Update ImageAugmentation translation_factor hyperparameter to have a range (#1714)
Update ImageAugmentation translation_factor hyperparameter to have a range (#1714)

* Update rotation factor docstring

* fixed imports on preprocessing.py

* Add type hint for rotation_factor

* Add hyperparameters.Choice support for translation_factor of ImageAugmentation block

Co-authored-by: Nick Smyrnioudis <e99a92868328ece89119dd126360c2810afc86fb@outlook.com>
keras-team/autokeras,keras-team/autokeras,keras-team/autokeras