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Comments (3)

nzw0301 avatar nzw0301 commented on May 25, 2024

Hi, could you share minimal reproducible codes with us?

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Guillaume227 avatar Guillaume227 commented on May 25, 2024

Sure, that reproduces the issue:

def test_gridsampler_ask_tell():

    def objective(trial):
        x = trial.suggest_float("x", 0, 10)
        return x ** 2

    search_space = dict(x=[1, 2])
    study = optuna.study.create_study(sampler=optuna.samplers.GridSampler(search_space))
    for i in range(2):
        trial = study.ask()
        value = objective(trial)
        study.tell(trial, value)

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nzw0301 avatar nzw0301 commented on May 25, 2024

Thanks. I think this is intended behaviour according to #4121 (comment), so this is not a bug. The docs should clarify this workaround or grid-search doesn't to assume ask-and-tell interface.

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