code: def is_file(path):
      return callZooFunc("float", "isFile", path)
  
imports: import functools
  import glob
  import os
  import subprocess
  import tempfile
  import uuid
  from urllib.parse import urlparse
  import numpy
  from bigdl.dllib.utils.common import Sample, JTensor, JavaCreator, _get_gateway, _py2java, _java2py
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 7 for calling a global function with example usage: is_file(path) and returns: callZooFunc