code: def setup(self):
      c_dtype, x_dtype = self.in_dtypes
  
      if 0 in self.c_shape or 0 in self.x_shape:
          self.skip_backward_test = True
          self.skip_double_backward_test = True
  
      if c_dtype == "float16" or x_dtype == "float16":
          self.check_forward_options.update(
              {"rtol": 1e-2, "atol": 1e-2}
          )
          self.check_backward_options.update(
              {"rtol": 1e-2, "atol": 1e-2}
          )
          self.check_double_backward_options.update(
              {"rtol": 1e-2, "atol": 1e-2}
          )
  
imports: import unittest
  import chainer
  from chainer import functions
  import numpy
  import pytest
  import chainerx
  from chainerx_tests import array_utils
  from chainerx_tests import dtype_utils
  from chainerx_tests import op_utils
label_desc: Use image node_id 1 for calling the TestLstm obj's underlying member method code with example usage: obj.setup() without return types