strip off attributes from backend type prior to shared lib dlopen (#1080)

* strip off attributes from backend type prior to shared lib dlopen

src/ngraph/runtime/backend.cpp

@@ -40,20 +40,28 @@ runtime::Backend::~Backend()
 {
 }
 
-void* runtime::Backend::open_shared_library(const string& type)
+void* runtime::Backend::open_shared_library(string type)
 {
     string ext = SHARED_LIB_EXT;
     string ver = LIBRARY_VERSION;
 
     void* handle = nullptr;
+
+    // strip off attributes, IE:CPU becomes IE
+    auto colon = type.find(":");
+    if (colon != type.npos)
+    {
+        type = type.substr(0, colon);
+    }
     string name = "lib" + to_lower(type) + "_backend" + ext;
     handle = dlopen(name.c_str(), RTLD_NOW | RTLD_GLOBAL);
     if (handle)
     {
-        function<void()> create = reinterpret_cast<void (*)()>(dlsym(handle, "create_backend"));
-        if (create)
+        function<void()> create_backend =
+            reinterpret_cast<void (*)()>(dlsym(handle, "create_backend"));
+        if (create_backend)
         {
-            create();
+            create_backend();
         }
         else
         {

src/ngraph/runtime/backend.hpp

@@ -83,7 +83,7 @@ namespace ngraph
                                const std::vector<std::shared_ptr<runtime::TensorView>>& inputs);
 
         private:
-            static void* open_shared_library(const std::string& name);
+            static void* open_shared_library(std::string type);
             static std::unordered_map<std::string, std::shared_ptr<Backend>>& get_backend_map();
         };
     }