fix insert cast in cpu pynative mode

mindspore/ccsrc/backend/kernel_compiler/common_utils.cc

@@ -693,6 +693,9 @@ void GetFuncGraphOutputNodes(const FuncGraphPtr &func_graph, std::vector<AnfNode
       for (size_t input_idx = 1; input_idx < cnode->inputs().size(); ++input_idx) {
         auto input_node = cnode->input(input_idx);
         MS_EXCEPTION_IF_NULL(input_node);
+        if (input_node->isa<CNode>() && AnfAlgo::GetInputTensorNum(input_node) == 0) {
+          continue;
+        }
         output_list->push_back(AnfAlgo::VisitKernel(input_node, 0).first);
       }
     } else {

mindspore/ccsrc/backend/optimizer/cpu/insert_cast_cpu.cc

@@ -91,7 +91,7 @@ void InsertCast(const FuncGraphPtr &func_graph, const CNodePtr &cnode) {
   }
 }
 
-void InsertCastForGraphOutput(const FuncGraphPtr &func_graph, const CNodePtr &cnode) {
+void InsertCastForGraphOutput(const FuncGraphPtr &func_graph, const CNodePtr &cnode, const AnfNodePtr &func_output) {
   MS_EXCEPTION_IF_NULL(cnode);
   size_t output_num = AnfAlgo::GetOutputTensorNum(cnode);
   for (size_t i = 0; i < output_num; i++) {
@@ -102,6 +102,9 @@ void InsertCastForGraphOutput(const FuncGraphPtr &func_graph, const CNodePtr &cn
       auto used_node_list = GetRealNodeUsedListByOutputIdx(func_graph, cnode, i);
       for (size_t j = 0; j < used_node_list->size(); j++) {
         auto used_node = used_node_list->at(j).first;
+        if (used_node != func_output) {
+          continue;
+        }
         auto used_node_index = static_cast<size_t>(used_node_list->at(j).second - 1);
         auto cur_input = AnfAlgo::GetInputNode(utils::cast<CNodePtr>(used_node), used_node_index);
         const std::vector<size_t> origin_shape =
@@ -128,10 +131,11 @@ bool InsertCastCPU::Run(const FuncGraphPtr &func_graph) {
   }
   AnfNodePtrList outputs;
   kernel::GetFuncGraphOutputNodes(func_graph, &outputs);
+  auto func_output = func_graph->output();
   for (auto node : outputs) {
     if (node != nullptr && node->isa<CNode>() && AnfAlgo::IsRealKernel(node)) {
       auto cnode = node->cast<CNodePtr>();
-      InsertCastForGraphOutput(func_graph, cnode);
+      InsertCastForGraphOutput(func_graph, cnode, func_output);
     }
   }
   return true;