remove some unused codes

paddle/fluid/framework/details/multi_devices_graph_pass.cc

@@ -326,7 +326,7 @@ std::unique_ptr<ir::Graph> MultiDevSSAGraphBuilder::ApplyImpl(
   ir::Graph &result = *graph;
 
   for (auto &node : nodes) {
-    if (node->NodeType() == ir::Node::Type::kVariable && node->Var()) {
+    if (node->IsVar() && node->Var()) {
       all_vars_.emplace(node->Name(), node->Var());
     }
   }
@@ -583,18 +583,6 @@ void MultiDevSSAGraphBuilder::InsertDataBalanceOp(
   }
 }
 
-bool MultiDevSSAGraphBuilder::IsParameterGradientOnce(
-    const std::string &og,
-    std::unordered_set<std::string> *og_has_been_broadcast) const {
-  bool is_pg_once =
-      grad_names_.count(og) != 0 && og_has_been_broadcast->count(og) == 0;
-  if (is_pg_once) {
-    // Insert NCCL AllReduce Op
-    og_has_been_broadcast->insert(og);
-  }
-  return is_pg_once;
-}
-
 int MultiDevSSAGraphBuilder::GetOpDeviceID(const ir::Graph &graph,
                                            ir::Node *node) const {
   if (strategy_.reduce_ != BuildStrategy::ReduceStrategy::kReduce) {
@@ -688,20 +676,6 @@ VarHandle *MultiDevSSAGraphBuilder::CreateReduceOp(ir::Graph *result,
   return var;
 }
 
-// Find the first occurence of `prev_op_name` and make current `op` depend
-// on it.
-void MultiDevSSAGraphBuilder::ConnectOp(ir::Graph *result, OpHandleBase *op,
-                                        const std::string &prev_op_name) const {
-  for (auto &prev_op : result->Get<GraphOps>(kGraphOps)) {
-    if (prev_op->Name() == prev_op_name) {
-      auto *dep_var = new DummyVarHandle(result->CreateControlDepVar());
-      prev_op->AddOutput(dep_var);
-      result->Get<GraphDepVars>(kGraphDepVars).emplace(dep_var);
-      op->AddInput(dep_var);
-    }
-  }
-}
-
 void MultiDevSSAGraphBuilder::CreateDistTrainOp(ir::Graph *result,
                                                 ir::Node *node) const {
   int op_dev_id = -1;

paddle/fluid/framework/details/multi_devices_graph_pass.h

@@ -69,9 +69,6 @@ class MultiDevSSAGraphBuilder : public ir::Pass {
   std::vector<std::string> FindDistTrainRecvVars(
       const std::vector<ir::Node *> &nodes) const;
 
-  void ConnectOp(ir::Graph *result, OpHandleBase *op,
-                 const std::string &prev_op_name) const;
-
   void CreateComputationalOps(ir::Graph *result, ir::Node *node,
                               size_t num_places) const;
 
@@ -83,10 +80,6 @@ class MultiDevSSAGraphBuilder : public ir::Pass {
   void CreateComputationalOp(ir::Graph *result, ir::Node *node,
                              int dev_id) const;
 
-  bool IsParameterGradientOnce(
-      const std::string &og,
-      std::unordered_set<std::string> *og_has_been_broadcast) const;
-
   int GetOpDeviceID(const ir::Graph &graph, ir::Node *node) const;
 
   void InsertAllReduceOp(ir::Graph *result, const std::string &og) const;