Traceback (most recent call last):


 "numbaTest.py", line 130, in <module>

main()


 "numbaTest.py", line 90, in main

Cs_occs = pool1.map(partial(for2, swap_out_set=swap_out_set, n=n, reference_C=reference_C, reference_occ=reference_occ), swap_list)


 "/usr/lib/python2.7/multiprocessing/pool.py", line 253, in map

return self.map_async(func, iterable, chunksize).get()


 "/usr/lib/python2.7/multiprocessing/pool.py", line 572, in get

raise self._value
ValueError: cannot compute fingerprint of empty list

Traceback (most recent call last):


 "/usr/local/lib/python3.6/dist-packages/optuna/study.py", line 709, in _run_trial

result = func(trial)


 "/usr/local/lib/python3.6/dist-packages/optuna/integration/_lightgbm_tuner/optimize.py", line 302, in __call__

cv_results = lgb.cv(self.lgbm_params, self.train_set, **self.lgbm_kwargs)


 "/usr/local/lib/python3.6/dist-packages/lightgbm/engine.py", line 576, in cv

evaluation_result_list=res))


 "/usr/local/lib/python3.6/dist-packages/lightgbm/callback.py", line 221, in _callback

_init(env)


 "/usr/local/lib/python3.6/dist-packages/lightgbm/callback.py", line 191, in _init

raise ValueError('For early stopping, '
ValueError: For early stopping, at least one dataset and eval metric is required for evaluation
