code: def save_pickle(fname, dix):
      """Save `dix` to `fname` as pickle.
  
      Parameters
      ----------
      fname : str
         filename to save object e.g. a dictionary
      dix : str
         dictionary or other object
  
      Examples
      --------
      >>> import os
      >>> from tempfile import mkstemp
      >>> fd, fname = mkstemp() # make temporary file (opened, attached to fh)
      >>> d={0:{'d':1}}
      >>> save_pickle(fname, d)
      >>> d2=load_pickle(fname)
  
      We remove the temporary file we created for neatness
  
      >>> os.close(fd) # the file is still open, we need to close the fh
      >>> os.remove(fname)
  
      See Also
      --------
      dipy.io.pickles.load_pickle
  
      """
      out = open(fname, "wb")
      pickle.dump(dix, out, protocol=pickle.HIGHEST_PROTOCOL)
      out.close()
  
label_desc: Use image node_id 1 for calling a global function with example usage: save_pickle(fname, dix) without return types