code: def check_reset_state(self):
      self.link.reset_state()
      self.assertIsNone(self.link.h)
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 5 for calling the TestGRUState obj's underlying member method code with example usage: obj.check_reset_state() without return types