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[W 2020-07-02 16:28:05,165] Setting status of trial#0 as TrialState.FAIL because of the following error: AssertionError('[OptKeras] Monitor variable needs to be in the logs dictionary. Use a callback.',)
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/optuna/study.py", line 469, in _run_trial
    result = func(trial)
  File "/usr/local/lib/python3.6/dist-packages/optkeras/optkeras.py", line 130, in fun_tf
    return fun(trial)
  File "<ipython-input-6-acfc70c5c697>", line 41, in objective
    verbose=ok.keras_verbose )
  File "/usr/local/lib/python3.6/dist-packages/keras/engine/training.py", line 1239, in fit
    validation_freq=validation_freq)
  File "/usr/local/lib/python3.6/dist-packages/keras/engine/training_arrays.py", line 216, in fit_loop
    callbacks.on_epoch_end(epoch, epoch_logs)
  File "/usr/local/lib/python3.6/dist-packages/keras/callbacks/callbacks.py", line 152, in on_epoch_end
    callback.on_epoch_end(epoch, logs)
  File "/usr/local/lib/python3.6/dist-packages/optkeras/optkeras.py", line 300, in on_epoch_end
    assert self.monitor in logs, '[OptKeras] Monitor variable needs to be in the logs dictionary. Use a callback.'
AssertionError: [OptKeras] Monitor variable needs to be in the logs dictionary. Use a callback.

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Cell In [8], line 27
     25 import logging
     26 import optuna
---> 27 from optkeras.optkeras import OptKeras
     28 from sklearn.preprocessing import MinMaxScaler
     29 scaler = MinMaxScaler()

File ~/.conda/envs/deeplearning/lib/python3.10/site-packages/optkeras/optkeras.py:392
    390 from optuna.pruners import BasePruner
    391 from optuna.storages import BaseStorage  # NOQA
--> 392 from optuna.structs import TrialState
    395 class RepeatPruner(BasePruner):
    396     """ Prune if the same parameter set was found in Optuna database
    397         Coded based on source code of MedianPruner class at
    398         https://github.com/pfnet/optuna/blob/master/optuna/pruners/median.py
    399     """

ModuleNotFoundError: No module named 'optuna.structs'