code: def __len__(self):
      return self.num_batches
  
file_path: DALI/docs/examples/use_cases/tensorflow/yolov4/src/np/pipeline.py
imports: from .coco import COCO
  import numpy
  import tensorflow
  import os
  import cv2
  import random
label_desc: Use image node_id 4 for calling the YOLOv4PipelineNumpy obj's underlying member method code with example usage: obj.__len__() and returns: self