code: def __iter__(self):
      for test_mask in self._test_masks():
          yield 1 - test_mask, test_mask
  
file_path: h2o-3/h2o-py/h2o/cross_validation.py
imports: from h2o.utils.compatibility import *
label_desc: Use image node_id 2 for calling the H2OPartitionIterator obj's underlying member method code with example usage: obj.__iter__() without return types