code: def __next__(self):
      return [self.get_one() for _ in range(self.batch_size)]
  
imports: import cv2
  import functools
  import math
  import numpy
  import nvidia.dali
  import nvidia.dali.fn
  import nvidia.dali.types
  import os.path
  from nvidia.dali import Pipeline, pipeline_def
  from nvidia.dali.data_node import DataNode
  from test_utils import check_batch, get_dali_extra_path, as_array
  import PIL.Image
label_desc: Use image node_id 3 for calling the random_3d_loader obj's underlying member method code with example usage: obj.__next__() and returns: unknown