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314 lines
11 KiB
314 lines
11 KiB
# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Modified from espnet(https://github.com/espnet/espnet)
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"""Style encoder of GST-Tacotron."""
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from typing import Sequence
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import paddle
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from paddle import nn
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from typeguard import check_argument_types
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from paddlespeech.t2s.modules.transformer.attention import MultiHeadedAttention as BaseMultiHeadedAttention
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class StyleEncoder(nn.Layer):
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"""Style encoder.
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This module is style encoder introduced in `Style Tokens: Unsupervised Style
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Modeling, Control and Transfer in End-to-End Speech Synthesis`.
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.. _`Style Tokens: Unsupervised Style Modeling, Control and Transfer in End-to-End
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Speech Synthesis`: https://arxiv.org/abs/1803.09017
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Parameters
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----------
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idim : int, optional
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Dimension of the input mel-spectrogram.
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gst_tokens : int, optional
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The number of GST embeddings.
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gst_token_dim : int, optional
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Dimension of each GST embedding.
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gst_heads : int, optional
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The number of heads in GST multihead attention.
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conv_layers : int, optional
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The number of conv layers in the reference encoder.
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conv_chans_list : Sequence[int], optional
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List of the number of channels of conv layers in the referece encoder.
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conv_kernel_size : int, optional
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Kernal size of conv layers in the reference encoder.
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conv_stride : int, optional
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Stride size of conv layers in the reference encoder.
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gru_layers : int, optional
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The number of GRU layers in the reference encoder.
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gru_units : int, optional
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The number of GRU units in the reference encoder.
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Todo
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----------
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* Support manual weight specification in inference.
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"""
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def __init__(
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self,
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idim: int=80,
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gst_tokens: int=10,
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gst_token_dim: int=256,
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gst_heads: int=4,
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conv_layers: int=6,
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conv_chans_list: Sequence[int]=(32, 32, 64, 64, 128, 128),
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conv_kernel_size: int=3,
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conv_stride: int=2,
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gru_layers: int=1,
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gru_units: int=128, ):
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"""Initilize global style encoder module."""
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assert check_argument_types()
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super().__init__()
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self.ref_enc = ReferenceEncoder(
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idim=idim,
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conv_layers=conv_layers,
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conv_chans_list=conv_chans_list,
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conv_kernel_size=conv_kernel_size,
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conv_stride=conv_stride,
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gru_layers=gru_layers,
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gru_units=gru_units, )
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self.stl = StyleTokenLayer(
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ref_embed_dim=gru_units,
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gst_tokens=gst_tokens,
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gst_token_dim=gst_token_dim,
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gst_heads=gst_heads, )
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def forward(self, speech: paddle.Tensor) -> paddle.Tensor:
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"""Calculate forward propagation.
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Parameters
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----------
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speech : Tensor
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Batch of padded target features (B, Lmax, odim).
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Returns
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----------
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Tensor:
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Style token embeddings (B, token_dim).
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"""
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ref_embs = self.ref_enc(speech)
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style_embs = self.stl(ref_embs)
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return style_embs
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class ReferenceEncoder(nn.Layer):
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"""Reference encoder module.
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This module is refernece encoder introduced in `Style Tokens: Unsupervised Style
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Modeling, Control and Transfer in End-to-End Speech Synthesis`.
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.. _`Style Tokens: Unsupervised Style Modeling, Control and Transfer in End-to-End
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Speech Synthesis`: https://arxiv.org/abs/1803.09017
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Parameters
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----------
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idim : int, optional
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Dimension of the input mel-spectrogram.
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conv_layers : int, optional
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The number of conv layers in the reference encoder.
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conv_chans_list: : Sequence[int], optional
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List of the number of channels of conv layers in the referece encoder.
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conv_kernel_size : int, optional
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Kernal size of conv layers in the reference encoder.
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conv_stride : int, optional
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Stride size of conv layers in the reference encoder.
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gru_layers : int, optional
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The number of GRU layers in the reference encoder.
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gru_units : int, optional
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The number of GRU units in the reference encoder.
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"""
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def __init__(
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self,
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idim=80,
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conv_layers: int=6,
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conv_chans_list: Sequence[int]=(32, 32, 64, 64, 128, 128),
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conv_kernel_size: int=3,
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conv_stride: int=2,
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gru_layers: int=1,
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gru_units: int=128, ):
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"""Initilize reference encoder module."""
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assert check_argument_types()
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super().__init__()
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# check hyperparameters are valid
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assert conv_kernel_size % 2 == 1, "kernel size must be odd."
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assert (
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len(conv_chans_list) == conv_layers
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), "the number of conv layers and length of channels list must be the same."
