Fix HyperparamOpt for Keras models
Fix HyperparamOpt for Keras models

ktaneishi/deepchem,Agent007/deepchem,miaecle/deepchem,miaecle/deepchem,lilleswing/deepchem,rbharath/deepchem,deepchem/deepchem,Agent007/deepchem,rbharath/deepchem,joegomes/deepchem,lilleswing/deepchem,lilleswing/deepchem,Agent007/deepchem,ktaneishi/deepchem,deepchem/deepchem,joegomes/deepchem,ktaneishi/deepchem,peastman/deepchem,peastman/deepchem,miaecle/deepchem