code: def forward_xp(self, inputs, xp):
      (a,) = inputs
      # This cast was introduced in order to avoid decreasing precision.
      # ex.) numpy.sqrt(x) becomes a float16 array where x is an int8 array.
      a = dtype_utils.cast_if_numpy_array(xp, a, self.out_dtype)
      with IgnoreNumpyFloatingPointError():
          y = self.func(xp, a)
      y = dtype_utils.cast_if_numpy_array(xp, y, self.out_dtype)
      return (y,)
  
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 3 for calling the UnaryMathTestBase obj's underlying member method code with example usage: obj.forward_xp(inputs, xp) and returns: y