some problems about high_thresh

the code in bytetrack-opencv-onnxruntime/onnxruntime/cpp/src/BYTETracker.cpp script
                if (track->score < this->high_thresh)
                        continue;
low score dets in the first frame will not use. is it right? 
if so, is it necessary to Add a restriction, such as track->frame_id
Maybe I misunderstood it. Hope your reply.
have a nice day.