530 lines
21 KiB
Python
530 lines
21 KiB
Python
from math import sqrt
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import torch
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from torch.autograd import Variable
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from torch import nn
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from torch.nn import functional as F
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from layers import ConvNorm, LinearNorm
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from utils import to_gpu, get_mask_from_lengths
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class LocationLayer(nn.Module):
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def __init__(self, attention_n_filters, attention_kernel_size,
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attention_dim):
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super(LocationLayer, self).__init__()
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padding = int((attention_kernel_size - 1) / 2)
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self.location_conv = ConvNorm(2, attention_n_filters,
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kernel_size=attention_kernel_size,
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padding=padding, bias=False, stride=1,
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dilation=1)
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self.location_dense = LinearNorm(attention_n_filters, attention_dim,
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bias=False, w_init_gain='tanh')
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def forward(self, attention_weights_cat):
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processed_attention = self.location_conv(attention_weights_cat)
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processed_attention = processed_attention.transpose(1, 2)
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processed_attention = self.location_dense(processed_attention)
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return processed_attention
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class Attention(nn.Module):
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def __init__(self, attention_rnn_dim, embedding_dim, attention_dim,
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attention_location_n_filters, attention_location_kernel_size):
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super(Attention, self).__init__()
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self.query_layer = LinearNorm(attention_rnn_dim, attention_dim,
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bias=False, w_init_gain='tanh')
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self.memory_layer = LinearNorm(embedding_dim, attention_dim, bias=False,
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w_init_gain='tanh')
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self.v = LinearNorm(attention_dim, 1, bias=False)
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self.location_layer = LocationLayer(attention_location_n_filters,
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attention_location_kernel_size,
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attention_dim)
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self.score_mask_value = -float("inf")
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def get_alignment_energies(self, query, processed_memory,
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attention_weights_cat):
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"""
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PARAMS
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------
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query: decoder output (batch, n_mel_channels * n_frames_per_step)
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processed_memory: processed encoder outputs (B, T_in, attention_dim)
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attention_weights_cat: cumulative and prev. att weights (B, 2, max_time)
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RETURNS
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-------
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alignment (batch, max_time)
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"""
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processed_query = self.query_layer(query.unsqueeze(1))
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processed_attention_weights = self.location_layer(attention_weights_cat)
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energies = self.v(torch.tanh(
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processed_query + processed_attention_weights + processed_memory))
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energies = energies.squeeze(-1)
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return energies
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def forward(self, attention_hidden_state, memory, processed_memory,
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attention_weights_cat, mask):
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"""
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PARAMS
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------
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attention_hidden_state: attention rnn last output
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memory: encoder outputs
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processed_memory: processed encoder outputs
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attention_weights_cat: previous and cummulative attention weights
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mask: binary mask for padded data
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"""
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alignment = self.get_alignment_energies(
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attention_hidden_state, processed_memory, attention_weights_cat)
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if mask is not None:
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alignment.data.masked_fill_(mask, self.score_mask_value)
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attention_weights = F.softmax(alignment, dim=1)
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attention_context = torch.bmm(attention_weights.unsqueeze(1), memory)
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attention_context = attention_context.squeeze(1)
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return attention_context, attention_weights
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class Prenet(nn.Module):
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def __init__(self, in_dim, sizes):
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super(Prenet, self).__init__()
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in_sizes = [in_dim] + sizes[:-1]
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self.layers = nn.ModuleList(
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[LinearNorm(in_size, out_size, bias=False)
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for (in_size, out_size) in zip(in_sizes, sizes)])
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def forward(self, x):
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for linear in self.layers:
