code: def setup_class(cls):
      np.random.seed(0)
      cls.omega_model = OaxacaBlinder(
          pandas_df.endog, pandas_df.exog, "OWNRENT", hasconst=False
      ).two_fold(True, two_fold_type="nuemark")
  
imports: import numpy
  from statsmodels.datasets.ccard.data import load_pandas
  from statsmodels.stats.oaxaca import OaxacaBlinder
  from statsmodels.tools.tools import add_constant
label_desc: Use image node_id 1 for calling the TestOmegaModel obj's underlying member method code with example usage: obj.setup_class(cls) without return types