A backend property request (#2281)

* A backend property request

* Update backend.hpp

* PR2281. Add get property function to CPU backend

* Update backend.hpp

src/ngraph/runtime/backend.hpp

@@ -124,6 +124,16 @@ public:
     /// \returns true if the op is supported, false otherwise.
     virtual bool is_supported(const Node& node) const;
 
+    /// \brief A set of properties supported by a backend
+    enum class Property
+    {
+        memory_attach /// New tensor can use attached memory
+    };
+
+    /// \brief Test if a backend particular property is supported
+    /// \param prop is the feature to test.
+    /// \returns true if the property is supported, false otherwise.
+    virtual bool is_supported_property(const Property prop) const { return false; }
     void validate(std::shared_ptr<const Function> func,
                   const std::vector<std::shared_ptr<runtime::Tensor>>& outputs,
                   const std::vector<std::shared_ptr<runtime::Tensor>>& inputs);

src/ngraph/runtime/cpu/cpu_backend.cpp

@@ -150,3 +150,13 @@ bool runtime::cpu::CPU_Backend::is_supported(const Node& op) const
 {
     return true;
 }
+
+bool runtime::cpu::CPU_Backend::is_supported_property(const Property prop) const
+{
+    if (prop == Property::memory_attach)
+    {
+        return true;
+    }
+
+    return false;
+}

src/ngraph/runtime/cpu/cpu_backend.hpp

@@ -59,6 +59,7 @@ namespace ngraph
                     get_performance_data(std::shared_ptr<Function> func) const override;
 
                 bool is_supported(const Node& node) const override;
+                bool is_supported_property(const Property prop) const override;
 
             private:
                 class FunctionInstance

src/ngraph/runtime/intelgpu/intelgpu_backend.cpp

@@ -2106,3 +2106,13 @@ void runtime::intelgpu::IntelGPUBackend::print_call_performance(
 
     cout.flags(saved_stream_flags); // Restore stream configuration to leave it in original state
 }
+
+bool runtime::intelgpu::IntelGPUBackend::is_supported_property(const Property prop) const
+{
+    if (prop == Property::memory_attach)
+    {
+        return true;
+    }
+
+    return false;
+}

src/ngraph/runtime/intelgpu/intelgpu_backend.hpp

@@ -58,6 +58,8 @@ public:
     std::vector<PerformanceCounter>
         get_performance_data(std::shared_ptr<Function> func) const override;
 
+    bool is_supported_property(const Property prop) const override;
+
 private:
     class FunctionInstance
     {