code: def mark_removed(self):
      self.state = TrackState.Removed
  
imports: import numpy
  from collections import deque, OrderedDict
  from ..matching import jde_matching
  from ppdet.core.workspace import register, serializable
label_desc: Use image node_id 7 for calling the BaseTrack obj's underlying member method code with example usage: obj.mark_removed() without return types