Implement log scale of parallel coordinate

[keisuke-umezawa]

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Reference Issues/PRs

NA

Log axis if distribution is log scale for parallel coordinate plot

scripts

import logging

import optuna
from optuna_dashboard._app import create_app


host = "127.0.0.1"
port = 8080

optuna.logging.set_verbosity(logging.CRITICAL)


def create_optuna_storage() -> optuna.storages.InMemoryStorage:
    storage = optuna.storages.InMemoryStorage()

    # Single-objective study
    study = optuna.create_study(study_name="single-objective", storage=storage)

    def objective_single(trial: optuna.Trial) -> float:
        x1 = trial.suggest_float("x1", 0, 10)
        x2 = trial.suggest_float("x2", 0.1, 10, log=True)
        x3 = trial.suggest_categorical("x3", ["foo", "bar"])
        return (x1 - 2) ** 2 + (x2 - 5) ** 2

    study.optimize(objective_single, n_trials=100)

    return storage


def main() -> None:
    storage = create_optuna_storage()
    app = create_app(storage, debug=True)
    app.run(host=host, port=port, reloader=True)


if __name__ == "__main__":
    main()

[codecov]

Codecov Report

Merging #627 (4250c59) into main (02bfb79) will increase coverage by 6.04%.
Report is 21 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #627      +/-   ##
==========================================
+ Coverage   56.40%   62.45%   +6.04%     
==========================================
  Files          35       35              
  Lines        2193     2224      +31     
==========================================
+ Hits         1237     1389     +152     
+ Misses        956      835     -121     

Files	Coverage Δ
optuna_dashboard/_preference_setting.py	88.88% <ø> (ø)

... and 4 files with indirect coverage changes

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[keisuke-umezawa]

ref: https://github.com/optuna/optuna/blob/master/optuna/visualization/_parallel_coordinate.py#L213-L230

[c-bata]

@not522 @gen740 Could you review this PR?

[c-bata]

A nit.

Suggested change

	// numerical and non-log
	// numerical and linear

Or you can simply remove these comments.

[gen740]

LGTM! It works as expected.

[not522]

Thank you for your PR. Please check my comment.

[not522]

Both ends of ticks should be within the range.

Suggested change

	const range = [minValue, maxValue]
	const range = [Math.floor(minValue), Math.ceil(maxValue)]

[keisuke-umezawa]

@not522 Thank you for reviewing. Could you check it again?

[not522]

LGTM!