code: def is_path(s):
      return os.path.exists(s)
  
file_path: FATE/python/fate/components/components/homo_nn.py
imports: import logging
  import os
  from fate.arch import Context
  from fate.components.components.nn.nn_runner import NNRunner
  from fate.components.components.nn.component_utils import prepare_runner_class, prepare_context_and_role, train_procedure, predict_procedure
  from fate.components.components.utils import consts
  from fate.components.core import ARBITER, GUEST, HOST, Role, cpn
label_desc: Use image node_id 1 for calling a global function with example usage: is_path(s) and returns: os