Added axis label to gather operation
Added axis label to gather operation

miaecle/deepchem,deepchem/deepchem,miaecle/deepchem,deepchem/deepchem,peastman/deepchem,lilleswing/deepchem,lilleswing/deepchem,lilleswing/deepchem,miaecle/deepchem,peastman/deepchem