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class invPixelShuffle(nn.Module):
        
    def __init__(self, ratio=2):
        super(invPixelShuffle, self).__init__()
        self.ratio = ratio
    def forward(self, tensor):
        ratio = self.ratio
        b = tensor.size(0)
        ch = tensor.size(1)
        y = tensor.size(2)
        x = tensor.size(3)
        assert x % ratio ==0 and y % ratio ==0, 'x, y, ratio : {}, {}, {}'.format(x, y, ratio)

        return tensor.view(b, ch, y//ratio, ratio, x//ratio, ratio).permute(0,1,3,5,2,4).contiguous().view(b, -1, y//ratio, x//ratio)