code: def test_split_metafeature_array(self):
      (
          ds_metafeatures,
          other_metafeatures,
      ) = self.meta_optimizer._split_metafeature_array()
      self.assertIsInstance(ds_metafeatures, pd.Series)
      self.assertEqual(ds_metafeatures.shape, (46,))
      self.assertIsInstance(other_metafeatures, pd.DataFrame)
      self.assertEqual(other_metafeatures.shape, (131, 46))
  
file_path: auto-sklearn/test/test_metalearning/pyMetaLearn/test_metalearner.py
imports: import logging
  import os
  import numpy
  import pandas
  from ConfigSpace.configuration_space import Configuration
  import autosklearn.metalearning.optimizers.metalearn_optimizer.metalearner
  import autosklearn.pipeline.classification
  from autosklearn.metalearning.metalearning.meta_base import MetaBase
  import unittest
label_desc: Use image node_id 7 for calling the MetaLearnerTest obj's underlying member method code with example usage: obj.test_split_metafeature_array() without return types