extract style (N, idim).
spk_emb : Tensor, optional
Speaker embedding vector (spk_embed_dim,).
threshold : float, optional
Threshold in inference.
minlenratio : float, optional
Minimum length ratio in inference.
maxlenratio : float, optional
Maximum length ratio in inference.
use_teacher_forcing : bool, optional
Whether to use teacher forcing.
Returns
----------
Tensor
Output sequence of features (L, odim).
Tensor
Output sequence of stop probabilities (L,).
Tensor
Encoder-decoder (source) attention weights (#layers, #heads, L, T).
"""
# input of embedding must be int64
y = speech
# add eos at the last of sequence
text = numpy.pad(
text.numpy(), (0, 1), 'constant', constant_values=self.eos)
x = paddle.to_tensor(text, dtype='int64')
# inference with teacher forcing
if use_teacher_forcing:
assert speech is not None, "speech must be provided with teacher forcing."
# get teacher forcing outputs
xs, ys = x.unsqueeze(0), y.unsqueeze(0)
spk_emb = None if spk_emb is None else spk_emb.unsqueeze(0)
ilens = paddle.to_tensor(
[xs.shape[1]], dtype=paddle.int64, place=xs.place)
olens = paddle.to_tensor(
[ys.shape[1]], dtype=paddle.int64, place=ys.place)
outs, *_ = self._forward(xs, ilens, ys, olens, spk_emb)
# get attention weights
att_ws = []
for i in range(len(self.decoder.decoders)):
att_ws += [self.decoder.decoders[i].src_attn.attn]
# (B, L, H, T_out, T_in)
att_ws = paddle.stack(att_ws, axis=1)
return outs[0], None, att_ws[0]
# forward encoder
xs = x.unsqueeze(0)
hs, _ = self.encoder(xs, None)
# integrate GST
if self.use_gst:
style_embs = self.gst(y.unsqueeze(0))
hs = hs + style_embs.unsqueeze(1)
# integrate speaker embedding
if spk_emb is not None:
spk_emb = spk_emb.unsqueeze(0)
hs = self._integrate_with_spk_embed(hs, spk_emb)
# set limits of length
maxlen = int(hs.shape[1] * maxlenratio / self.reduction_factor)
minlen = int(hs.shape[1] * minlenratio / self.reduction_factor)
# initialize
idx = 0
ys = paddle.zeros([1, 1, self.odim])
outs, probs = [], []
# forward decoder step-by-step
z_cache = None
while True:
# update index
idx += 1
# calculate output and stop prob at idx-th step
y_masks = subsequent_mask(idx).unsqueeze(0)
z, z_cache = self.decoder.forward_one_step(
ys, y_masks, hs, cache=z_cache) # (B, adim)
outs += [
self.feat_out(z).reshape([self.reduction_factor, self.odim])
] # [(r, odim), ...]
probs += [F.sigmoid(self.prob_out(z))[0]] # [(r), ...]
# update next inputs
ys = paddle.concat(
(ys, outs[-1][-1].reshape([1, 1, self.odim])),
axis=1) # (1, idx + 1, odim)
# get attention weights
att_ws_ = []
for name, m in self.named_sublayers():
if isinstance(m, MultiHeadedAttention) and "src" in name:
# [(#heads, 1, T),...]
att_ws_ += [m.attn[0, :, -1].unsqueeze(1)]
if idx == 1:
att_ws = att_ws_
else:
# [(#heads, l, T), ...]
att_ws = [
paddle.concat([att_w, att_w_], axis=1)
for att_w, att_w_ in zip(att_ws, att_ws_)
]
# check whether to finish generation
if sum(paddle.cast(probs[-1] >= threshold,
'int64')) > 0 or idx >= maxlen:
# check mininum length
if idx < minlen:
continue
# (L, odim) -> (1, L, odim) -> (1, odim, L)
outs = (paddle.concat(outs, axis=0).unsqueeze(0).transpose(
[0, 2, 1]))
if self.postnet is not None:
# (1, odim, L)
outs = outs + self.postnet(outs)
# (L, odim)
outs = outs.transpose([0, 2, 1]).squeeze(0)
probs = paddle.concat(probs, axis=0)
break
# concatenate attention weights -> (#layers, #heads, L, T)
att_ws = paddle.stack(att_ws, axis=0)
return outs, probs, att_ws
def _add_first_frame_and_remove_last_frame(
self, ys: paddle.Tensor) -> paddle.Tensor:
ys_in = paddle.concat(
[paddle.zeros((ys.shape[0], 1, ys.shape[2])), ys[:, :-1]], axis=1)
return ys_in
def _source_mask(self, ilens: paddle.Tensor) -> paddle.Tensor:
"""Make masks for self-attention.
