!1758 fix return parameter directly in net

Merge pull request !1758 from fary86/fix_return_parameter_directly_in_net

mindspore/ccsrc/utils/convert_utils.cc

@@ -30,6 +30,7 @@
 #include "pipeline/parse/parse_base.h"
 #include "ir/value.h"
 #include "ir/tensor.h"
+#include "ir/param_value_py.h"
 #include "utils/base_ref_extends.h"
 
 namespace mindspore {
@@ -426,7 +427,17 @@ bool IsGraphOutputValueNodeOrParameter(const AnfNodePtr &output, const py::tuple
       MS_EXCEPTION(UnknownError) << "Index " << index << " equal or larger than args size " << args.size()
                                  << " add Parameter count " << func_graph->hyper_param_count() << ".";
     }
-    *ret_val = args[index];
+    if (index < args.size()) {
+      *ret_val = args[index];
+    } else {
+      auto param = dyn_cast<Parameter>(params[index]);
+      MS_EXCEPTION_IF_NULL(param);
+      if (!param->has_default()) {
+        MS_LOG(EXCEPTION) << "Can not determine value of Parameter " << index << " (" << param->name() << ")";
+      }
+      auto param_value = std::dynamic_pointer_cast<ParamValuePy>(param->default_param());
+      *ret_val = param_value->value().attr("data");
+    }
     return true;
   }
   return false;