class_docstr: Creates TFDS examples for the Detection track.
class_docstr_tok: ["Creates","TFDS","examples","for","the","Detection","track","."]
code: def start(self):
      if self._image_labels_filepath:
          self._image2labels = load_image_level_labels(
              self._image_labels_filepath
          )
      if self._box_labels_filepath:
          self._image2boxes = load_box_level_labels(
              self._box_labels_filepath
          )
      if self._hierarchy_filepath:
          self._hierarchy = load_class_hierarchy(
              self._hierarchy_filepath
          )
      if self._classes_filepath:
          class_descriptions = load_class_descriptions(
              self._classes_filepath
          )
          self._mid2int = {
              mid: i for i, (mid, _) in enumerate(class_descriptions)
          }
  
imports: import collections
  import csv
  import io
  import json
  import os
  from absl import logging
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
label_desc: Use image node_id 2 for calling the CreateDetectionExampleFn obj's underlying member method code with example usage: obj.start() without return types