学习曲线

def solve():
    import matplotlib
    matplotlib.use(____)
    import matplotlib.pyplot as plt
    import numpy as np
    from sklearn.datasets import load_iris
    from sklearn.model_selection import learning_curve
    from sklearn.ensemble import RandomForestClassifier
    iris = load_iris()
    X = iris.data
    y = iris.target
    train_sizes, train_scores, test_scores = learning_curve(
        RandomForestClassifier(____),
        X, y, cv=____, train_sizes=np.linspace(____, ____, ____))
    plt.figure(figsize=(____, ____))
    plt.plot(train_sizes, train_scores.mean(____), label='____')
    plt.plot(train_sizes, test_scores.mean(____), label='____')
    plt.legend()
    plt.title(____)
    plt.tight_layout()
    plt.show()
    print(len(____))