### Changes - __Breaking__: downgrade keras to keras 2 (tf-keras) - __Breaking__: move JSONEncoderExt to seperate module to optimize loading - __Breaking__: new parameter in orcai_parameter: "ReduceLROnPlateau_min_learning_rate": 1e-06 - add to orcai_parameters.json to unbreak. ### Notes - keras 2 trains better models. Reason unknown. - tried to revert to Sebs DataLoader function, inheriting from keras.utils.Sequence. No difference detected except worse performance.