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OneOf Compose can't support non-invertible transforms #3525

@Nic-Ma

Description

@Nic-Ma

Is your feature request related to a problem? Please describe.
Issue reported from internal SA team, OneOf compose method can't support non-invertible transforms.
Program to reproduce the issue:

transform = Compose([
    Resized(keys="img", spatial_size=[100, 100, 100]),
    OneOf([
        RandScaleIntensityd(keys="img", factors=0.5, prob=1.0),
        RandShiftIntensityd(keys="img", offsets=0.5, prob=1.0),
    ]),
])
transform.set_random_state(seed=0)
result = transform({"img": np.ones((1, 101, 102, 103))})

result = transform.inverse(result)
print(result["img"].shape)

Got the error:

Traceback (most recent call last):
  File "/workspace/data/medical/MONAI/monai/transforms/transform.py", line 82, in apply_transform
    return _apply_transform(transform, data, unpack_items)
  File "/workspace/data/medical/MONAI/monai/transforms/transform.py", line 53, in _apply_transform
    return transform(parameters)
  File "/workspace/data/medical/MONAI/monai/transforms/compose.py", line 264, in inverse
    raise RuntimeError(f"Applied OneOf transform is not invertible (applied index: {index}).")
RuntimeError: Applied OneOf transform is not invertible (applied index: 1).

The above exception was the direct cause of the following exception:
...

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