Local Patch Shuffle Transform Initial Version Added

[finalelement]

Signed-off-by: vnath vnath@nvidia.com

Description

This pull request for adding the Pixel Shuffle Transform. So far I've added the transform for local patch shuffling in the transform/spatial/array

It needs some testing and also simultaneous feedback as how to port it for the dictionary version of it

part of #2701
Also needs test cases.

Status

ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[wyli]

/black

[wyli]

thanks Vish, this looks like a nice starting point. just a reminder that there is still a style error: https://github.com/Project-MONAI/MONAI/pull/2757/checks?check_run_id=3316962486#step:7:116. for the shuffling, looks like the following is efficient as well https://stackoverflow.com/questions/22426609/shuffle-a-numpy-array:

>>> a = np.arange(9).reshape((3,3))
>>> a
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])
>>> np.random.shuffle(a.flat)
>>> a
array([[3, 5, 8],
       [7, 6, 2],
       [1, 4, 0]])

Also, the implementation currently supports 3d, but I think we could extend to support N-d input in the future.

[bhashemian]

Does it work only for 3D? what happen if we use it on 2D?

[wyli]

thanks, this is an initial patch shuffle, will need followups for the dictionary version and have ND support.