try:
    from sklearn.model_selection import train_test_split
except ImportError:
    from sklearn.cross_validation import train_test_split
from sklearn.datasets import make_classification
from sklearn.datasets import make_regression
from scipy.spatial import distance

from mla import knn
from mla.metrics.metrics import mean_squared_error, accuracy


def regression():
    # Generate a random regression problem
    X, y = make_regression(
        n_samples=500,
        n_features=5,
        n_informative=5,
        n_targets=1,
        noise=0.05,
        random_state=1111,
        bias=0.5,
    )
    X_train, X_test, y_train, y_test = train_test_split(
        X, y, test_size=0.25, random_state=1111
    )

    model = knn.KNNRegressor(k=5, distance_func=distance.euclidean)
    model.fit(X_train, y_train)
    predictions = model.predict(X_test)
    print("regression mse", mean_squared_error(y_test, predictions))


def classification():
    X, y = make_classification(
        n_samples=500,
        n_features=5,
        n_informative=5,
        n_redundant=0,
        n_repeated=0,
        n_classes=3,
        random_state=1111,
        class_sep=1.5,
    )

    X_train, X_test, y_train, y_test = train_test_split(
        X, y, test_size=0.1, random_state=1111
    )

    clf = knn.KNNClassifier(k=5, distance_func=distance.euclidean)

    clf.fit(X_train, y_train)
    predictions = clf.predict(X_test)
    print("classification accuracy", accuracy(y_test, predictions))


if __name__ == "__main__":
    regression()
    classification()