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x = F.dropout(F.relu(linear(x)), p=0.5, training=True)
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return x
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class Postnet(nn.Module):
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"""Postnet
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- Five 1-d convolution with 512 channels and kernel size 5
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"""
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def __init__(self, hparams):
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super(Postnet, self).__init__()
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self.convolutions = nn.ModuleList()
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self.convolutions.append(
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nn.Sequential(
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ConvNorm(hparams.n_mel_channels, hparams.postnet_embedding_dim,
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kernel_size=hparams.postnet_kernel_size, stride=1,
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padding=int((hparams.postnet_kernel_size - 1) / 2),
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dilation=1, w_init_gain='tanh'),
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nn.BatchNorm1d(hparams.postnet_embedding_dim))
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)
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for i in range(1, hparams.postnet_n_convolutions - 1):
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self.convolutions.append(
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nn.Sequential(
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ConvNorm(hparams.postnet_embedding_dim,
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hparams.postnet_embedding_dim,
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kernel_size=hparams.postnet_kernel_size, stride=1,
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padding=int((hparams.postnet_kernel_size - 1) / 2),
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dilation=1, w_init_gain='tanh'),
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nn.BatchNorm1d(hparams.postnet_embedding_dim))
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)
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self.convolutions.append(
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nn.Sequential(
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ConvNorm(hparams.postnet_embedding_dim, hparams.n_mel_channels,
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kernel_size=hparams.postnet_kernel_size, stride=1,
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padding=int((hparams.postnet_kernel_size - 1) / 2),
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dilation=1, w_init_gain='linear'),
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nn.BatchNorm1d(hparams.n_mel_channels))
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)
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def forward(self, x):
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for i in range(len(self.convolutions) - 1):
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x = F.dropout(torch.tanh(self.convolutions[i](x)), 0.5, self.training)
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x = F.dropout(self.convolutions[-1](x), 0.5, self.training)
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return x
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class Encoder(nn.Module):
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"""Encoder module:
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- Three 1-d convolution banks
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- Bidirectional LSTM
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"""
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def __init__(self, hparams):
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super(Encoder, self).__init__()
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convolutions = []
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for _ in range(hparams.encoder_n_convolutions):
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conv_layer = nn.Sequential(
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ConvNorm(hparams.encoder_embedding_dim,
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hparams.encoder_embedding_dim,
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kernel_size=hparams.encoder_kernel_size, stride=1,
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padding=int((hparams.encoder_kernel_size - 1) / 2),
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dilation=1, w_init_gain='relu'),
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nn.BatchNorm1d(hparams.encoder_embedding_dim))
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convolutions.append(conv_layer)
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self.convolutions = nn.ModuleList(convolutions)
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self.lstm = nn.LSTM(hparams.encoder_embedding_dim,
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int(hparams.encoder_embedding_dim / 2), 1,
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batch_first=True, bidirectional=True)
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def forward(self, x, input_lengths):
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for conv in self.convolutions:
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x = F.dropout(F.relu(conv(x)), 0.5, self.training)
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x = x.transpose(1, 2)
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# pytorch tensor are not reversible, hence the conversion
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input_lengths = input_lengths.cpu().numpy()
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x = nn.utils.rnn.pack_padded_sequence(
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x, input_lengths, batch_first=True)
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self.lstm.flatten_parameters()
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outputs, _ = self.lstm(x)
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outputs, _ = nn.utils.rnn.pad_packed_sequence(
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outputs, batch_first=True)
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return outputs
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def inference(self, x):
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for conv in self.convolutions:
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x = F.dropout(F.relu(conv(x)), 0.5, self.training)
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x = x.transpose(1, 2)
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self.lstm.flatten_parameters()
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outputs, _ = self.lstm(x)
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return outputs
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class Decoder(nn.Module):
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def __init__(self, hparams):
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super(Decoder, self).__init__()
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self.n_mel_channels = hparams.n_mel_channels
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self.n_frames_per_step = hparams.n_frames_per_step
