code: def forward_expected(self, inputs):
      (x,) = inputs
      y = utils.force_array(_hard_sigmoid(x), self.dtype)
      return (y,)
  
file_path: chainer/tests/chainer_tests/functions_tests/activation_tests/test_hard_sigmoid.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 TestHardSigmoid obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: y