Reference for ultralytics/trackers/bot_sort.py

class BOTrack(STrack):
    shared_kalman = KalmanFilterXYWH()

    def __init__(self, tlwh, score, cls, feat=None, feat_history=50):
        """Initialize YOLOv8 object with temporal parameters, such as feature history, alpha and current features."""
        super().__init__(tlwh, score, cls)

        self.smooth_feat = None
        self.curr_feat = None
        if feat is not None:
            self.update_features(feat)
        self.features = deque([], maxlen=feat_history)
        self.alpha = 0.9

    def update_features(self, feat):
        """Update features vector and smooth it using exponential moving average."""
        feat /= np.linalg.norm(feat)
        self.curr_feat = feat
        if self.smooth_feat is None:
            self.smooth_feat = feat
        else:
            self.smooth_feat = self.alpha * self.smooth_feat + (1 - self.alpha) * feat
        self.features.append(feat)
        self.smooth_feat /= np.linalg.norm(self.smooth_feat)

    def predict(self):
        """Predicts the mean and covariance using Kalman filter."""
        mean_state = self.mean.copy()
        if self.state != TrackState.Tracked:
            mean_state[6] = 0
            mean_state[7] = 0

        self.mean, self.covariance = self.kalman_filter.predict(mean_state, self.covariance)

    def re_activate(self, new_track, frame_id, new_id=False):
        """Reactivates a track with updated features and optionally assigns a new ID."""
        if new_track.curr_feat is not None:
            self.update_features(new_track.curr_feat)
        super().re_activate(new_track, frame_id, new_id)

    def update(self, new_track, frame_id):
        """Update the YOLOv8 instance with new track and frame ID."""
        if new_track.curr_feat is not None:
            self.update_features(new_track.curr_feat)
        super().update(new_track, frame_id)

    @property
    def tlwh(self):
        """Get current position in bounding box format `(top left x, top left y,
        width, height)`.
        """
        if self.mean is None:
            return self._tlwh.copy()
        ret = self.mean[:4].copy()
        ret[:2] -= ret[2:] / 2
        return ret

    @staticmethod
    def multi_predict(stracks):
        """Predicts the mean and covariance of multiple object tracks using shared Kalman filter."""
        if len(stracks) <= 0:
            return
        multi_mean = np.asarray([st.mean.copy() for st in stracks])
        multi_covariance = np.asarray([st.covariance for st in stracks])
        for i, st in enumerate(stracks):
            if st.state != TrackState.Tracked:
                multi_mean[i][6] = 0
                multi_mean[i][7] = 0
        multi_mean, multi_covariance = BOTrack.shared_kalman.multi_predict(multi_mean, multi_covariance)
        for i, (mean, cov) in enumerate(zip(multi_mean, multi_covariance)):
            stracks[i].mean = mean
            stracks[i].covariance = cov

    def convert_coords(self, tlwh):
        """Converts Top-Left-Width-Height bounding box coordinates to X-Y-Width-Height format."""
        return self.tlwh_to_xywh(tlwh)

    @staticmethod
    def tlwh_to_xywh(tlwh):
        """Convert bounding box to format `(center x, center y, width,
        height)`.
        """
        ret = np.asarray(tlwh).copy()
        ret[:2] += ret[2:] / 2
        return ret

class BOTSORT(BYTETracker):

    def __init__(self, args, frame_rate=30):
        """Initialize YOLOv8 object with ReID module and GMC algorithm."""
        super().__init__(args, frame_rate)
        # ReID module
        self.proximity_thresh = args.proximity_thresh
        self.appearance_thresh = args.appearance_thresh

        if args.with_reid:
            # Haven't supported BoT-SORT(reid) yet
            self.encoder = None
        self.gmc = GMC(method=args.gmc_method)

    def get_kalmanfilter(self):
        """Returns an instance of KalmanFilterXYWH for object tracking."""
        return KalmanFilterXYWH()

    def init_track(self, dets, scores, cls, img=None):
        """Initialize track with detections, scores, and classes."""
        if len(dets) == 0:
            return []
        if self.args.with_reid and self.encoder is not None:
            features_keep = self.encoder.inference(img, dets)
            return [BOTrack(xyxy, s, c, f) for (xyxy, s, c, f) in zip(dets, scores, cls, features_keep)]  # detections
        else:
            return [BOTrack(xyxy, s, c) for (xyxy, s, c) in zip(dets, scores, cls)]  # detections

    def get_dists(self, tracks, detections):
        """Get distances between tracks and detections using IoU and (optionally) ReID embeddings."""
        dists = matching.iou_distance(tracks, detections)
        dists_mask = (dists > self.proximity_thresh)

        # TODO: mot20
        # if not self.args.mot20:
        dists = matching.fuse_score(dists, detections)

        if self.args.with_reid and self.encoder is not None:
            emb_dists = matching.embedding_distance(tracks, detections) / 2.0
            emb_dists[emb_dists > self.appearance_thresh] = 1.0
            emb_dists[dists_mask] = 1.0
            dists = np.minimum(dists, emb_dists)
        return dists

    def multi_predict(self, tracks):
        """Predict and track multiple objects with YOLOv8 model."""
        BOTrack.multi_predict(tracks)