code: def test_batched_inv(self, dtype):
      for xp in (numpy, cupy):
          a = xp.array([[[1, 2], [2, 4]]]).astype(dtype)
          assert a.ndim >= 3  # CuPy internally uses a batched function.
          with cupyx.errstate(linalg="raise"):
              with pytest.raises(numpy.linalg.LinAlgError):
                  xp.linalg.inv(a)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.testing import _condition
  import cupyx
  from cupy.cublas import get_batched_gesv_limit, set_batched_gesv_limit
label_desc: Use image node_id 2 for calling the TestInvInvalid obj's underlying member method code with example usage: obj.test_batched_inv(dtype) without return types