code: def test_frac_2_3(self):
      self.generate(
          "test_frac_2_3",
          "test_lowess_frac.csv",
          out="out_2_3",
          kwargs={"frac": 2.0 / 3},
      )
  
imports: import os
  import numpy
  from numpy.testing import assert_, assert_allclose, assert_almost_equal, assert_equal, assert_raises
  import pytest
  from statsmodels.nonparametric.smoothers_lowess import lowess
  import pandas
label_desc: Use image node_id 8 for calling the TestLowess obj's underlying member method code with example usage: obj.test_frac_2_3() without return types