plot_terminator_improvement

optuna.visualization.plot_terminator_improvement(study, plot_error=False, improvement_evaluator=None, error_evaluator=None, min_n_trials=20)

Plot the potentials for future objective improvement.

This function visualizes the objective improvement potentials, evaluated with improvement_evaluator. It helps to determine whether we should continue the optimization or not. You can also plot the error evaluated with error_evaluator if the plot_error argument is set to True. Note that this function may take some time to compute the improvement potentials.

Parameters:

• study (Study) – A Study object whose trials are plotted for their improvement.

• plot_error (bool) – A flag to show the error. If it is set to True, errors evaluated by error_evaluator are also plotted as line graph. Defaults to False.

• improvement_evaluator (BaseImprovementEvaluator | None) – An object that evaluates the improvement of the objective function. Defaults to RegretBoundEvaluator.

• error_evaluator (BaseErrorEvaluator | None) – An object that evaluates the error inherent in the objective function. Defaults to CrossValidationErrorEvaluator.

• min_n_trials (int) – The minimum number of trials before termination is considered. Terminator improvements for trials below this value are shown in a lighter color. Defaults to 20.

Returns:

A plotly.graph_objects.Figure object.

Return type:

Figure

Note

Added in v3.2.0 as an experimental feature. The interface may change in newer versions without prior notice. See https://github.com/optuna/optuna/releases/tag/v3.2.0.

The following code snippet shows how to plot improvement potentials, together with cross-validation errors.

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from lightgbm import LGBMClassifier
from sklearn.datasets import load_wine
from sklearn.model_selection import cross_val_score
from sklearn.model_selection import KFold
import optuna
from plotly.io import show
from optuna.terminator import report_cross_validation_scores
from optuna.visualization import plot_terminator_improvement


def objective(trial):
    X, y = load_wine(return_X_y=True)
    clf = LGBMClassifier(
        reg_alpha=trial.suggest_float("reg_alpha", 1e-8, 10.0, log=True),
        reg_lambda=trial.suggest_float("reg_lambda", 1e-8, 10.0, log=True),
        num_leaves=trial.suggest_int("num_leaves", 2, 256),
        colsample_bytree=trial.suggest_float("colsample_bytree", 0.4, 1.0),
        subsample=trial.suggest_float("subsample", 0.4, 1.0),
        subsample_freq=trial.suggest_int("subsample_freq", 1, 7),
        min_child_samples=trial.suggest_int("min_child_samples", 5, 100),
    )
    scores = cross_val_score(clf, X, y, cv=KFold(n_splits=5, shuffle=True))
    report_cross_validation_scores(trial, scores)
    return scores.mean()


study = optuna.create_study()
study.optimize(objective, n_trials=30)

fig = plot_terminator_improvement(study, plot_error=True)
show(fig)