code: def clear(str):
      # replace all non alpha-numeric characters with spaces
      return re.sub(r"[^a-zA-Z0-9 ]", " ", str)
  
file_path: nmslib/previous_releases_scripts/genplot.py
imports: import argparse
  import os
  import re
  import sys
  import itertools
  import re
  from subprocess import call
label_desc: Use image node_id 2 for calling a global function with example usage: clear(str) and returns: re