Parameters
----------
ilens : Tensor
Batch of lengths (B,).
Returns
-------
Tensor
Mask tensor for self-attention.
dtype=paddle.bool
Examples
-------
>>> ilens = [5, 3]
>>> self._source_mask(ilens)
tensor([[[1, 1, 1, 1, 1],
[1, 1, 1, 0, 0]]]) bool
"""
x_masks = make_non_pad_mask(ilens)
return x_masks.unsqueeze(-2)
def _target_mask(self, olens: paddle.Tensor) -> paddle.Tensor:
"""Make masks for masked self-attention.
Parameters
----------
olens : LongTensor
Batch of lengths (B,).
Returns
----------
Tensor
Mask tensor for masked self-attention.
Examples
----------
>>> olens = [5, 3]
>>> self._target_mask(olens)
tensor([[[1, 0, 0, 0, 0],
[1, 1, 0, 0, 0],
[1, 1, 1, 0, 0],
[1, 1, 1, 1, 0],
[1, 1, 1, 1, 1]],
[[1, 0, 0, 0, 0],
[1, 1, 0, 0, 0],
[1, 1, 1, 0, 0],
[1, 1, 1, 0, 0],
[1, 1, 1, 0, 0]]], dtype=paddle.uint8)
"""
y_masks = make_non_pad_mask(olens)
s_masks = subsequent_mask(y_masks.shape[-1]).unsqueeze(0)
return paddle.logical_and(y_masks.unsqueeze(-2), s_masks)
def _integrate_with_spk_embed(self,
hs: paddle.Tensor,
spk_emb: paddle.Tensor) -> paddle.Tensor:
"""Integrate speaker embedding with hidden states.
Parameters
----------
hs : Tensor
Batch of hidden state sequences (B, Tmax, adim).
spk_emb : Tensor
Batch of speaker embeddings (B, spk_embed_dim).
Returns
----------
Tensor
Batch of integrated hidden state sequences (B, Tmax, adim).
"""
if self.spk_embed_integration_type == "add":
# apply projection and then add to hidden states
spk_emb = self.projection(F.normalize(spk_emb))
hs = hs + spk_emb.unsqueeze(1)
elif self.spk_embed_integration_type == "concat":
# concat hidden states with spk embeds and then apply projection
spk_emb = F.normalize(spk_emb).unsqueeze(1).expand(-1, hs.shape[1],
-1)
hs = self.projection(paddle.concat([hs, spk_emb], axis=-1))
else:
raise NotImplementedError("support only add or concat.")
return hs
class TransformerTTSInference(nn.Layer):
def __init__(self, normalizer, model):
super().__init__()
self.normalizer = normalizer
self.acoustic_model = model
def forward(self, text, spk_id=None):
normalized_mel = self.acoustic_model.inference(text)[0]
logmel = self.normalizer.inverse(normalized_mel)
return logmel
class TransformerTTSLoss(nn.Layer):
"""Loss function module for Tacotron2."""
def __init__(self,
use_masking=True,
use_weighted_masking=False,
bce_pos_weight=5.0):
"""Initialize Tactoron2 loss module.
Parameters
----------
use_masking : bool
Whether to apply masking for padded part in loss calculation.
use_weighted_masking : bool
Whether to apply weighted masking in loss calculation.
bce_pos_weight : float
Weight of positive sample of stop token.
"""
super().__init__()
assert (use_masking != use_weighted_masking) or not use_masking
self.use_masking = use_masking
self.use_weighted_masking = use_weighted_masking
# define criterions
reduction = "none" if self.use_weighted_masking else "mean"
self.l1_criterion = nn.L1Loss(reduction=reduction)
self.mse_criterion = nn.MSELoss(reduction=reduction)
self.bce_criterion = nn.BCEWithLogitsLoss(
reduction=reduction, pos_weight=paddle.to_tensor(bce_pos_weight))
def forward(self, after_outs, before_outs, logits, ys, labels, olens):
"""Calculate forward propagation.
