code: def setUp(self):
      self.ml_100k = cornac.datasets.movielens.load_feedback()
      cutoff = int(
          len(self.ml_100k) * 0.1
      )  # use 10% for faster testing
      self.ml_100k = self.ml_100k[:cutoff]
  
file_path: cornac/tests/cornac/eval_methods/test_propensity_stratified_evaluation.py
imports: import unittest
  import numpy
  import cornac
  from cornac.data import Reader
  from cornac.eval_methods import PropensityStratifiedEvaluation
  from cornac.models import MF
  from cornac.metrics import MAE, AUC
label_desc: Use image node_id 1 for calling the TestPropensityStratifiedEvaluation obj's underlying member method code with example usage: obj.setUp() without return types