code: def test_split_stratify(self):
      self.pipeline = tests.mocks.pipelines.Users()
      self.pipeline.stratify = "last_name"
  
      data = pandas.concat(
          [chunk for chunk in self.pipeline.training_data]
      )
      self.assertTrue(len(data["last_name"].drop_duplicates()), 80)
  
      data = pandas.concat(
          [chunk for chunk in self.pipeline.validation_data]
      )
      self.assertTrue(len(data["last_name"].drop_duplicates()), 10)
  
      data = pandas.concat([chunk for chunk in self.pipeline.test_data])
      self.assertTrue(len(data["last_name"].drop_duplicates()), 10)
  
file_path: lore/tests/unit/test_pipelines.py
imports: from __future__ import generators
  import unittest
  import pandas
  import tests.mocks.pipelines
label_desc: Use image node_id 5 for calling the TestLowMemory obj's underlying member method code with example usage: obj.test_split_stratify() without return types