code: def forward(self, inputs, device):
      (x,) = inputs
      function = getattr(functions, self.function_name)
      return (function(x),)
  
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 3 for calling the TestLog obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: function