Polish code

test=develop

paddle/fluid/operators/nce_op.cc

@@ -230,14 +230,14 @@ class NCEOpGradVarTypeInference : public framework::VarTypeInference {
     auto attr = op_desc.GetAttr("is_sparse");
     bool is_sparse = boost::get<bool>(attr);
     if (is_sparse) {
-      VLOG(30) << "nce_op_grad op " << weight_grad << " and " << bias_grad
-               << " is set to SelectedRows";
+      VLOG(3) << "nce_op_grad op " << weight_grad << " and " << bias_grad
+              << " is set to SelectedRows";
       block->Var(weight_grad)
           ->SetType(framework::proto::VarType::SELECTED_ROWS);
       block->Var(bias_grad)->SetType(framework::proto::VarType::SELECTED_ROWS);
     } else {
-      VLOG(30) << "nce_op_grad op " << weight_grad << " and " << bias_grad
-               << " is set to LoDTensor";
+      VLOG(3) << "nce_op_grad op " << weight_grad << " and " << bias_grad
+              << " is set to LoDTensor";
       block->Var(weight_grad)->SetType(framework::proto::VarType::LOD_TENSOR);
       block->Var(bias_grad)->SetType(framework::proto::VarType::LOD_TENSOR);
     }