bbox_params in nested Composes

[AdeelH]

It seems like when you have nested Composes, you only need to specify bbox_params in the outer most Compose. For example, the following transform works without problems:

bbox_params = A.BboxParams(format='albumentations', label_fields=['category_id'])
tf = A.Compose([
    A.Compose([
        A.Compose([
            A.ShiftScaleRotate(always_apply=True),
        ]),
    ]),
], bbox_params=bbox_params)

This behavior does not seem to be documented anywhere. Can you confirm that this is the intended behavior and that it always holds?

[Dipet]

Yes, it is not documented, but it is works. We do not recomend use Compose as inner transform. For this purpose we have Sequential