fix ci fail

test=release/1.1

Author: chengduozh

paddle/fluid/framework/operator.cc

@@ -358,7 +358,7 @@ static bool VarIsTensor(const Variable* var) {
   return var->IsType<LoDTensor>() || var->IsType<SelectedRows>();
 }
 
-static const Tensor* GetTensorFromVar(Variable* var) {
+const Tensor* GetTensorFromVar(Variable* var) {
   if (var->IsType<LoDTensor>()) {
     return var->GetMutable<LoDTensor>();
   } else if (var->IsType<SelectedRows>()) {

paddle/fluid/framework/operator.h

@@ -63,6 +63,7 @@ inline std::string GradVarName(const std::string& var_name) {
 }
 
 proto::VarType::Type GetDataTypeOfVar(const Variable* var);
+const Tensor* GetTensorFromVar(Variable* var);
 
 class OperatorBase;
 class ExecutionContext;

paddle/fluid/operators/sum_op.cc

@@ -81,10 +81,10 @@ class SumOp : public framework::OperatorWithKernel {
 
     if (x_vars[0]->IsType<framework::LoDTensor>()) {
       int dtype = -1;
-      auto x_var_names = ctx.Inputs("X");
-      for (auto& x_var_n : x_var_names) {
+      for (auto& x_var : x_vars) {
         // FIXME(zcd): The input x_var may be SelectedRows or LoDTensor.
-        auto tensor = ctx.Input<Tensor>(x_var_n);
+        auto tensor = framework::GetTensorFromVar(
+            const_cast<framework::Variable*>(x_var));
         if (tensor->numel() == 0) {
           continue;
         }