code: def __len__(self) -> int:
      return self.__nsamples
  
imports: import os
  import warnings
  from typing import Tuple, List
  import cv2
  import numpy
  import torch
  from torch.utils.data import Dataset
  from torchvision import transforms
  from ....yolov3.utils import prepare_image
label_desc: Use image node_id 2 for calling the LoadImagesAndLabels obj's underlying member method code with example usage: obj.__len__() and returns: self