modify CheckpointStrategy to adapt load operator

mindspore/ccsrc/frontend/parallel/step_parallel.cc

@@ -2701,14 +2701,13 @@ std::vector<std::pair<std::string, int64_t>> NodeParameterName(const CNodePtr &n
       if (!IsValueNode<Primitive>(cnode->input(0))) {
         return param_names;
       }
-      ValueNodePtr prim_anf_node = cnode->input(0)->cast<ValueNodePtr>();
-      PrimitivePtr prim = prim_anf_node->value()->cast<PrimitivePtr>();
-      if (prim->name() == CAST && cnode->inputs().size() >= 1) {
-        auto cast_input = cnode->inputs()[1];
-        if (cast_input->isa<Parameter>()) {
-          auto cast_input_parameter = cast_input->cast<ParameterPtr>();
-          if (cast_input_parameter->has_default() && ParameterRequireGrad(cast_input_parameter)) {
-            param_names.push_back({cast_input_parameter->name(), i});
+      if ((IsPrimitiveCNode(cnode, prim::kPrimCast) && cnode->inputs().size() >= 1) ||
+          IsPrimitiveCNode(cnode, prim::kPrimLoad)) {
+        auto inp = cnode->input(1);
+        if (inp->isa<Parameter>()) {
+          auto inp_param = inp->cast<ParameterPtr>();
+          if (inp_param->has_default() && ParameterRequireGrad(inp_param)) {
+            param_names.push_back({inp_param->name(), i});
           }
         }
       }