这段代码怎么拆分成单独的层class resnet50_Decoder(nn.Module): def __init__(self, inplanes, bn_momentum=0.1): super(resnet50_Decoder, self).__init__() self.bn_momentum = bn_momentum self.inplanes = inplanes self.deconv_with_bias = False #----------------------------------------------------------# # 16,16,2048 -> 32,32,256 -> 64,64,128 -> 128,128,64 # 利用ConvTranspose2d进行上采样。 # 每次特征层的宽高变为原来的两倍。 #----------------------------------------------------------# self.deconv_layers = self._make_deconv_layer( num_layers=3, num_filters=[256, 128, 64], num_kernels=[4, 4, 4], ) def _make_deconv_layer(self, num_layers, num_filters, num_kernels): layers = [] for i in range(num_layers): kernel = num_kernels[i] planes = num_filters[i] layers.append( nn.ConvTranspose2d( in_channels=self.inplanes, out_channels=planes, kernel_size=kernel, stride=2, padding=1, output_padding=0, bias=self.deconv_with_bias)) layers.append(nn.BatchNorm2d(planes, momentum=self.bn_momentum)) layers.append(nn.ReLU(inplace=True)) self.inplanes = planes return nn.Sequential(*layers) def forward(self, x): return self.deconv_layers(x)

可以将这段代码拆分成以下两个类：

1. DeconvLayer(nn.Module)：此类用于实现ConvTranspose2d、BatchNorm2d和ReLU激活函数的组合，即一层上采样层。其构造函数需要传入in_channels、out_channels、kernel_size、stride、padding、output_padding和bn_momentum等参数。

2. ResNet50Decoder(nn.Module)：此类用于实现ResNet50的解码器部分，即利用DeconvLayer对ResNet50的特征图进行上采样，得到最终的输出结果。其构造函数需要传入inplanes和bn_momentum等参数。

以下是代码示例：

class DeconvLayer(nn.Module):
    def __init__(self, in_channels, out_channels, kernel_size, stride, padding, output_padding, bn_momentum=0.1, bias=False):
        super(DeconvLayer, self).__init__()
        self.conv_transpose = nn.ConvTranspose2d(in_channels, out_channels, kernel_size, stride, padding, output_padding, bias=bias)
        self.bn = nn.BatchNorm2d(out_channels, momentum=bn_momentum)
        self.relu = nn.ReLU(inplace=True)

    def forward(self, x):
        x = self.conv_transpose(x)
        x = self.bn(x)
        x = self.relu(x)
        return x


class ResNet50Decoder(nn.Module):
    def __init__(self, inplanes, bn_momentum=0.1):
        super(ResNet50Decoder, self).__init__()
        self.bn_momentum = bn_momentum
        self.inplanes = inplanes
        self.deconv_with_bias = False
        self.deconv_layers = self._make_deconv_layer(
            num_layers=3,
            num_filters=[256, 128, 64],
            num_kernels=[4, 4, 4],
        )

    def _make_deconv_layer(self, num_layers, num_filters, num_kernels):
        layers = []
        for i in range(num_layers):
            kernel = num_kernels[i]
            planes = num_filters[i]
            layers.append(DeconvLayer(
                in_channels=self.inplanes,
                out_channels=planes,
                kernel_size=kernel,
                stride=2,
                padding=1,
                output_padding=0,
                bn_momentum=self.bn_momentum,
                bias=self.deconv_with_bias
            ))
            self.inplanes = planes
        return nn.Sequential(*layers)

    def forward(self, x):
        return self.deconv_layers(x)