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remove unneccesary checks from posterize_image_tensor #6823

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remove unneccesary checks from posterize_image_tensor #6823

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9781b83
remove unneccesary checks from posterize_image_tensor
pmeier Oct 24, 2022
292b8bb
fix JIT
pmeier Oct 24, 2022
52d49d4
Merge branch 'main' into perf/posterize
pmeier Oct 24, 2022
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10 changes: 9 additions & 1 deletion torchvision/prototype/transforms/functional/_color.py
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Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,15 @@ def adjust_gamma(inpt: features.InputTypeJIT, gamma: float, gain: float = 1) ->
return adjust_gamma_image_pil(inpt, gamma=gamma, gain=gain)


posterize_image_tensor = _FT.posterize
def posterize_image_tensor(image: torch.Tensor, bits: int) -> torch.Tensor:
if image.dtype != torch.uint8:
raise TypeError(f"Only torch.uint8 image tensors are supported, but found {image.dtype}")

# JIT-friendly for: ~(2 ** (8 - bits) - 1)
mask = -int(2 ** (8 - bits))
return image & mask


posterize_image_pil = _FP.posterize


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