How to modify a Conv2d to Depthwise Separable Convolution?

7

Here is a simple example:

class depthwise_separable_conv(nn.Module):
    def __init__(self, nin, nout):
        super(depthwise_separable_conv, self).__init__()
        self.depthwise = nn.Conv2d(nin, nin, kernel_size=3, padding=1, groups=nin)
        self.pointwise = nn.Conv2d(nin, nout, kernel_size=1)

    def forward(self, x):
        out = self.depthwise(x)
        out = self.pointwise(out)
        return out
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