Augmentation parameters explained?

[StuffyMonkey]

ultralytics/cfg/default.yaml contains augmentations hyperparameters with short explanation. However some of them is not clarified enough. For example I'm especially interested in scale parameter. According to Albumentations standard it could be in range (0, +inf) which make sense, but here we have range (0, 1). What does that mean, for example, If I want to scale my image 2 times closer than original, what value should I take? In the case of albumentations it will be 2.0, but here it is unclear to me.

Thanks for your help!