!560 Optimize-depend pass enhance

Merge pull request !560 from huanghui/optimize-depend

mindspore/ccsrc/pre_activate/pass/optimize_dependence.cc

@@ -28,8 +28,7 @@ namespace mindspore {
 namespace opt {
 constexpr auto kSingleInputIndex = 1;
 namespace {
-AnfNodePtr GetReplaceNode(const FuncGraphPtr &func_graph, const AnfNodePtr &node) {
-  MS_EXCEPTION_IF_NULL(func_graph);
+AnfNodePtr GetReplaceNode(const AnfNodePtr &node) {
   MS_EXCEPTION_IF_NULL(node);
   if (!node->isa<CNode>()) {
     return nullptr;
@@ -41,15 +40,6 @@ AnfNodePtr GetReplaceNode(const FuncGraphPtr &func_graph, const AnfNodePtr &node
   if (op_name != kTransDataOpName && op_name != prim::kPrimCast->name()) {
     return nullptr;
   }
-  auto manager = func_graph->manager();
-  MS_EXCEPTION_IF_NULL(manager);
-  // Check whether the node has only one output node.
-  if (manager->node_users().find(cnode) == manager->node_users().end()) {
-    MS_LOG(EXCEPTION) << "The node should be used by at least another node's input";
-  }
-  if (manager->node_users()[cnode].size() > 1) {
-    return nullptr;
-  }
   CheckCNodeInputSize(cnode, kSingleInputIndex + 1);
   return cnode->input(kSingleInputIndex);
 }
@@ -63,7 +53,7 @@ bool ReplaceMakeTuple(const FuncGraphPtr &func_graph, const CNodePtr &cnode) {
   std::vector<AnfNodePtr> new_make_tuple_inputs;
   bool need_update = false;
   for (const auto &input : cnode->inputs()) {
-    AnfNodePtr replace_input = GetReplaceNode(func_graph, input);
+    AnfNodePtr replace_input = GetReplaceNode(input);
     // If replace input is not null, it will be the input of the TransData or Cast.
     if (replace_input == nullptr) {
       new_make_tuple_inputs.push_back(input);
@@ -119,7 +109,7 @@ const AnfNodePtr OptimizeDependence::Process(const FuncGraphPtr &func_graph, con
   if (ReplaceMakeTuple(func_graph, replacing_cnode)) {
     return nullptr;
   }
-  AnfNodePtr replace_node = GetReplaceNode(func_graph, replacing_cnode);
+  AnfNodePtr replace_node = GetReplaceNode(replacing_cnode);
   if (replace_node == nullptr) {
     MS_LOG(DEBUG) << "Can not find the TransData or Cast with single output node. Depend node: " << node->DebugString();
     return nullptr;