code: def sigmoid(x):
      return 0.5 * (np.tanh(x) + 1)
  
file_path: autograd/examples/logistic_regression.py
imports: from __future__ import absolute_import
  from __future__ import print_function
  from builtins import range
  import autograd.numpy
  from autograd import grad
  from autograd.test_util import check_grads
label_desc: Use image node_id 1 for calling a global function with example usage: sigmoid(x) and returns: unknown