code: def combine_results(self, results):
      node = np.concatenate(self.node, 0)
      gts = np.concatenate(self.gt, 0)
      results = self.compute_f1_score(node, gts)
      data = {"hmean": results.mean()}
      return data
  
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 4 for calling the KIEMetric obj's underlying member method code with example usage: obj.combine_results(results) and returns: data