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fix contrast() transform #821

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fix contrast() transform #821

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14 changes: 1 addition & 13 deletions algoperf/workloads/imagenet_resnet/imagenet_jax/randaugment.py
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Original file line number Diff line number Diff line change
Expand Up @@ -133,19 +133,7 @@ def color(image, factor):

def contrast(image, factor):
"""Equivalent of PIL Contrast."""
degenerate = tf.image.rgb_to_grayscale(image)
# Cast before calling tf.histogram.
degenerate = tf.cast(degenerate, tf.int32)

# Compute the grayscale histogram, then compute the mean pixel value,
# and create a constant image size of that value. Use that as the
# blending degenerate target of the original image.
hist = tf.histogram_fixed_width(degenerate, [0, 255], nbins=256)
mean = tf.reduce_sum(tf.cast(hist, tf.float32)) / 256.0
degenerate = tf.ones_like(degenerate, dtype=tf.float32) * mean
degenerate = tf.clip_by_value(degenerate, 0.0, 255.0)
degenerate = tf.image.grayscale_to_rgb(tf.cast(degenerate, tf.uint8))
return blend(degenerate, image, factor)
return tf.image.adjust_contrast(image, factor)


def brightness(image, factor):
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