code: def sigmoid(x):
      return 1 / (1 + np.exp(-x))
  
file_path: tffm/tffm/utils.py
imports: import math
  import numpy
  import tensorflow
  import itertools
  from itertools import combinations_with_replacement, takewhile, count
  from collections import defaultdict
label_desc: Use image node_id 8 for calling a global function with example usage: sigmoid(x) and returns: unknown