Python机器学习(1)：KMeans聚类

Python进行KMeans聚类是比较简单的，首先需要import numpy，从sklearn.cluster中import KMeans模块：

import numpy as np
from sklearn.cluster import KMeans

然后读取txt文件，获取相应的数据并转换成numpy array：

X = []
f = open('rktj4.txt')
for v in f:
    regex = re.compile('s+')
    X.append([float(regex.split(v)[3]), float(regex.split(v)[6])])

X = np.array(X)

设置类的数量，并聚类：

n_clusters = 5
cls = KMeans(n_clusters).fit(X)

完整代码：

import numpy as np
from sklearn.cluster import KMeans
import matplotlib.pyplot as plt
import re

X = []
f = open('rktj4.txt')
for v in f:
    regex = re.compile('s+')
    X.append([float(regex.split(v)[3]), float(regex.split(v)[6])])

X = np.array(X)

n_clusters = 5
cls = KMeans(n_clusters).fit(X)
cls.labels_

markers = ['^','x','o','*','+']
for i in range(n_clusters):
    members = cls.labels_ == i
    plt.scatter(X[members, 0], X[members, 1], s=60, marker=markers[i], c='b', alpha=0.5)
    print 
    
plt.title('')
plt.show()

运行结果：