code: def _sigmoid(x):
      return 1.0 / (1.0 + np.exp(np.float64(-x)))
  
file_path: pytorch/caffe2/python/fakelowp/test_utils.py
imports: import sys
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: _sigmoid(x) and returns: unknown