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| # Copyright (c) 2023 Amphion. | |
| # | |
| # This source code is licensed under the MIT license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| import numpy as np | |
| import torch | |
| import torch.nn as nn | |
| import math | |
| from torch.nn import functional as F | |
| class StyleAdaptiveLayerNorm(nn.Module): | |
| def __init__(self, normalized_shape, eps=1e-5): | |
| super().__init__() | |
| self.in_dim = normalized_shape | |
| self.norm = nn.LayerNorm(self.in_dim, eps=eps, elementwise_affine=False) | |
| self.style = nn.Linear(self.in_dim, self.in_dim * 2) | |
| self.style.bias.data[: self.in_dim] = 1 | |
| self.style.bias.data[self.in_dim :] = 0 | |
| def forward(self, x, condition): | |
| # x: (B, T, d); condition: (B, T, d) | |
| style = self.style(torch.mean(condition, dim=1, keepdim=True)) | |
| gamma, beta = style.chunk(2, -1) | |
| out = self.norm(x) | |
| out = gamma * out + beta | |
| return out | |
| class PositionalEncoding(nn.Module): | |
| def __init__(self, d_model, dropout, max_len=5000): | |
| super().__init__() | |
| self.dropout = dropout | |
| position = torch.arange(max_len).unsqueeze(1) | |
| div_term = torch.exp( | |
| torch.arange(0, d_model, 2) * (-math.log(10000.0) / d_model) | |
| ) | |
| pe = torch.zeros(max_len, 1, d_model) | |
| pe[:, 0, 0::2] = torch.sin(position * div_term) | |
| pe[:, 0, 1::2] = torch.cos(position * div_term) | |
| self.register_buffer("pe", pe) | |
| def forward(self, x): | |
| x = x + self.pe[: x.size(0)] | |
| return F.dropout(x, self.dropout, training=self.training) | |
| class TransformerFFNLayer(nn.Module): | |
| def __init__( | |
| self, encoder_hidden, conv_filter_size, conv_kernel_size, encoder_dropout | |
| ): | |
| super().__init__() | |
| self.encoder_hidden = encoder_hidden | |
| self.conv_filter_size = conv_filter_size | |
| self.conv_kernel_size = conv_kernel_size | |
| self.encoder_dropout = encoder_dropout | |
| self.ffn_1 = nn.Conv1d( | |
| self.encoder_hidden, | |
| self.conv_filter_size, | |
| self.conv_kernel_size, | |
| padding=self.conv_kernel_size // 2, | |
| ) | |
| self.ffn_1.weight.data.normal_(0.0, 0.02) | |
| self.ffn_2 = nn.Linear(self.conv_filter_size, self.encoder_hidden) | |
| self.ffn_2.weight.data.normal_(0.0, 0.02) | |
| def forward(self, x): | |
| # x: (B, T, d) | |
| x = self.ffn_1(x.permute(0, 2, 1)).permute( | |
| 0, 2, 1 | |
| ) # (B, T, d) -> (B, d, T) -> (B, T, d) | |
| x = F.relu(x) | |
| x = F.dropout(x, self.encoder_dropout, training=self.training) | |
| x = self.ffn_2(x) | |
| return x | |
| class TransformerEncoderLayer(nn.Module): | |
| def __init__( | |
| self, | |
| encoder_hidden, | |
| encoder_head, | |
| conv_filter_size, | |
| conv_kernel_size, | |
| encoder_dropout, | |
| use_cln, | |
| ): | |
| super().__init__() | |
| self.encoder_hidden = encoder_hidden | |
| self.encoder_head = encoder_head | |
| self.conv_filter_size = conv_filter_size | |
| self.conv_kernel_size = conv_kernel_size | |
| self.encoder_dropout = encoder_dropout | |
| self.use_cln = use_cln | |
| if not self.use_cln: | |
| self.ln_1 = nn.LayerNorm(self.encoder_hidden) | |
| self.ln_2 = nn.LayerNorm(self.encoder_hidden) | |
| else: | |
| self.ln_1 = StyleAdaptiveLayerNorm(self.encoder_hidden) | |
| self.ln_2 = StyleAdaptiveLayerNorm(self.encoder_hidden) | |
