Test max_positions

                train_translation_model(data_dir, 'fconv_iwslt_de_en', ['--update-freq', '3'])

                generate_main(data_dir)

    def test_max_positions(self):

        with contextlib.redirect_stdout(StringIO()):

            with tempfile.TemporaryDirectory('test_max_positions') as data_dir:

                create_dummy_data(data_dir)

                preprocess_translation_data(data_dir)

                with self.assertRaises(Exception) as context:

                    train_translation_model(

                        data_dir, 'fconv_iwslt_de_en', ['--max-target-positions', '5'],

                    )

                self.assertTrue(

                    'skip this example with --skip-invalid-size-inputs-valid-test' \

                    in str(context.exception)

                )

                train_translation_model(

                    data_dir, 'fconv_iwslt_de_en',

                    ['--max-target-positions', '5', '--skip-invalid-size-inputs-valid-test'],

                )

                with self.assertRaises(Exception) as context:

                    generate_main(data_dir)

                generate_main(data_dir, ['--skip-invalid-size-inputs-valid-test'])

    def test_generation(self):

        with contextlib.redirect_stdout(StringIO()):

            with tempfile.TemporaryDirectory('test_sampling') as data_dir: