RetinaNetPostProcess

This is the RetinaNetPostProcess model postprocessing class, which is inherited from the object detection postprocessing base class (ObjectPostProcessBase).

The Init(), DeInit(), and Process() APIs of ObjectPostProcessBase are reloaded. For details, see ObjectPostProcessBase. It also reloads the assignment operator "=".

In addition, it implements the std::shared_ptr<MxBase::RetinaNetPostProcess> GetObjectInstance() method to obtain the smart pointer instance of this class.