Parameters
----------
after_outs : Tensor
Batch of outputs after postnets (B, Lmax, odim).
before_outs : Tensor
Batch of outputs before postnets (B, Lmax, odim).
logits : Tensor
Batch of stop logits (B, Lmax).
ys : Tensor
Batch of padded target features (B, Lmax, odim).
labels : LongTensor
Batch of the sequences of stop token labels (B, Lmax).
olens : LongTensor
Batch of the lengths of each target (B,).
Returns
----------
Tensor
L1 loss value.
Tensor
Mean square error loss value.
Tensor
Binary cross entropy loss value.
"""
# make mask and apply it
if self.use_masking:
masks = make_non_pad_mask(olens).unsqueeze(-1)
ys = ys.masked_select(masks.broadcast_to(ys.shape))
after_outs = after_outs.masked_select(
masks.broadcast_to(after_outs.shape))
before_outs = before_outs.masked_select(
masks.broadcast_to(before_outs.shape))
# Operator slice does not have kernel for data_type[bool]
tmp_masks = paddle.cast(masks, dtype='int64')
tmp_masks = tmp_masks[:, :, 0]
tmp_masks = paddle.cast(tmp_masks, dtype='bool')
labels = labels.masked_select(tmp_masks.broadcast_to(labels.shape))
logits = logits.masked_select(tmp_masks.broadcast_to(logits.shape))
# calculate loss
l1_loss = self.l1_criterion(after_outs, ys) + self.l1_criterion(
before_outs, ys)
mse_loss = self.mse_criterion(after_outs, ys) + self.mse_criterion(
before_outs, ys)
bce_loss = self.bce_criterion(logits, labels)
# make weighted mask and apply it
if self.use_weighted_masking:
masks = make_non_pad_mask(olens).unsqueeze(-1)
weights = masks.float() / masks.sum(dim=1, keepdim=True).float()
out_weights = weights.div(ys.shape[0] * ys.shape[2])
logit_weights = weights.div(ys.shape[0])
# apply weight
l1_loss = l1_loss.multiply(out_weights)
l1_loss = l1_loss.masked_select(
masks.broadcast_to(l1_loss.shape)).sum()
mse_loss = mse_loss.multiply(out_weights)
mse_loss = mse_loss.masked_select(
masks.broadcast_to(mse_loss.shape)).sum()
bce_loss = bce_loss.multiply(logit_weights.squeeze(-1))
bce_loss = bce_loss.masked_select(
masks.squeeze(-1).broadcast_to(bce_loss.shape)).sum()
return l1_loss, mse_loss, bce_loss
class GuidedAttentionLoss(nn.Layer):
"""Guided attention loss function module.
This module calculates the guided attention loss described
in `Efficiently Trainable Text-to-Speech System Based
on Deep Convolutional Networks with Guided Attention`_,
which forces the attention to be diagonal.
.. _`Efficiently Trainable Text-to-Speech System
Based on Deep Convolutional Networks with Guided Attention`:
https://arxiv.org/abs/1710.08969
"""
def __init__(self, sigma=0.4, alpha=1.0, reset_always=True):
"""Initialize guided attention loss module.
Parameters
----------
sigma : float, optional
Standard deviation to control how close attention to a diagonal.
alpha : float, optional
Scaling coefficient (lambda).
reset_always : bool, optional
Whether to always reset masks.
"""
super(GuidedAttentionLoss, self).__init__()
self.sigma = sigma
self.alpha = alpha
self.reset_always = reset_always
self.guided_attn_masks = None
self.masks = None
def _reset_masks(self):
self.guided_attn_masks = None
self.masks = None
def forward(self, att_ws, ilens, olens):
"""Calculate forward propagation.
Parameters
----------
att_ws : Tensor
Batch of attention weights (B, T_max_out, T_max_in).
ilens : LongTensor
Batch of input lenghts (B,).
olens : LongTensor
Batch of output lenghts (B,).
Returns
----------
Tensor
Guided attention loss value.
