code: def sigmoid(x):
      # Sigmoid "squashing" function to interval [0, 1].
      return 1.0 / (1.0 + np.exp(-x))
  
file_path: analytics-zoo/pyzoo/zoo/examples/ray_on_spark/rl_pong/rl_pong.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import argparse
  import os
  import time
  import gym
  import numpy
  import ray
  from zoo.orca import init_orca_context, stop_orca_context
  from zoo.orca import OrcaContext
label_desc: Use image node_id 1 for calling a global function with example usage: sigmoid(x) and returns: unknown