Added option for setting activation function
Added option for setting activation function

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