"""
if self.guided_attn_masks is None:
self.guided_attn_masks = self._make_guided_attention_masks(ilens,
olens)
if self.masks is None:
self.masks = self._make_masks(ilens, olens)
losses = self.guided_attn_masks * att_ws
loss = paddle.mean(
losses.masked_select(self.masks.broadcast_to(losses.shape)))
if self.reset_always:
self._reset_masks()
return self.alpha * loss
def _make_guided_attention_masks(self, ilens, olens):
n_batches = len(ilens)
max_ilen = max(ilens)
max_olen = max(olens)
guided_attn_masks = paddle.zeros((n_batches, max_olen, max_ilen))
for idx, (ilen, olen) in enumerate(zip(ilens, olens)):
ilen = int(ilen)
olen = int(olen)
guided_attn_masks[idx, :olen, :
ilen] = self._make_guided_attention_mask(
ilen, olen, self.sigma)
return guided_attn_masks
@staticmethod
def _make_guided_attention_mask(ilen, olen, sigma):
"""Make guided attention mask.
Examples
----------
>>> guided_attn_mask =_make_guided_attention(5, 5, 0.4)
>>> guided_attn_mask.shape
[5, 5]
>>> guided_attn_mask
tensor([[0.0000, 0.1175, 0.3935, 0.6753, 0.8647],
[0.1175, 0.0000, 0.1175, 0.3935, 0.6753],
[0.3935, 0.1175, 0.0000, 0.1175, 0.3935],
[0.6753, 0.3935, 0.1175, 0.0000, 0.1175],
[0.8647, 0.6753, 0.3935, 0.1175, 0.0000]])
>>> guided_attn_mask =_make_guided_attention(3, 6, 0.4)
>>> guided_attn_mask.shape
[6, 3]
>>> guided_attn_mask
tensor([[0.0000, 0.2934, 0.7506],
[0.0831, 0.0831, 0.5422],
[0.2934, 0.0000, 0.2934],
[0.5422, 0.0831, 0.0831],
[0.7506, 0.2934, 0.0000],
[0.8858, 0.5422, 0.0831]])
"""
grid_x, grid_y = paddle.meshgrid(
paddle.arange(olen), paddle.arange(ilen))
grid_x = grid_x.cast(dtype=paddle.float32)
grid_y = grid_y.cast(dtype=paddle.float32)
return 1.0 - paddle.exp(-(
(grid_y / ilen - grid_x / olen)**2) / (2 * (sigma**2)))
@staticmethod
def _make_masks(ilens, olens):
"""Make masks indicating non-padded part.
Parameters
----------
ilens (LongTensor or List): Batch of lengths (B,).
olens (LongTensor or List): Batch of lengths (B,).
Returns
----------
Tensor
Mask tensor indicating non-padded part.
Examples
----------
>>> ilens, olens = [5, 2], [8, 5]
>>> _make_mask(ilens, olens)
tensor([[[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1]],
[[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[1, 1, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]]], dtype=paddle.uint8)
"""
# (B, T_in)
in_masks = make_non_pad_mask(ilens)
# (B, T_out)
out_masks = make_non_pad_mask(olens)
# (B, T_out, T_in)
return paddle.logical_and(
out_masks.unsqueeze(-1), in_masks.unsqueeze(-2))
class GuidedMultiHeadAttentionLoss(GuidedAttentionLoss):
"""Guided attention loss function module for multi head attention.
Parameters
----------
sigma : float, optional
Standard deviation to controlGuidedAttentionLoss
how close attention to a diagonal.
alpha : float, optional
Scaling coefficient (lambda).
reset_always : bool, optional
Whether to always reset masks.
"""
def forward(self, att_ws, ilens, olens):
"""Calculate forward propagation.
Parameters
----------
att_ws : Tensor
Batch of multi head attention weights (B, H, T_max_out, T_max_in).
ilens : Tensor
Batch of input lenghts (B,).
olens : Tensor
Batch of output lenghts (B,).
Returns
----------
Tensor
Guided attention loss value.
"""
if self.guided_attn_masks is None:
self.guided_attn_masks = (
self._make_guided_attention_masks(ilens, olens).unsqueeze(1))
if self.masks is None:
self.masks = self._make_masks(ilens, olens).unsqueeze(1)
losses = self.guided_attn_masks * att_ws
loss = paddle.mean(
losses.masked_select(self.masks.broadcast_to(losses.shape)))
if self.reset_always:
self._reset_masks()
return self.alpha * loss
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