def to_tlwh(self):
        """Get position in format `(top left x, top left y, width, height)`."""
        ret = self.mean[:4].copy()
        ret[2] *= ret[3]
        ret[:2] -= ret[2:] / 2
        return ret
Get position in format `(top left x, top left y, width, height)`.
deploy/pptracking/python/mot/tracker/base_sde_tracker.py