Fix compile error

paddle/framework/backward.cc

@@ -78,18 +78,16 @@ static std::shared_ptr<OperatorBase> BackwardImpl(
         std::string prefix = grad_input.substr(
             0, grad_input.size() - OperatorBase::GRAD_VAR_SUFFIX().size());
         grad_input = prefix + OperatorBase::ZERO_VAR_SUFFIX();
-        std::vector<std::string> fill_zeros_in = {prefix};
-        std::vector<std::string> fill_zeros_out = {grad_input};
-        net.AddOp(OpRegistry::CreateOp("fill_zeros_like", fill_zeros_in,
-                                       fill_zeros_out, AttributeMap()));
+        net->AddOp(OpRegistry::CreateOp("fill_zeros_like", {prefix},
+                                        {grad_input}, {}));
       }
     }
-    for (std::string& grad_output : grad_op->output_) {
+    for (std::string& grad_output : grad_op->outputs_) {
       if (no_grad_names.count(grad_output)) {
         grad_output = OperatorBase::EMPTY_VAR_NAME();
       }
     }
-    net.AddOp(grad_op);
+    net->AddOp(grad_op);
   }
 
   net->CompleteAddOp();