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self.encoder_embedding_dim = hparams.encoder_embedding_dim
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self.attention_rnn_dim = hparams.attention_rnn_dim
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self.decoder_rnn_dim = hparams.decoder_rnn_dim
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self.prenet_dim = hparams.prenet_dim
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self.max_decoder_steps = hparams.max_decoder_steps
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self.gate_threshold = hparams.gate_threshold
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self.p_attention_dropout = hparams.p_attention_dropout
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self.p_decoder_dropout = hparams.p_decoder_dropout
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self.prenet = Prenet(
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hparams.n_mel_channels * hparams.n_frames_per_step,
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[hparams.prenet_dim, hparams.prenet_dim])
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self.attention_rnn = nn.LSTMCell(
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hparams.prenet_dim + hparams.encoder_embedding_dim,
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hparams.attention_rnn_dim)
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self.attention_layer = Attention(
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hparams.attention_rnn_dim, hparams.encoder_embedding_dim,
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hparams.attention_dim, hparams.attention_location_n_filters,
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hparams.attention_location_kernel_size)
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self.decoder_rnn = nn.LSTMCell(
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hparams.attention_rnn_dim + hparams.encoder_embedding_dim,
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hparams.decoder_rnn_dim, 1)
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self.linear_projection = LinearNorm(
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hparams.decoder_rnn_dim + hparams.encoder_embedding_dim,
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hparams.n_mel_channels * hparams.n_frames_per_step)
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self.gate_layer = LinearNorm(
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hparams.decoder_rnn_dim + hparams.encoder_embedding_dim, 1,
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bias=True, w_init_gain='sigmoid')
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def get_go_frame(self, memory):
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""" Gets all zeros frames to use as first decoder input
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PARAMS
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------
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memory: decoder outputs
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RETURNS
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-------
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decoder_input: all zeros frames
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"""
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B = memory.size(0)
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decoder_input = Variable(memory.data.new(
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B, self.n_mel_channels * self.n_frames_per_step).zero_())
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return decoder_input
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def initialize_decoder_states(self, memory, mask):
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""" Initializes attention rnn states, decoder rnn states, attention
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weights, attention cumulative weights, attention context, stores memory
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and stores processed memory
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PARAMS
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------
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memory: Encoder outputs
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mask: Mask for padded data if training, expects None for inference
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"""
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B = memory.size(0)
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MAX_TIME = memory.size(1)
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self.attention_hidden = Variable(memory.data.new(
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B, self.attention_rnn_dim).zero_())
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self.attention_cell = Variable(memory.data.new(
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B, self.attention_rnn_dim).zero_())
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self.decoder_hidden = Variable(memory.data.new(
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B, self.decoder_rnn_dim).zero_())
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self.decoder_cell = Variable(memory.data.new(
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B, self.decoder_rnn_dim).zero_())
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self.attention_weights = Variable(memory.data.new(
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B, MAX_TIME).zero_())
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self.attention_weights_cum = Variable(memory.data.new(
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B, MAX_TIME).zero_())
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self.attention_context = Variable(memory.data.new(
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B, self.encoder_embedding_dim).zero_())
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self.memory = memory
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self.processed_memory = self.attention_layer.memory_layer(memory)
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self.mask = mask
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def parse_decoder_inputs(self, decoder_inputs):
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""" Prepares decoder inputs, i.e. mel outputs
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PARAMS
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------
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decoder_inputs: inputs used for teacher-forced training, i.e. mel-specs
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RETURNS
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-------
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inputs: processed decoder inputs
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"""
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# (B, n_mel_channels, T_out) -> (B, T_out, n_mel_channels)
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decoder_inputs = decoder_inputs.transpose(1, 2)
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decoder_inputs = decoder_inputs.view(
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decoder_inputs.size(0),
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int(decoder_inputs.size(1)/self.n_frames_per_step), -1)
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# (B, T_out, n_mel_channels) -> (T_out, B, n_mel_channels)
