code: def __call__(self):
      self.get_whs()
      centers = self.calc_anchors()
      if self.verbose:
          self.print_result(centers)
      return centers
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import sys
  from ppdet.utils.logger import setup_logger
  from scipy.cluster.vq import kmeans
  import numpy
  from tqdm import tqdm
  from ppdet.utils.cli import ArgsParser
  from ppdet.utils.check import check_gpu, check_version, check_config
  from ppdet.core.workspace import load_config, merge_config
label_desc: Use image node_id 5 for calling the BaseAnchorCluster obj's underlying member method code with example usage: obj.__call__() and returns: centers