class_docstr: A single target track with state space `(x, y, a, h)` and associated
  velocities, where `(x, y)` is the center of the bounding box, `a` is the
  aspect ratio and `h` is the height.
  
  Args:
      mean (ndarray): Mean vector of the initial state distribution.
      covariance (ndarray): Covariance matrix of the initial state distribution.
      track_id (int): A unique track identifier.
      n_init (int): Number of consecutive detections before the track is confirmed.
          The track state is set to `Deleted` if a miss occurs within the first
          `n_init` frames.
      max_age (int): The maximum number of consecutive misses before the track
          state is set to `Deleted`.
      cls_id (int): The category id of the tracked box.
      score (float): The confidence score of the tracked box.
      feature (Optional[ndarray]): Feature vector of the detection this track
          originates from. If not None, this feature is added to the `features` cache.
  
  Attributes:
      hits (int): Total number of measurement updates.
      age (int): Total number of frames since first occurance.
      time_since_update (int): Total number of frames since last measurement
          update.
      state (TrackState): The current track state.
      features (List[ndarray]): A cache of features. On each measurement update,
          the associated feature vector is added to this list.
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docstr: Mark this track as missed (no association at the current time step).
          
docstr_tok: ["Mark","this","track","as","missed","(","no","association","at","the","current","time","step",")","."]
code: def mark_missed(self):
      """Mark this track as missed (no association at the current time step)."""
      if self.state == TrackState.Tentative:
          self.state = TrackState.Deleted
      elif self.time_since_update > self._max_age:
          self.state = TrackState.Deleted
  
file_path: PaddleDetection/deploy/pptracking/python/mot/tracker/base_sde_tracker.py
imports: import datetime
label_desc: Use image node_id 6 for calling the Track obj's underlying member method code with example usage: obj.mark_missed() without return types