code: def test_series_groupby(self):
      s = pdml.ModelSeries([1, 2, 1, 2], name="X")
      self.assertIsInstance(s, pdml.ModelSeries)
  
      grouped = s.groupby([1, 1, 1, 2])
      self.assertIsInstance(
          grouped, pdml.core.groupby.ModelSeriesGroupBy
      )
  
      gs = grouped.get_group(1)
      self.assertIsInstance(gs, pdml.ModelSeries)
      expected = pd.Series([1, 2, 1], index=[0, 1, 2], name="X")
      tm.assert_series_equal(gs, expected)
      self.assertEqual(gs.name, "X")
  
file_path: pandas-ml/pandas_ml/test/test_groupby.py
imports: import numpy
  import pandas
  import sklearn.datasets
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestModelSeriesGroupBy obj's underlying member method code with example usage: obj.test_series_groupby() without return types