code: def mod5_shift(trainer):
      return trainer.updater.iteration % 5
  
file_path: chainercv/tests/chainer_experimental_tests/training_tests/extensions_tests/test_make_shift.py
imports: import mock
  import unittest
  from chainer import testing
  from chainercv.chainer_experimental.training.extensions import make_shift
label_desc: Use image node_id 1 for calling a global function with example usage: mod5_shift(trainer) and returns: unknown