Created
July 5, 2022 03:14
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Optuna without mlflow integration from this example (https://github.com/optuna/optuna-examples/blob/main/sklearn/sklearn_simple.py)
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""" | |
Optuna example that optimizes a classifier configuration for Iris dataset using sklearn. | |
In this example, we optimize a classifier configuration for Iris dataset. Classifiers are from | |
scikit-learn. We optimize both the choice of classifier (among SVC and RandomForest) and their | |
hyperparameters. | |
""" | |
import mlflow | |
import optuna | |
from optuna.integration.mlflow import MLflowCallback, RUN_ID_ATTRIBUTE_KEY | |
import sklearn.datasets | |
import sklearn.ensemble | |
import sklearn.model_selection | |
import sklearn.svm | |
optuna.logging.set_verbosity(optuna.logging.WARNING) | |
# FYI: Objective functions can take additional arguments | |
# (https://optuna.readthedocs.io/en/stable/faq.html#objective-func-additional-args). | |
class OptunaObjective: | |
def __init__(self, experiment_id): | |
self.experiment_id = experiment_id | |
def __call__(self, trial): | |
iris = sklearn.datasets.load_iris() | |
x, y = iris.data, iris.target | |
classifier_name = trial.suggest_categorical("classifier", ["SVC", "RandomForest"]) | |
if classifier_name == "SVC": | |
svc_c = trial.suggest_float("svc_c", 1e-10, 1e10, log=True) | |
classifier_obj = sklearn.svm.SVC(C=svc_c, gamma="auto") | |
else: | |
rf_max_depth = trial.suggest_int("rf_max_depth", 2, 32, log=True) | |
classifier_obj = sklearn.ensemble.RandomForestClassifier( | |
max_depth=rf_max_depth, n_estimators=10 | |
) | |
# https://scikit-learn.org/stable/modules/model_evaluation.html#scoring-parameter | |
metric = {"f": "f1_macro", "accuracy": "accuracy"} | |
score = sklearn.model_selection.cross_validate(classifier_obj, x, y, n_jobs=-1, cv=3, scoring=metric) | |
score = {k: v.mean() for k, v in score.items()} | |
accuracy = score["test_accuracy"] | |
# 簡単のために trial に登録されているパラメタのみ log するが、必要であれば適宜追記 | |
trial_params = trial.params | |
with mlflow.start_run(experiment_id=self.experiment_id, run_name=str(trial.number)): | |
mlflow.log_metrics(score) | |
mlflow.log_params(trial_params) | |
return accuracy | |
if __name__ == "__main__": | |
experiment_id = mlflow.create_experiment(name="optuna-experiment") # mlflow に保存される experiment-name | |
objective = OptunaObjective(experiment_id) | |
study = optuna.create_study(direction="maximize") | |
study.optimize(objective, n_trials=100) | |
print(study.best_trial) |
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