TPE resume test is not working. When enabled, it FAILED randomly.

[aramoto99]

The contents of the TPE resume test are presumed to be the same as the resume test of the Random search.
https://github.com/aistairc/aiaccel/blob/main/tests/resumption/sphere/test_sphere_tpe_resumption.py

To test the TPE, I made the following changes

class TestSphereRandomResumption(ResumptionTest):

    @classmethod
    def setup_class(cls):
        cls.search_algorithm = aiaccel.search_algorithm_tpe

And,

pytest -s -v tests/resumption/sphere/test_sphere_tpe_resumption.py

The result is sometimes success, sometimes failure.

Error message

FAILED tests/resumption/sphere/test_sphere_tpe_resumption.py::TestSphereRandomResumption::test_run - FileNotFoundError: [Errno 2] No such file or directory: '/tmp/work/result/final_result.result'

I guess, #21 is not fixed completly.

This phenomenon can be reproduced (in some cases) in the current main branch by following the above procedure.

[aramoto99]

This issue has been resolved with the integration of the database version.
#45