Better error message from runtime::Manager.

src/ngraph/runtime/manager.cpp

@@ -91,7 +91,16 @@ Manager::FactoryMap& Manager::get_factory_map()
 std::shared_ptr<Manager> Manager::get(const std::string& name)
 {
     Manager::load_plugins(RUNTIME_PLUGIN_LIBS);
-    return get_factory_map().at(name)(name);
+
+    auto iter = get_factory_map().find(name);
+
+    if (iter == get_factory_map().end())
+    {
+        throw ngraph_error("No nGraph runtime with name '" + name + "' has been registered.");
+    }
+
+    Factory& f = iter->second;
+    return f(name);
 }
 
 Manager::Factory Manager::register_factory(const std::string& name, Factory factory)

test/CMakeLists.txt

@@ -36,6 +36,7 @@ set (SRC
     pass_liveness.cpp
     pass_manager.cpp
     pass_memory_layout.cpp
+    runtime_manager.cpp
     serialize.cpp
     pattern.cpp
     shape.cpp

test/runtime_manager.cpp

+// ----------------------------------------------------------------------------
+// Copyright 2018 Nervana Systems Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// ----------------------------------------------------------------------------
+
+#include "gtest/gtest.h"
+#include "ngraph/ngraph.hpp"
+
+using namespace std;
+
+TEST(runtime_manager, invalidName)
+{
+    ASSERT_THROW(ngraph::runtime::Manager::get("COMPLETELY-BOGUS-MANAGER-NAME"),
+                 ngraph::ngraph_error);
+}