code: def test_as_series_2dim(self, xp, dtype):
      a = testing.shaped_random((4, 5), xp, dtype)
      return xp.polynomial.polyutils.as_series(a, trim=self.trim)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 5 for calling the TestAsSeries obj's underlying member method code with example usage: obj.test_as_series_2dim(xp, dtype) and returns: xp