code: def forward_expected(self, inputs):
      (x,) = inputs
      function = getattr(numpy, self.function_name)
      expected = function(x)
      expected = utils.force_array(expected)
      return (expected,)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_exponential.py
imports: import numpy
  from chainer import functions
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 4 for calling the TestLog obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: expected