I have never used this module however when trying out new data transformers it often makes sense to simply do a manual test where you run the data through the transformer and directly observe the output. From this direct observation you can decide a value based on how far you can push the parameters and still have the image be perceived as its original class.
Also, if you are interested in more augmentation this repro 1.0k takes it much further then the transformers provided in the torchvision system.