!1846 reuse parameter in new ConstructKernelGraph

Merge pull request !1846 from Margaret_wangrui/reuse-parameter-in-new-ConstructKernelGraph

mindspore/ccsrc/session/session_basic.cc

@@ -324,8 +324,9 @@ ParameterPtr SessionBasic::CreateNewParameterFromParameter(const AnfNodePtr &anf
   if (python_paras_ == nullptr) {
     python_paras_ = std::make_shared<std::map<PyObject *, ParameterPtr>>();
   }
-  if (python_paras_->find(m_tensor) != python_paras_->end()) {
-    new_parameter = (*python_paras_)[m_tensor];
+  auto iter = python_paras_->find(m_tensor);
+  if (iter != python_paras_->end()) {
+    new_parameter = iter->second;
   } else {
     TraceManager::DebugTrace(std::make_shared<TraceCopy>(anf->debug_info()));
     new_parameter = graph->NewParameter(anf->cast<ParameterPtr>());
@@ -502,13 +503,23 @@ ParameterPtr SessionBasic::CreateNewParameter(const AnfNodePtr &anf, KernelGraph
   if (!anf->isa<Parameter>()) {
     MS_LOG(EXCEPTION) << "anf[" << anf->DebugString() << "] is not a parameter";
   }
-  auto graph_inputs = graph->MutableInputs();
-  MS_EXCEPTION_IF_NULL(graph_inputs);
-  TraceManager::DebugTrace(std::make_shared<TraceCopy>(anf->debug_info()));
-  auto new_parameter = graph->NewParameter(anf->cast<ParameterPtr>());
-  TraceManager::EndTrace();
-  graph_inputs->push_back(new_parameter);
-  graph->FrontBackendlMapAdd(anf, new_parameter);
+
+  auto m_tensor = GetParamDefaultInputTensor(anf);
+  ParameterPtr new_parameter = nullptr;
+  if (python_paras_ == nullptr) {
+    python_paras_ = std::make_shared<std::map<PyObject *, ParameterPtr>>();
+  }
+  auto iter = python_paras_->find(m_tensor);
+  if (iter != python_paras_->end()) {
+    new_parameter = iter->second;
+  } else {
+    TraceManager::DebugTrace(std::make_shared<TraceCopy>(anf->debug_info()));
+    new_parameter = graph->NewParameter(anf->cast<ParameterPtr>());
+    if (m_tensor != nullptr) {
+      (*python_paras_)[m_tensor] = new_parameter;
+    }
+    TraceManager::EndTrace();
+  }
 
   return new_parameter;
 }
@@ -571,7 +582,11 @@ std::shared_ptr<KernelGraph> SessionBasic::ConstructKernelGraph(const FuncGraphP
     MS_EXCEPTION_IF_NULL(node);
     MS_LOG(DEBUG) << "Start create new cnode, node = " << node->DebugString();
     if (node->isa<Parameter>()) {
-      (void)CreateNewParameter(node, graph.get());
+      auto graph_inputs = graph->MutableInputs();
+      MS_EXCEPTION_IF_NULL(graph_inputs);
+      auto new_parameter = CreateNewParameter(node, graph.get());
+      graph_inputs->push_back(new_parameter);
+      graph->FrontBackendlMapAdd(node, new_parameter);
       continue;
     } else if (node->isa<ValueNode>()) {
       if (!IsValueNode<FuncGraph>(node)) {
@@ -629,7 +644,8 @@ void SessionBasic::AddParameterToGraphInputs(const std::vector<AnfNodePtr> &para
     auto backend_parameter = graph->GetBackendAnfByFrontAnf(parameter);
     if (backend_parameter == nullptr) {
       // for example "def f(x,y,z) {return x + y}", parameter z in unused
-      CreateNewParameterFromParameter(parameter, true, graph);
+      auto new_parameter = CreateNewParameter(parameter, graph);
+      graph_inputs->push_back(new_parameter);
       MS_LOG(INFO) << "Can't find parameter:" << parameter->DebugString();
       continue;
     }