code: def tanh(x):
      return (1.0 - np.exp(-x)) / (1.0 + np.exp(-x))
  
imports: from __future__ import absolute_import
  import autograd.numpy
  import matplotlib.pyplot
  from autograd import elementwise_grad
label_desc: Use image node_id 1 for calling a global function with example usage: tanh(x) and returns: unknown