restore the huber_loss_op

test=develop

paddle/fluid/operators/huber_loss_op.h

@@ -104,19 +104,15 @@ class HuberLossGradKernel : public framework::OpKernel<T> {
     if (out0) {
       out0->mutable_data<T>(context.GetPlace());
       auto x_grad = EigenVector<T>::Flatten(*out0);
-      // MSVC not treat it well when partial template arguments were specified
       x_grad.device(place) =
-          out_grad *
-          residual.unaryExpr(HuberLossBackward<T>(delta, static_cast<T>(-1.0)));
+          out_grad * residual.unaryExpr(HuberLossBackward<T>(delta, -1.0));
     }
 
     if (out1) {
       out1->mutable_data<T>(context.GetPlace());
       auto y_grad = EigenVector<T>::Flatten(*out1);
-      // MSVC not treat it well when partial template arguments were specified
       y_grad.device(place) =
-          out_grad *
-          residual.unaryExpr(HuberLossBackward<T>(delta, static_cast<T>(1.0)));
+          out_grad * residual.unaryExpr(HuberLossBackward<T>(delta, 1.0));
     }
   }
 };