code: def test_group_var_generic_2d_all_finite(self):
      prng = np.random.default_rng(2)
  
      out = (np.nan * np.ones((5, 2))).astype(self.dtype)
      counts = np.zeros(5, dtype="int64")
      values = 10 * prng.random((10, 2)).astype(self.dtype)
      labels = np.tile(np.arange(5), (2,)).astype("intp")
  
      expected_out = (
          np.std(values.reshape(2, 5, 2), ddof=1, axis=0) ** 2
      )
      expected_counts = counts + 2
  
      self.algo(out, counts, values, labels)
      assert np.allclose(out, expected_out, self.rtol)
      tm.assert_numpy_array_equal(counts, expected_counts)
  
imports: import numpy
  import pytest
  from pandas._libs import groupby
  from pandas._libs.groupby import group_cumprod, group_cumsum, group_mean, group_sum, group_var
  from pandas.core.dtypes.common import ensure_platform_int
  from pandas import isna
  import pandas._testing
label_desc: Use image node_id 3 for calling the GroupVarTestMixin obj's underlying member method code with example usage: obj.test_group_var_generic_2d_all_finite() without return types