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convs = []
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padding = (conv_kernel_size - 1) // 2
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for i in range(conv_layers):
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conv_in_chans = 1 if i == 0 else conv_chans_list[i - 1]
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conv_out_chans = conv_chans_list[i]
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convs += [
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nn.Conv2D(
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conv_in_chans,
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conv_out_chans,
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kernel_size=conv_kernel_size,
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stride=conv_stride,
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padding=padding,
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# Do not use bias due to the following batch norm
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bias_attr=False, ),
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nn.BatchNorm2D(conv_out_chans),
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nn.ReLU(),
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]
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self.convs = nn.Sequential(*convs)
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self.conv_layers = conv_layers
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self.kernel_size = conv_kernel_size
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self.stride = conv_stride
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self.padding = padding
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# get the number of GRU input units
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gru_in_units = idim
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for i in range(conv_layers):
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gru_in_units = (gru_in_units - conv_kernel_size + 2 * padding
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) // conv_stride + 1
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gru_in_units *= conv_out_chans
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self.gru = nn.GRU(gru_in_units, gru_units, gru_layers, time_major=False)
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def forward(self, speech: paddle.Tensor) -> paddle.Tensor:
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"""Calculate forward propagation.
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Parameters
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----------
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speech : Tensor
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Batch of padded target features (B, Lmax, idim).
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Return
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----------
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Tensor
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Reference embedding (B, gru_units)
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"""
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batch_size = speech.shape[0]
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# (B, 1, Lmax, idim)
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xs = speech.unsqueeze(1)
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# (B, Lmax', conv_out_chans, idim')
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hs = self.convs(xs).transpose([0, 2, 1, 3])
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time_length = hs.shape[1]
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# (B, Lmax', gru_units)
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hs = hs.reshape(shape=[batch_size, time_length, -1])
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self.gru.flatten_parameters()
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# (gru_layers, batch_size, gru_units)
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_, ref_embs = self.gru(hs)
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# (batch_size, gru_units)
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ref_embs = ref_embs[-1]
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return ref_embs
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class StyleTokenLayer(nn.Layer):
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"""Style token layer module.
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This module is style token layer introduced in `Style Tokens: Unsupervised Style
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Modeling, Control and Transfer in End-to-End Speech Synthesis`.
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.. _`Style Tokens: Unsupervised Style Modeling, Control and Transfer in End-to-End
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Speech Synthesis`: https://arxiv.org/abs/1803.09017
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Parameters
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----------
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ref_embed_dim : int, optional
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Dimension of the input reference embedding.
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gst_tokens : int, optional
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The number of GST embeddings.
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gst_token_dim : int, optional
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Dimension of each GST embedding.
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gst_heads : int, optional
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The number of heads in GST multihead attention.
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dropout_rate : float, optional
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Dropout rate in multi-head attention.
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"""
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def __init__(
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self,
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ref_embed_dim: int=128,
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gst_tokens: int=10,
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gst_token_dim: int=256,
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gst_heads: int=4,
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dropout_rate: float=0.0, ):
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"""Initilize style token layer module."""
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assert check_argument_types()
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super().__init__()
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gst_embs = paddle.randn(shape=[gst_tokens, gst_token_dim // gst_heads])
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self.gst_embs = paddle.create_parameter(
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shape=gst_embs.shape,
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dtype=str(gst_embs.numpy().dtype),
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default_initializer=paddle.nn.initializer.Assign(gst_embs))
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self.mha = MultiHeadedAttention(
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q_dim=ref_embed_dim,
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k_dim=gst_token_dim // gst_heads,
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v_dim=gst_token_dim // gst_heads,
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n_head=gst_heads,
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n_feat=gst_token_dim,
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dropout_rate=dropout_rate, )
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def forward(self, ref_embs: paddle.Tensor) -> paddle.Tensor:
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"""Calculate forward propagation.
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Parameters
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----------
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ref_embs : Tensor
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Reference embeddings (B, ref_embed_dim).
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Returns
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----------
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Tensor
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Style token embeddings (B, gst_token_dim).
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"""
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batch_size = ref_embs.shape[0]
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# (num_tokens, token_dim) -> (batch_size, num_tokens, token_dim)
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gst_embs = paddle.tanh(self.gst_embs).unsqueeze(0).expand(
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[batch_size, -1, -1])
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# (batch_size, 1 ,ref_embed_dim)
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ref_embs = ref_embs.unsqueeze(1)
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style_embs = self.mha(ref_embs, gst_embs, gst_embs, None)
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return style_embs.squeeze(1)
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class MultiHeadedAttention(BaseMultiHeadedAttention):
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"""Multi head attention module with different input dimension."""
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def __init__(self, q_dim, k_dim, v_dim, n_head, n_feat, dropout_rate=0.0):
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"""Initialize multi head attention module."""
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# NOTE(kan-bayashi): Do not use super().__init__() here since we want to
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# overwrite BaseMultiHeadedAttention.__init__() method.
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nn.Layer.__init__(self)
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assert n_feat % n_head == 0
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# We assume d_v always equals d_k
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self.d_k = n_feat // n_head
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self.h = n_head
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self.linear_q = nn.Linear(q_dim, n_feat)
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self.linear_k = nn.Linear(k_dim, n_feat)
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self.linear_v = nn.Linear(v_dim, n_feat)
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self.linear_out = nn.Linear(n_feat, n_feat)
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self.attn = None
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self.dropout = nn.Dropout(p=dropout_rate)
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