docstr: return metrics {
           'acc': 0
      }
docstr_tok: ["return","metrics","{","'acc","'",":","0","}"]
code: def get_metric(self):
      """
      return metrics {
               'acc': 0
          }
      """
      acc = self.correct_num / (self.all_num + self.eps)
      self.reset()
      return {"acc": acc}
  
label_desc: Use image node_id 3 for calling the ClsMetric obj's underlying member method code with example usage: obj.get_metric() and returns: dict