Update gdb7 tf fit_transform example
Update gdb7 tf fit_transform example

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