code: def test_cached_values_evaluated(self):
      # check that value-like attributes are evaluated before data
      # is removed
      res = self.results
      assert res._cache == {}
      res.remove_data()
      assert "aic" in res._cache
  
imports: from statsmodels.compat.pandas import assert_series_equal
  from io import BytesIO
  import pickle
  import numpy
  import pandas
  import statsmodels.api
label_desc: Use image node_id 3 for calling the TestRemoveDataPickleGLM obj's underlying member method code with example usage: obj.test_cached_values_evaluated() without return types