Fix the transformers example when running with 4.57.0 #331
Description
Expected behavior
After the release of transformers 4.57.0, the CI related to transformers started failing. To temporarily resolve the issue, I opened a PR to add the version constraint. This issue proposes resolving the failure.
Environment
See https://github.com/optuna/optuna-examples/actions/runs/18260421197/job/51987583269
Error messages, stack traces, or logs
Traceback (most recent call last):
File "/home/runner/work/optuna-examples/optuna-examples/transformers/transformers_simple.py", line 17, in <module>
from transformers import Trainer
File "<frozen importlib._bootstrap>", line 1055, in _handle_fromlist
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/site-packages/transformers/utils/import_utils.py", line 2317, in __getattr__
module = self._get_module(self._class_to_module[name])
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/site-packages/transformers/utils/import_utils.py", line 2347, in _get_module
raise e
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/site-packages/transformers/utils/import_utils.py", line 2345, in _get_module
return importlib.import_module("." + module_name, self.__name__)
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/site-packages/transformers/trainer.py", line 311, in <module>
class Trainer:
File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/site-packages/transformers/trainer.py", line 5593, in Trainer
def _get_num_items_in_batch(self, batch_samples: list, device: torch.device) -> int | None:
TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'