Which part of the code is tracking feature?

[ziliHarvey]

I'm interested in the tracking feature you proposed for annotating sequential frames. However, I noticed there's a tracker.py and inside bounding_box_predictor.py. there's also a function predict_next_frame_bbox. So which one implements the tracking feature? Or what's the difference between them?

And I notice there's a paticle_filter.py but never used. Can you please help explaining it a little bit? Thanks!