[TorchToLinalg] Add lowering of torch.aten.pixel_unshuffle op #4278
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This PR will fix the following issue:
Add lowering of torch.aten.pixel_unshuffle op to linalg dialect
This code snippet can reproduce the issue:
module { func.func @pixel_unshuffle(%arg0: !torch.vtensor<[1,8,4,4],f32>) -> !torch.vtensor<[1,32,2,2],f32> attributes {torch.assume_strict_symbolic_shapes} { %int2 = torch.constant.int 2 %0 = torch.aten.pixel_unshuffle %arg0, %int2 : !torch.vtensor<[1,8,4,4],f32>, !torch.int -> !torch.vtensor<[1,32,2,2],f32> return %0 : !torch.vtensor<[1,32,2,2],f32> } }The decomposition is based on this specification:
https://docs.pytorch.org/docs/stable/generated/torch.nn.functional.pixel_unshuffle.html
and PyTorch implementation could be found in main/aten/src/ATen/native/PixelShuffle.cpp:
https://github.com/pytorch/pytorch/blob/main/aten/src/ATen/native/PixelShuffle.cpp