code: def __len__(self):
      return len(self.frame_ids)
  
file_path: ARKitScenes/threedod/benchmark_scripts/utils/tenFpsDataLoader.py
imports: import copy
  import cv2
  import glob
  import json
  import numpy
  import os
  from .box_utils import compute_box_3d, boxes_to_corners_3d, get_size
  from .rotation import convert_angle_axis_to_matrix3
  from .taxonomy import class_names, ARKitDatasetConfig
label_desc: Use image node_id 3 for calling the TenFpsDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: len