code: def setUp(self):
      if self.dtype == numpy.float16:
          self.check_forward_options = {"atol": 1e-3, "rtol": 1e-2}
          self.check_backward_options = {"atol": 5e-3, "rtol": 5e-2}
          self.check_double_backward_options = {
              "atol": 5e-3,
              "rtol": 5e-2,
          }
  
imports: import unittest
  import numpy
  import six
  from chainer.backends import cuda
  from chainer import functions
  from chainer.functions.rnn import slstm
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import backend
label_desc: Use image node_id 1 for calling the TestSLSTM obj's underlying member method code with example usage: obj.setUp() without return types