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| # Copyright 2020 Johns Hopkins University (Shinji Watanabe) | |
| # Northwestern Polytechnical University (Pengcheng Guo) | |
| # Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0) | |
| # Adapted by Florian Lux 2021 | |
| from torch import nn | |
| class ConvolutionModule(nn.Module): | |
| """ | |
| ConvolutionModule in Conformer model. | |
| Args: | |
| channels (int): The number of channels of conv layers. | |
| kernel_size (int): Kernel size of conv layers. | |
| """ | |
| def __init__(self, channels, kernel_size, activation=nn.ReLU(), bias=True): | |
| super(ConvolutionModule, self).__init__() | |
| # kernel_size should be an odd number for 'SAME' padding | |
| assert (kernel_size - 1) % 2 == 0 | |
| self.pointwise_conv1 = nn.Conv1d(channels, 2 * channels, kernel_size=1, stride=1, padding=0, bias=bias, ) | |
| self.depthwise_conv = nn.Conv1d(channels, channels, kernel_size, stride=1, padding=(kernel_size - 1) // 2, groups=channels, bias=bias, ) | |
| self.norm = nn.GroupNorm(num_groups=32, num_channels=channels) | |
| self.pointwise_conv2 = nn.Conv1d(channels, channels, kernel_size=1, stride=1, padding=0, bias=bias, ) | |
| self.activation = activation | |
| def forward(self, x): | |
| """ | |
| Compute convolution module. | |
| Args: | |
| x (torch.Tensor): Input tensor (#batch, time, channels). | |
| Returns: | |
| torch.Tensor: Output tensor (#batch, time, channels). | |
| """ | |
| # exchange the temporal dimension and the feature dimension | |
| x = x.transpose(1, 2) | |
| # GLU mechanism | |
| x = self.pointwise_conv1(x) # (batch, 2*channel, dim) | |
| x = nn.functional.glu(x, dim=1) # (batch, channel, dim) | |
| # 1D Depthwise Conv | |
| x = self.depthwise_conv(x) | |
| x = self.activation(self.norm(x)) | |
| x = self.pointwise_conv2(x) | |
| return x.transpose(1, 2) | |