code: def get_metric(self):
      structure_metric = self.structure_metric.get_metric()
      if self.bbox_metric is None:
          return structure_metric
      bbox_metric = self.bbox_metric.get_metric()
      if self.main_indicator == self.bbox_metric.main_indicator:
          output = bbox_metric
          for sub_key in structure_metric:
              output[
                  "structure_metric_{}".format(sub_key)
              ] = structure_metric[sub_key]
      else:
          output = structure_metric
          for sub_key in bbox_metric:
              output["bbox_metric_{}".format(sub_key)] = bbox_metric[
                  sub_key
              ]
      return output
  
file_path: PaddleOCR/ppocr/metrics/table_metric.py
imports: import numpy
  from ppocr.metrics.det_metric import DetMetric
label_desc: Use image node_id 4 for calling the TableMetric obj's underlying member method code with example usage: obj.get_metric() and returns: output, structure_metric