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decoder_inputs = decoder_inputs.transpose(0, 1)
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return decoder_inputs
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def parse_decoder_outputs(self, mel_outputs, gate_outputs, alignments):
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""" Prepares decoder outputs for output
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PARAMS
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------
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mel_outputs:
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gate_outputs: gate output energies
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alignments:
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RETURNS
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-------
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mel_outputs:
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gate_outpust: gate output energies
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alignments:
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"""
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# (T_out, B) -> (B, T_out)
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alignments = torch.stack(alignments).transpose(0, 1)
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# (T_out, B) -> (B, T_out)
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gate_outputs = torch.stack(gate_outputs).transpose(0, 1)
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gate_outputs = gate_outputs.contiguous()
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# (T_out, B, n_mel_channels) -> (B, T_out, n_mel_channels)
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mel_outputs = torch.stack(mel_outputs).transpose(0, 1).contiguous()
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# decouple frames per step
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mel_outputs = mel_outputs.view(
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mel_outputs.size(0), -1, self.n_mel_channels)
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# (B, T_out, n_mel_channels) -> (B, n_mel_channels, T_out)
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mel_outputs = mel_outputs.transpose(1, 2)
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return mel_outputs, gate_outputs, alignments
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def decode(self, decoder_input):
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""" Decoder step using stored states, attention and memory
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PARAMS
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------
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decoder_input: previous mel output
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RETURNS
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-------
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mel_output:
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gate_output: gate output energies
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attention_weights:
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"""
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cell_input = torch.cat((decoder_input, self.attention_context), -1)
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self.attention_hidden, self.attention_cell = self.attention_rnn(
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cell_input, (self.attention_hidden, self.attention_cell))
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self.attention_hidden = F.dropout(
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self.attention_hidden, self.p_attention_dropout, self.training)
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attention_weights_cat = torch.cat(
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(self.attention_weights.unsqueeze(1),
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self.attention_weights_cum.unsqueeze(1)), dim=1)
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self.attention_context, self.attention_weights = self.attention_layer(
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self.attention_hidden, self.memory, self.processed_memory,
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attention_weights_cat, self.mask)
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self.attention_weights_cum += self.attention_weights
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decoder_input = torch.cat(
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(self.attention_hidden, self.attention_context), -1)
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self.decoder_hidden, self.decoder_cell = self.decoder_rnn(
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decoder_input, (self.decoder_hidden, self.decoder_cell))
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self.decoder_hidden = F.dropout(
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self.decoder_hidden, self.p_decoder_dropout, self.training)
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decoder_hidden_attention_context = torch.cat(
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(self.decoder_hidden, self.attention_context), dim=1)
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decoder_output = self.linear_projection(
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decoder_hidden_attention_context)
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gate_prediction = self.gate_layer(decoder_hidden_attention_context)
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return decoder_output, gate_prediction, self.attention_weights
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def forward(self, memory, decoder_inputs, memory_lengths):
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""" Decoder forward pass for training
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PARAMS
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------
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memory: Encoder outputs
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decoder_inputs: Decoder inputs for teacher forcing. i.e. mel-specs
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memory_lengths: Encoder output lengths for attention masking.
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RETURNS
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-------
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mel_outputs: mel outputs from the decoder
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gate_outputs: gate outputs from the decoder
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alignments: sequence of attention weights from the decoder
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"""
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decoder_input = self.get_go_frame(memory).unsqueeze(0)
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decoder_inputs = self.parse_decoder_inputs(decoder_inputs)
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decoder_inputs = torch.cat((decoder_input, decoder_inputs), dim=0)
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decoder_inputs = self.prenet(decoder_inputs)
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self.initialize_decoder_states(
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memory, mask=~get_mask_from_lengths(memory_lengths))
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mel_outputs, gate_outputs, alignments = [], [], []
