code: def get_total(self):
      return self._total_records
  
file_path: luminoth/luminoth/tools/dataset/readers/object_detection/coco.py
imports: import json
  import os
  import tensorflow
  from luminoth.tools.dataset.readers import InvalidDataDirectory
  from luminoth.tools.dataset.readers.object_detection import ObjectDetectionReader
  from luminoth.utils.dataset import read_image
label_desc: Use image node_id 2 for calling the COCOReader obj's underlying member method code with example usage: obj.get_total() and returns: self