code: def init_track(self, results):
      print("Initialize tracking!")
      for item in results:
          if item["score"] > self.new_thresh:
              self.id_count += 1
              item["tracking_id"] = self.id_count
              if not ("ct" in item):
                  bbox = item["bbox"]
                  item["ct"] = [
                      (bbox[0] + bbox[2]) / 2,
                      (bbox[1] + bbox[3]) / 2,
                  ]
              self.tracks.append(item)
  
file_path: PaddleDetection/ppdet/modeling/mot/tracker/center_tracker.py
imports: import copy
  import numpy
  import sklearn
  from ppdet.core.workspace import register, serializable
  from ppdet.utils.logger import setup_logger
label_desc: Use image node_id 2 for calling the CenterTracker obj's underlying member method code with example usage: obj.init_track(results) without return types