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import torch
import torch.nn as nn
import torch.nn.functional as F
class EncoderLayer(nn.Module):
def __init__(self, attention, d_model, d_ff=None, dropout=0.1, activation="relu"):
super(EncoderLayer, self).__init__()
d_ff = d_ff or 4 * d_model
self.attention = attention
self.conv1 = nn.Conv1d(in_channels=d_model, out_channels=d_ff, kernel_size=1)
self.conv2 = nn.Conv1d(in_channels=d_ff, out_channels=d_model, kernel_size=1)
self.norm1 = nn.LayerNorm(d_model)
self.norm2 = nn.LayerNorm(d_model)
self.dropout = nn.Dropout(dropout)
self.activation = F.relu if activation == "relu" else F.gelu
def forward(self, x, attn_mask=None, tau=None, delta=None):
new_x, attn = self.attention(x, x, x, attn_mask=attn_mask, tau=tau, delta=delta)
x = x + self.dropout(new_x)
y = x = self.norm1(x)
y = self.dropout(self.activation(self.conv1(y.transpose(-1, 1))))
y = self.dropout(self.conv2(y).transpose(-1, 1))
return self.norm2(x + y), attn
class Encoder(nn.Module):
def __init__(self, attn_layers, conv_layers=None, norm_layer=None):
super(Encoder, self).__init__()
self.attn_layers = nn.ModuleList(attn_layers)
self.conv_layers = (
nn.ModuleList(conv_layers) if conv_layers is not None else None
)
self.norm = norm_layer
def forward(self, x, attn_mask=None, tau=None, delta=None):
# x [B, L, D]
attns = []
if self.conv_layers is not None:
for i, (attn_layer, conv_layer) in enumerate(
zip(self.attn_layers, self.conv_layers)
):
delta = delta if i == 0 else None
x, attn = attn_layer(x, attn_mask=attn_mask, tau=tau, delta=delta)
x = conv_layer(x)
attns.append(attn)
x, attn = self.attn_layers[-1](x, tau=tau, delta=None)
attns.append(attn)
else:
for attn_layer in self.attn_layers:
x, attn = attn_layer(x, attn_mask=attn_mask, tau=tau, delta=delta)
attns.append(attn)
if self.norm is not None:
x = self.norm(x)
return x, attns
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