code: def string_2_numpy(input_string, return_all=False):
      if return_all:
          return input_string, None, None
      else:
          return input_string
  
imports: import os
  import numpy
  import nibabel
  import nrrd
  import pydicom
  import subprocess
  from collections import defaultdict
  from imageio import imwrite, imread
  from deepneuro.utilities.util import grab_files_recursive, quotes
label_desc: Use image node_id 13 for calling a global function with example usage: string_2_numpy(input_string, return_all) and returns: input_string,  None,  None, input_string