code: def download_file(url, out_file):
      if not os.path.exists(out_file):
          urllib.request.urlretrieve(url, out_file)
      else:
          log.warning(
              "WARNING: skipping download of existing file " + out_file
          )
  
file_path: torch-points3d/scripts/cv_s3dis.py
imports: import os
  import hydra
  from omegaconf import OmegaConf
  import urllib.request
  import logging
  from torch_points3d.metrics.confusion_matrix import ConfusionMatrix
  import numpy
  from torch_points3d.trainer import Trainer
label_desc: Use image node_id 1 for calling a global function with example usage: download_file(url, out_file) without return types