code: def set_prefix(prefix):
      """Set the prefix assigned to temporary directories during estimation.
  
      Parameters
      ----------
      prefix : str
          cache file name prefix
      """
      global _PREFIX
      _PREFIX = prefix
  
imports: from __future__ import print_function
  import os
  import sys
  import shutil
  import tempfile
  import warnings
  import sysconfig
  import subprocess
  from multiprocessing import current_process
  import numpy
label_desc: Use image node_id 8 for calling a global function with example usage: set_prefix(prefix) without return types