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PaddleSpeech/paddlespeech/t2s/modules/tacotron2/encoder.py

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6.6 KiB

# 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)
"""Tacotron2 encoder related modules."""
import paddle
import six
from paddle import nn
class Encoder(nn.Layer):
"""Encoder module of Spectrogram prediction network.
This is a module of encoder of Spectrogram prediction network in Tacotron2,
which described in `Natural TTS Synthesis by Conditioning WaveNet on Mel
Spectrogram Predictions`_. This is the encoder which converts either a sequence
of characters or acoustic features into the sequence of hidden states.
.. _`Natural TTS Synthesis by Conditioning WaveNet on Mel Spectrogram Predictions`:
https://arxiv.org/abs/1712.05884
"""
def __init__(
self,
idim,
input_layer="embed",
embed_dim=512,
elayers=1,
eunits=512,
econv_layers=3,
econv_chans=512,
econv_filts=5,
use_batch_norm=True,
use_residual=False,
dropout_rate=0.5,
padding_idx=0, ):
"""Initialize Tacotron2 encoder module.
Parameters
----------
idim : int
Dimension of the inputs.
input_layer : str
Input layer type.
embed_dim : int, optional
Dimension of character embedding.
elayers : int, optional
The number of encoder blstm layers.
eunits : int, optional
The number of encoder blstm units.
econv_layers : int, optional
The number of encoder conv layers.
econv_filts : int, optional
The number of encoder conv filter size.
econv_chans : int, optional
The number of encoder conv filter channels.
use_batch_norm : bool, optional
Whether to use batch normalization.
use_residual : bool, optional
Whether to use residual connection.
dropout_rate : float, optional
Dropout rate.
"""
super().__init__()
# store the hyperparameters
self.idim = idim
self.use_residual = use_residual
# define network layer modules
if input_layer == "linear":
self.embed = nn.Linear(idim, econv_chans)
elif input_layer == "embed":
self.embed = nn.Embedding(idim, embed_dim, padding_idx=padding_idx)
else:
raise ValueError("unknown input_layer: " + input_layer)
if econv_layers > 0:
self.convs = nn.LayerList()
for layer in six.moves.range(econv_layers):
ichans = (embed_dim if layer == 0 and input_layer == "embed"
else econv_chans)
if use_batch_norm:
self.convs.append(
nn.Sequential(
nn.Conv1D(
ichans,
econv_chans,
econv_filts,
stride=1,
padding=(econv_filts - 1) // 2,
bias_attr=False, ),
nn.BatchNorm1D(econv_chans),
nn.ReLU(),
nn.Dropout(dropout_rate), ))
else:
self.convs += [
nn.Sequential(
nn.Conv1D(
ichans,
econv_chans,
econv_filts,
stride=1,
padding=(econv_filts - 1) // 2,
bias_attr=False, ),
nn.ReLU(),
nn.Dropout(dropout_rate), )
]
else:
self.convs = None
if elayers > 0:
iunits = econv_chans if econv_layers != 0 else embed_dim
# batch_first=True, bidirectional=True
self.blstm = nn.LSTM(
iunits,
eunits // 2,
elayers,
time_major=False,
direction='bidirectional',
bias_ih_attr=True,
bias_hh_attr=True)
else:
self.blstm = None
# # initialize
# self.apply(encoder_init)
def forward(self, xs, ilens=None):
"""Calculate forward propagation.
Parameters
----------
xs : Tensor
Batch of the padded sequence. Either character ids (B, Tmax)
or acoustic feature (B, Tmax, idim * encoder_reduction_factor).
Padded value should be 0.
ilens : LongTensor
Batch of lengths of each input batch (B,).
Returns
----------
Tensor
Batch of the sequences of encoder states(B, Tmax, eunits).
LongTensor
Batch of lengths of each sequence (B,)
"""
xs = self.embed(xs).transpose([0, 2, 1])
if self.convs is not None:
for i in six.moves.range(len(self.convs)):
if self.use_residual:
xs += self.convs[i](xs)
else:
xs = self.convs[i](xs)
if self.blstm is None:
return xs.transpose([0, 2, 1])
if not isinstance(ilens, paddle.Tensor):
ilens = paddle.to_tensor(ilens)
xs = xs.transpose([0, 2, 1])
self.blstm.flatten_parameters()
# (B, Tmax, C)
xs, _ = self.blstm(xs)
# hlens 是什么
hlens = ilens
return xs, hlens
def inference(self, x):
"""Inference.
Parameters
----------
x : Tensor
The sequeunce of character ids (T,)
or acoustic feature (T, idim * encoder_reduction_factor).
Returns
----------
Tensor
The sequences of encoder states(T, eunits).
"""
xs = x.unsqueeze(0)
ilens = paddle.to_tensor([x.shape[0]])
return self.forward(xs, ilens)[0][0]