public SDVariable mul(SDVariable sameDiffVariable) {
        return mul(sameDiff.generateNewVarName(new MulOp().opName(),0),sameDiffVariable);

    }
public SDVariable mul ( SDVariable sameDiffVariable ) { return mul ( sameDiff . generateNewVarName ( new MulOp ( ) . opName ( ) , 0 ) , sameDiffVariable ) ; }
@param sameDiffVariable
@return