No randomness for threading=True

[marcus-wirtz-snkeos]

MONAI/monai/transforms/compose.py

Line 110 in ac86ed4

_transform = deepcopy(_transform) if isinstance(_transform, ThreadUnsafe) else _transform

When using threading=True, the random state of any Randomizable transformation is only updated within its copy, thus the original random state will be untouched generating the same samples over and over.

I already saw that somewhere in the docs there is a mentioning of "limited randomness" for threading (even though I find that a rather optimistic description). Are there plans how to tackle this issue? Or won't it be supported?

[marcus-wirtz-snkeos]

I made a proposal in PR #7925 to fix this issue. Not sure whether it might have some other unwanted implications, so it would be nice to have a review from an experienced contributor 🙏