Fix FrameworkNodeAttr Deserialization

ngraph/core/include/openvino/op/util/framework_node.hpp

@@ -50,7 +50,7 @@ class OPENVINO_API FrameworkNodeAttrs {
         return m_attrs.end();
     }
 
-    std::string operator[](const std::string& key) {
+    std::string& operator[](const std::string& key) {
         return m_attrs[key];
     }
 
@@ -59,7 +59,7 @@ class OPENVINO_API FrameworkNodeAttrs {
     }
 
     bool operator==(const FrameworkNodeAttrs& other) const {
-        return m_type_name == other.m_type_name && m_opset_name == other.m_opset_name && m_attrs == m_attrs;
+        return m_type_name == other.m_type_name && m_opset_name == other.m_opset_name && m_attrs == other.m_attrs;
     }
 
 private:

ngraph/test/CMakeLists.txt

@@ -39,6 +39,7 @@ set(SRC
     eval.cpp
     file_util.cpp
     float16.cpp
+    framework_node.cpp
     function.cpp
     graph_rewrite.cpp
     includes.cpp

ngraph/test/framework_node.cpp

@@ -0,0 +1,43 @@
+// Copyright (C) 2021 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#include "ngraph/op/util/framework_node.hpp"
+
+#include <vector>
+
+#include "gtest/gtest.h"
+
+TEST(framework_node, attrs) {
+    ov::op::util::FrameworkNodeAttrs attrs;
+
+    attrs.set_opset_name("opset_name");
+    ASSERT_EQ(attrs.get_opset_name(), "opset_name");
+
+    attrs.set_type_name("type_name");
+    ASSERT_EQ(attrs.get_type_name(), "type_name");
+
+    attrs["attr1"] = "value1";
+    ASSERT_EQ(attrs.at("attr1"), "value1");
+    ASSERT_EQ(attrs.begin()->first, "attr1");
+    ASSERT_EQ(attrs.begin()->first, "attr1");
+    ASSERT_EQ(attrs.begin()->second, "value1");
+
+    ov::op::util::FrameworkNodeAttrs a1, a2;
+    a1.set_type_name("type_name");
+    a2.set_type_name("type_name_");
+    ASSERT_FALSE(a1 == a2);
+    a2.set_type_name("type_name");
+    ASSERT_TRUE(a1 == a2);
+    a1.set_opset_name("opset_name");
+    a2.set_opset_name("opset_name_");
+    ASSERT_FALSE(a1 == a2);
+    a2.set_opset_name("opset_name");
+    ASSERT_TRUE(a1 == a2);
+    a1["attr"] = "value";
+    ASSERT_FALSE(a1 == a2);
+    a2["attr"] = "value_";
+    ASSERT_FALSE(a1 == a2);
+    a2["attr"] = "value";
+    ASSERT_TRUE(a1 == a2);
+}