| self.self_attn = nn.MultiheadAttention( | |
| self.encoder_hidden, self.encoder_head, batch_first=True | |
| ) | |
| self.ffn = TransformerFFNLayer( | |
| self.encoder_hidden, | |
| self.conv_filter_size, | |
| self.conv_kernel_size, | |
| self.encoder_dropout, | |
| ) | |
| def forward(self, x, key_padding_mask, conditon=None): | |
| # x: (B, T, d); key_padding_mask: (B, T), mask is 0; condition: (B, T, d) | |
| # self attention | |
| residual = x | |
| if self.use_cln: | |
| x = self.ln_1(x, conditon) | |
| else: | |
| x = self.ln_1(x) | |
| if key_padding_mask != None: | |
| key_padding_mask_input = ~(key_padding_mask.bool()) | |
| else: | |
| key_padding_mask_input = None | |
| x, _ = self.self_attn( | |
| query=x, key=x, value=x, key_padding_mask=key_padding_mask_input | |
| ) | |
| x = F.dropout(x, self.encoder_dropout, training=self.training) | |
| x = residual + x | |
| # ffn | |
| residual = x | |
| if self.use_cln: | |
| x = self.ln_2(x, conditon) | |
| else: | |
| x = self.ln_2(x) | |
| x = self.ffn(x) | |
| x = residual + x | |
| return x | |
| class TransformerEncoder(nn.Module): | |
| def __init__( | |
| self, | |
| enc_emb_tokens=None, | |
| encoder_layer=4, | |
| encoder_hidden=256, | |
| encoder_head=4, | |
| conv_filter_size=1024, | |
| conv_kernel_size=5, | |
| encoder_dropout=0.1, | |
| use_cln=False, | |
| cfg=None, | |
| ): | |
| super().__init__() | |
| self.encoder_layer = ( | |
| encoder_layer if encoder_layer is not None else cfg.encoder_layer | |
| ) | |
| self.encoder_hidden = ( | |
| encoder_hidden if encoder_hidden is not None else cfg.encoder_hidden | |
| ) | |
| self.encoder_head = ( | |
| encoder_head if encoder_head is not None else cfg.encoder_head | |
| ) | |
| self.conv_filter_size = ( | |
| conv_filter_size if conv_filter_size is not None else cfg.conv_filter_size | |
| ) | |
| self.conv_kernel_size = ( | |
| conv_kernel_size if conv_kernel_size is not None else cfg.conv_kernel_size | |
| ) | |
| self.encoder_dropout = ( | |
| encoder_dropout if encoder_dropout is not None else cfg.encoder_dropout | |
| ) | |
| self.use_cln = use_cln if use_cln is not None else cfg.use_cln | |
| if enc_emb_tokens != None: | |
| self.use_enc_emb = True | |
| self.enc_emb_tokens = enc_emb_tokens | |
| else: | |
| self.use_enc_emb = False | |
| self.position_emb = PositionalEncoding( | |
| self.encoder_hidden, self.encoder_dropout | |
| ) | |
| self.layers = nn.ModuleList([]) | |
| self.layers.extend( | |
| [ | |
| TransformerEncoderLayer( | |
| self.encoder_hidden, | |
| self.encoder_head, | |
| self.conv_filter_size, | |
| self.conv_kernel_size, | |
| self.encoder_dropout, | |
| self.use_cln, | |
| ) | |
| for i in range(self.encoder_layer) | |
| ] | |
| ) | |
| if self.use_cln: | |
| self.last_ln = StyleAdaptiveLayerNorm(self.encoder_hidden) | |
| else: | |
| self.last_ln = nn.LayerNorm(self.encoder_hidden) | |
| def forward(self, x, key_padding_mask, condition=None): | |
| if len(x.shape) == 2 and self.use_enc_emb: | |
| x = self.enc_emb_tokens(x) | |
| x = self.position_emb(x) | |
| else: | |
| x = self.position_emb(x) # (B, T, d) | |
| for layer in self.layers: | |
| x = layer(x, key_padding_mask, condition) | |
| if self.use_cln: | |
| x = self.last_ln(x, condition) | |
| else: | |
| x = self.last_ln(x) | |
| return x | |