code: def _hard_sigmoid(x):
      return (x * 0.2 + 0.5).clip(0, 1)
  
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 1 for calling a global function with example usage: _hard_sigmoid(x) and returns: unknown