Spconv Engine Implementation

[barrydoooit]

Hi @hopef !

I found a huge gap of inference latency on orin of BEVFusion's lidar-scn backbone, between using the engine returned by spconv::load_engine_from_onnx(30ms) and using the original pytorch implementation(100ms). Therefore I want to check how is that spconv engine handling the forward process and I wonder where may we get the implementation of that Spconv Engine class (defined in engine.hpp?

I suppose it's in the libspconv, but I got no clue of existence of this class from traveller59's spconv repo. Is it implemented additionally along with this Lidar_AI_Solution project and would not be released? Looking forward to your reply.