class DepthWiseConv(nn.Module):
    """
    depth wise followed by point wise convolution
    """

    def __init__(self, in_planes, out_planes, stride=1, padding=-1):
        super().__init__()
        self.ds_conv = ConvBNReLU(in_planes, in_planes, kernel_size=3,
                                  stride=stride, groups=in_planes, padding=padding)
        self.pw_conv = ConvBNReLU(in_planes, out_planes, kernel_size=1)

    def forward(self, x):
        return self.pw_conv(self.ds_conv(x))