code: def test_log():
      fun = lambda x: 3.0 * np.log(x)
      check_grads(fun)(abs(npr.randn()))
  
imports: from __future__ import absolute_import
  import autograd.numpy
  import autograd.numpy.random
  from autograd.test_util import check_grads
  from autograd import grad
label_desc: Use image node_id 5 for calling a global function with example usage: test_log() without return types