code: def read_file(self, file_path):
      return np.fromfile(file_path, dtype=np.uint8)
  
imports: import argparse
  import cv2
  import numpy
  import nvidia.dali
  import nvidia.dali.types
  import os
label_desc: Use image node_id 4 for calling the SampleLoader obj's underlying member method code with example usage: obj.read_file(file_path) and returns: np