code: def test_group_var_large_inputs(self):
      prng = np.random.default_rng(2)
  
      out = np.array([[np.nan]], dtype=self.dtype)
      counts = np.array([0], dtype="int64")
      values = (prng.random(10**6) + 10**12).astype(self.dtype)
      values.shape = (10**6, 1)
      labels = np.zeros(10**6, dtype="intp")
  
      self.algo(out, counts, values, labels)
  
      assert counts[0] == 10**6
      tm.assert_almost_equal(out[0, 0], 1.0 / 12, rtol=0.5e-3)
  
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 1 for calling the TestGroupVarFloat64 obj's underlying member method code with example usage: obj.test_group_var_large_inputs() without return types