code: def get_metric(self):
      metrics = self.combine_results(self.results)
      self.reset()
      return metrics
  
file_path: PaddleOCR/ppocr/metrics/kie_metric.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import paddle
label_desc: Use image node_id 5 for calling the KIEMetric obj's underlying member method code with example usage: obj.get_metric() and returns: metrics