code: def annotations(self):
      if self._annotations is None:
          self._annotations = []
          for annotation_id in self.annotated_files:
              annotation = self._read_annotation(
                  self._get_annotation_path(annotation_id)
              )
              annotation["image_id"] = annotation_id
              self._annotations.append(annotation)
      return self._annotations
  
file_path: luminoth/luminoth/tools/dataset/readers/object_detection/flat_reader.py
imports: import json
  import os
  import six
  import tensorflow
  from PIL import Image
  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 6 for calling the FlatReader obj's underlying member method code with example usage: obj.annotations() and returns: self