code: def _load_timestamps(self):
          
          timestamp_file = os.path.join(
              self.data_path, 'oxts', 'timestamps.txt')
  
          # Read and parse the timestamps
          self.timestamps = []
          with open(timestamp_file, 'r') as f:
              for line in f.readlines():
                  # NB: datetime only supports microseconds, but KITTI timestamps
                  # give nanoseconds, so need to truncate last 4 characters to
                  # get rid of \n (counts as 1) and extra 3 digits
                  t = dt.datetime.strptime(line[:-4], '%Y-%m-%d %H:%M:%S.%f')
                  self.timestamps.append(t)
  
          # Subselect the chosen range of frames, if any
          if self.frames is not None:
              self.timestamps = [self.timestamps[i] for i in self.frames]
docs: Load timestamps from file.