code: def convert_to_npy(npz_file):
      if not os.path.isfile(npz_file[:-3] + "npy"):
          a = np.load(npz_file)["data"]
          np.save(npz_file[:-3] + "npy", a)
  
file_path: medicaldetectiontoolkit/experiments/lidc_exp/pack_dataset.py
imports: import numpy
  from multiprocessing import Pool
  import os
  import subprocess
label_desc: Use image node_id 2 for calling a global function with example usage: convert_to_npy(npz_file) without return types