enum {
	CCV_NNC_BACKEND_CPU_REF = 0x3d9883e5,	
CCV_NNC_BACKEND_CPU_OPT = 0x46deb194,	
CCV_NNC_BACKEND_GPU_CUDNN = 0x854b679a,	
CCV_NNC_BACKEND_GPU_REF = 0x5f19790a,
	CCV_NNC_BACKEND_COUNT = 4,
};