code: def get_sample(self, sample_idx, epoch_idx):
      if sample_idx >= self.size:
          raise StopIteration
      return self.files_map[sample_idx]
  
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 FilesDataSet obj's underlying member method code with example usage: obj.get_sample(sample_idx, epoch_idx) and returns: self