From dc954d4c9638c02a0e3181175a0f48c203f3de69 Mon Sep 17 00:00:00 2001
From: yujianfeng <yujianfeng5@huawei.com>
Date: Wed, 14 Oct 2020 17:29:14 +0800
Subject: [PATCH] Fix checking nop for a cnode whose first input is not a value
 node

---
 mindspore/ccsrc/backend/optimizer/common/helper.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mindspore/ccsrc/backend/optimizer/common/helper.cc b/mindspore/ccsrc/backend/optimizer/common/helper.cc
index 388858be75..794e2071ec 100644
--- a/mindspore/ccsrc/backend/optimizer/common/helper.cc
+++ b/mindspore/ccsrc/backend/optimizer/common/helper.cc
@@ -405,6 +405,14 @@ bool IsNopNode(const AnfNodePtr &node) {
   }
   CNodePtr cnode = node->cast<CNodePtr>();
   MS_EXCEPTION_IF_NULL(cnode);
+  if (cnode->inputs().empty()) {
+    return false;
+  }
+  auto input0 = cnode->input(0);
+  MS_EXCEPTION_IF_NULL(input0);
+  if (!input0->isa<ValueNode>()) {
+    return false;
+  }
   bool is_nop_node = false;
   if (AnfAlgo::HasNodeAttr("nop_op", cnode)) {
     is_nop_node = AnfAlgo::GetNodeAttr<bool>(cnode, "nop_op");