Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/Users/user/.pyenv/versions/flatten-obs/lib/python3.6/site-packages/cupy/creation/from_data.py", line 46, in asarray

return core.array(a, dtype, False)


 "cupy/core/core.pyx", line 1799, in cupy.core.core.array (cupy/core/core.cpp:58790)


 "cupy/core/core.pyx", line 1824, in cupy.core.core.array (cupy/core/core.cpp:58526)
ValueError: Unsupported dtype object

Traceback (most recent call last):


 "optuna_debug.py", line 11, in <module>

print(study.best_trial)


 "/home/david/envs/optuna/lib/python3.8/site-packages/optuna/study.py", line 72, in best_trial

return copy.deepcopy(self._storage.get_best_trial(self._study_id))


 "/home/david/envs/optuna/lib/python3.8/site-packages/optuna/storages/_cached_storage.py", line 264, in get_best_trial

return self._backend.get_best_trial(study_id)


 "/home/david/envs/optuna/lib/python3.8/site-packages/optuna/storages/_rdb/storage.py", line 1035, in get_best_trial

trial = models.TrialModel.find_min_value_trial(study_id, session)


 "/home/david/envs/optuna/lib/python3.8/site-packages/optuna/storages/_rdb/models.py", line 216, in find_min_value_trial

raise ValueError(NOT_FOUND_MSG)
ValueError: Record does not exist.
