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Merged
copybara-service merged 2 commits into from
Aug 13, 2026
+14 −1
Merged

Add channel_axis to random_flip_left_right #116

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37735ae
Add channel axis to random horizontal flip
v1shay Aug 12, 2026
faf70bc
Re-run CLA check
v1shay Aug 12, 2026
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9 changes: 8 additions & 1 deletion dm_pix/_src/augment.py
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Original file line number Diff line number Diff line change
Expand Up @@ -772,6 +772,7 @@ def random_flip_left_right(
image: chex.Array,
*,
probability: chex.Numeric = 0.5,
channel_axis: int = -1,
) -> chex.Array:
"""Applies `flip_left_right` with a given probability.

Expand All @@ -781,14 +782,20 @@ def random_flip_left_right(
...HWC or ...CHW.
probability: the probability of applying flip_left_right transform. Must be
a value in [0, 1].
channel_axis: the index of the channel axis.

Returns:
A left-right flipped image if condition is met, otherwise original image.
"""
# DO NOT REMOVE - Logging usage.

should_transform = jax.random.bernoulli(key=key, p=probability)
return jax.lax.cond(should_transform, flip_left_right, lambda x: x, image)
return jax.lax.cond(
should_transform,
lambda x: flip_left_right(x, channel_axis=channel_axis),
lambda x: x,
image,
)


def random_flip_up_down(
Expand Down
6 changes: 6 additions & 0 deletions dm_pix/_src/augment_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,12 @@ def test_flip(self, images_list):
reference_fn=None,
probability=(0., 1.))

def test_random_flip_left_right_channel_axis(self):
image = jnp.arange(2 * 3 * 4, dtype=jnp.float32).reshape((3, 2, 4))
result = augment.random_flip_left_right(
jax.random.PRNGKey(0), image, probability=1., channel_axis=0)
np.testing.assert_array_equal(result, jnp.flip(image, axis=2))

# Due to a bug in scipy we cannot test all available modes, refer to these
# issues for more information: https://github.com/jax-ml/jax/issues/11097,
# https://github.com/jax-ml/jax/issues/11097
Expand Down