code: def forward_xp(self, inputs, xp):
      (a,) = inputs
      if xp is chainerx:
          a_ = a.as_grad_stopped().copy()
      else:
          a_ = a.copy()
      with IgnoreNumpyFloatingPointError():
          ret = self.func(xp, a_)
      assert ret is None  # func should not return anything
      return (a_,)
  
imports: import unittest
  import numpy
  import chainerx
  from chainerx_tests import array_utils
  from chainerx_tests import dtype_utils
label_desc: Use image node_id 1 for calling the InplaceUnaryMathTestBase obj's underlying member method code with example usage: obj.forward_xp(inputs, xp) and returns: a_