code: def setUp(self):
      self.data = Reader().read("./tests/data.txt")
      self.n_folds = 5
      self.cv = CrossValidation(
          data=self.data, n_folds=self.n_folds, exclude_unknowns=False
      )
  
file_path: cornac/tests/cornac/eval_methods/test_cross_validation.py
imports: import unittest
  import numpy
  from cornac.eval_methods import CrossValidation
  from cornac.data import Reader
label_desc: Use image node_id 1 for calling the TestCrossValidation obj's underlying member method code with example usage: obj.setUp() without return types