https://github.com/nwojke/deep_sort
Then, download pre-generated detections and the CNN checkpoint file from here(https://drive.google.com/open?id=18fKzfqnqhqW3s9zwsCbnVJ5XF2JFeqMp).
包含：
mars-small128.ckpt-68577
mars-small128.ckpt-68577.meta
mars-sma
