DBSCAN聚类

def solve():
    import matplotlib
    matplotlib.use(____)
    import matplotlib.pyplot as plt
    from sklearn.datasets import load_iris
    from sklearn.cluster import KMeans
    import numpy as np
    iris = load_iris()
    X = iris.data[:, :____]
    km = KMeans(____)
    labels = km.fit_predict(____)
    plt.figure(figsize=(____, ____))
    colors = ['____', '____', '____']
    for i in range(____):
        plt.scatter(____)
    plt.scatter(____)
    plt.title(____)
    plt.legend()
    plt.tight_layout()
    plt.show()
    print(len(set(____)))