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PixelShuffle

class torch.nn.PixelShuffle(upscale_factor)[source]

Rearranges elements in a tensor of shape (,C×r2,H,W)(*, C \times r^2, H, W) to a tensor of shape (,C,H×r,W×r)(*, C, H \times r, W \times r), where r is an upscale factor.

This is useful for implementing efficient sub-pixel convolution with a stride of 1/r1/r.

See the paper: Real-Time Single Image and Video Super-Resolution Using an Efficient Sub-Pixel Convolutional Neural Network by Shi et. al (2016) for more details.

Parameters:

upscale_factor (int) – factor to increase spatial resolution by

Shape:
  • Input: (,Cin,Hin,Win)(*, C_{in}, H_{in}, W_{in}), where * is zero or more batch dimensions

  • Output: (,Cout,Hout,Wout)(*, C_{out}, H_{out}, W_{out}), where

Cout=Cin÷upscale_factor2C_{out} = C_{in} \div \text{upscale\_factor}^2
Hout=Hin×upscale_factorH_{out} = H_{in} \times \text{upscale\_factor}
Wout=Win×upscale_factorW_{out} = W_{in} \times \text{upscale\_factor}

Examples:

>>> pixel_shuffle = nn.PixelShuffle(3)
>>> input = torch.randn(1, 9, 4, 4)
>>> output = pixel_shuffle(input)
>>> print(output.size())
torch.Size([1, 1, 12, 12])

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