Created
January 30, 2023 21:28
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import tensorflow as tf | |
import torch | |
import torch.nn.functional as F | |
# adapted from: https://discuss.pytorch.org/t/tf-extract-image-patches-in-pytorch/43837/8 | |
def torch_extract_patches( | |
x, patch_height, patch_width, padding=None | |
): | |
x = x.unsqueeze(0) | |
if padding == "SAME": | |
x = F.pad(x, (1, 1, 1, 1)) | |
# patches = x.unfold(2, patch_height, patch_height).unfold(3, patch_width, patch_width) | |
patches = x.unfold(2, patch_height, patch_height).unfold(3, patch_width, patch_width) | |
# Permute so that channels are next to patch dimension | |
patches = patches.permute(0, 2, 3, 1, 5, 4).contiguous() # [128, 32, 32, 16, 3, 3] | |
# View as [batch_size, height, width, channels*kh*kw] | |
patches = patches.reshape(*patches.size()[:3], -1) | |
return patches | |
# H x W x C | |
image_tf = tf.random.uniform(shape=(720, 720, 3)) | |
image_torch = torch.from_numpy(image_tf.numpy()).permute(2, 0, 1) | |
patch_height, patch_width = 16, 16 | |
patches_tf = tf.image.extract_patches( | |
images=tf.expand_dims(image_tf, 0), | |
sizes=[1, patch_height, patch_width, 1], | |
strides=[1, patch_height, patch_width, 1], | |
rates=[1, 1, 1, 1], | |
padding="SAME" | |
) | |
patches_torch = torch_extract_patches( | |
x=image_torch, | |
patch_height=patch_height, | |
patch_width=patch_width, | |
padding="SAME" | |
) | |
assert torch.allclose( | |
patches_torch.squeeze(0), | |
torch.from_numpy(patches_tf.numpy()[0, :, :, :]), | |
atol=1e-3, | |
rtol=1e-3 | |
) |
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