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while len(mel_outputs) < decoder_inputs.size(0) - 1:
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decoder_input = decoder_inputs[len(mel_outputs)]
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mel_output, gate_output, attention_weights = self.decode(
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decoder_input)
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mel_outputs += [mel_output.squeeze(1)]
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gate_outputs += [gate_output.squeeze(1)]
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alignments += [attention_weights]
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mel_outputs, gate_outputs, alignments = self.parse_decoder_outputs(
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mel_outputs, gate_outputs, alignments)
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return mel_outputs, gate_outputs, alignments
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def inference(self, memory):
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""" Decoder inference
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PARAMS
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------
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memory: Encoder outputs
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RETURNS
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-------
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mel_outputs: mel outputs from the decoder
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gate_outputs: gate outputs from the decoder
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alignments: sequence of attention weights from the decoder
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"""
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decoder_input = self.get_go_frame(memory)
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self.initialize_decoder_states(memory, mask=None)
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mel_outputs, gate_outputs, alignments = [], [], []
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while True:
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decoder_input = self.prenet(decoder_input)
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mel_output, gate_output, alignment = self.decode(decoder_input)
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mel_outputs += [mel_output.squeeze(1)]
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gate_outputs += [gate_output]
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alignments += [alignment]
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if torch.sigmoid(gate_output.data) > self.gate_threshold:
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break
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elif len(mel_outputs) == self.max_decoder_steps:
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print("Warning! Reached max decoder steps")
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break
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decoder_input = mel_output
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mel_outputs, gate_outputs, alignments = self.parse_decoder_outputs(
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mel_outputs, gate_outputs, alignments)
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return mel_outputs, gate_outputs, alignments
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class Tacotron2(nn.Module):
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def __init__(self, hparams):
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super(Tacotron2, self).__init__()
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self.mask_padding = hparams.mask_padding
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self.fp16_run = hparams.fp16_run
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self.n_mel_channels = hparams.n_mel_channels
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self.n_frames_per_step = hparams.n_frames_per_step
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self.embedding = nn.Embedding(
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hparams.n_symbols, hparams.symbols_embedding_dim)
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std = sqrt(2.0 / (hparams.n_symbols + hparams.symbols_embedding_dim))
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val = sqrt(3.0) * std # uniform bounds for std
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self.embedding.weight.data.uniform_(-val, val)
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self.encoder = Encoder(hparams)
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self.decoder = Decoder(hparams)
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self.postnet = Postnet(hparams)
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def parse_batch(self, batch):
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text_padded, input_lengths, mel_padded, gate_padded, \
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output_lengths = batch
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text_padded = to_gpu(text_padded).long()
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input_lengths = to_gpu(input_lengths).long()
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max_len = torch.max(input_lengths.data).item()
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mel_padded = to_gpu(mel_padded).float()
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|
gate_padded = to_gpu(gate_padded).float()
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|
output_lengths = to_gpu(output_lengths).long()
|
|
|
|
return (
|
|
(text_padded, input_lengths, mel_padded, max_len, output_lengths),
|
|
(mel_padded, gate_padded))
|
|
|
|
def parse_output(self, outputs, output_lengths=None):
|
|
if self.mask_padding and output_lengths is not None:
|
|
mask = ~get_mask_from_lengths(output_lengths)
|
|
mask = mask.expand(self.n_mel_channels, mask.size(0), mask.size(1))
|
|
mask = mask.permute(1, 0, 2)
|
|
|
|
outputs[0].data.masked_fill_(mask, 0.0)
|
|
outputs[1].data.masked_fill_(mask, 0.0)
|
|
outputs[2].data.masked_fill_(mask[:, 0, :], 1e3) # gate energies
|
|
|
|
return outputs
|
|
|
|
def forward(self, inputs):
|
|
text_inputs, text_lengths, mels, max_len, output_lengths = inputs
|
|
text_lengths, output_lengths = text_lengths.data, output_lengths.data
|
|
|
|
embedded_inputs = self.embedding(text_inputs).transpose(1, 2)
|
|
|
|
encoder_outputs = self.encoder(embedded_inputs, text_lengths)
|
|
|
|
mel_outputs, gate_outputs, alignments = self.decoder(
|
|
encoder_outputs, mels, memory_lengths=text_lengths)
|
|
|
|
mel_outputs_postnet = self.postnet(mel_outputs)
|
|
mel_outputs_postnet = mel_outputs + mel_outputs_postnet
|
|
|
|
return self.parse_output(
|
|
[mel_outputs, mel_outputs_postnet, gate_outputs, alignments],
|
|
output_lengths)
|
|
|
|
def inference(self, inputs):
|
|
embedded_inputs = self.embedding(inputs).transpose(1, 2)
|
|
encoder_outputs = self.encoder.inference(embedded_inputs)
|
|
mel_outputs, gate_outputs, alignments = self.decoder.inference(
|
|
encoder_outputs)
|
|
|
|
mel_outputs_postnet = self.postnet(mel_outputs)
|
|
mel_outputs_postnet = mel_outputs + mel_outputs_postnet
|
|
|
|
outputs = self.parse_output(
|
|
[mel_outputs, mel_outputs_postnet, gate_outputs, alignments])
|
|
|
|
return outputs
|