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Fix ChannelShuffle #418

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Fix ChannelShuffle #418

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69bac3a
alt shuffle indices
innat May 7, 2022
980d9bd
refactor
innat May 7, 2022
06a146c
update
innat May 15, 2022
c103750
Merge branch 'keras-team:master' into fix_chl_sfl
innat May 16, 2022
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12 changes: 8 additions & 4 deletions keras_cv/layers/preprocessing/channel_shuffle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@

import tensorflow as tf

import keras_cv


@tf.keras.utils.register_keras_serializable(package="keras_cv")
class ChannelShuffle(tf.keras.__internal__.layers.BaseImageAugmentationLayer):
Expand Down Expand Up @@ -65,10 +67,12 @@ def augment_image(self, image, transformation=None):
)

channels_per_group = num_channels // self.groups
image = tf.reshape(image, [height, width, self.groups, channels_per_group])
image = tf.transpose(image, perm=[2, 0, 1, 3])
image = tf.random.shuffle(image, seed=self.seed)
image = tf.transpose(image, perm=[1, 2, 3, 0])

rand_uniform = keras_cv.UniformFactorSampler(lower=0, upper=1, seed=self.seed)
rand_indices = tf.argsort(rand_uniform(shape=[self.groups]))

image = tf.reshape(image, [height, width, channels_per_group, self.groups])
image = tf.gather(image, rand_indices, axis=-1)
image = tf.reshape(image, [height, width, num_channels])

return image
Expand Down