fix use gpu test=develop

paddle/fluid/framework/details/multi_devices_graph_pass.cc

@@ -731,6 +731,7 @@ bool DistSSAGraphBuilder::DealWithSpecialOp(ir::Graph *result,
       }
     }
     insert_op = true;
+    need_broadcast_var_ = true;
   } else if (OpHaveRole(*node, OpRole::kDist)) {
     int op_dev_id = CreateDistTrainOp(result, node);
     if (node->Op()->Type() == "concat") {
@@ -925,14 +926,17 @@ void DistSSAGraphBuilder::InsertCollectiveOp(ir::Graph *result,
 
 void DistSSAGraphBuilder::InsertPostprocessOps(ir::Graph *result) const {
   // only GPU reduce mode need to broadcast parameters to each device.
-  if (UseGPU() && strategy_.reduce_ == BuildStrategy::ReduceStrategy::kReduce) {
-    if (strategy_.fuse_broadcast_op_) {
-      CreateFusedBroadcastOp(result, bcast_var_name_set_);
-    } else {
-      for (size_t dev_id = 0; dev_id < bcast_var_name_set_.size(); ++dev_id) {
-        auto &to_bcast_set = bcast_var_name_set_[dev_id];
-        for (auto &bcast_name : to_bcast_set) {
-          CreateBroadcastOp(result, bcast_name, dev_id);
+  if (UseGPU()) {
+    if (need_broadcast_var_ ||
+        strategy_.reduce_ == BuildStrategy::ReduceStrategy::kReduce) {
+      if (strategy_.fuse_broadcast_op_) {
+        CreateFusedBroadcastOp(result, bcast_var_name_set_);
+      } else {
+        for (size_t dev_id = 0; dev_id < bcast_var_name_set_.size(); ++dev_id) {
+          auto &to_bcast_set = bcast_var_name_set_[dev_id];
+          for (auto &bcast_name : to_bcast_set) {
+            CreateBroadcastOp(result, bcast_name, dev_id);
+          }
         }
       }
     }

paddle/fluid/framework/details/multi_devices_graph_pass.h

@@ -174,6 +174,7 @@ class DistSSAGraphBuilder : public BalanceVarSSAGraphBuilder {
   int CreateDistTrainOp(ir::Graph *result, ir::Node *node) const;
 
   mutable std::vector<std::unordered_set<std::string>> bcast_var_name_set_;
+  mutable bool need_broadcast_var_{false};
 };
 
 std::unordered_set<std::string> &MultiDevSSAGraphBuilder();