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from sklearn.datasets import load_iris
from sklearn import tree
import pydotplus
iris = load_iris()
clf = tree.DecisionTreeClassifier()
clf = clf.fit(iris.data, iris.target)
with open("iris.dot", 'w') as f:
f = tree.export_graphviz(clf, out_file=f)
dot_data = tree.export_graphviz(clf, out_file=None,
feature_names=iris.feature_names,
class_names=iris.target_names,
filled=True, rounded=True,
special_characters=True)
graph = pydotplus.graph_from_dot_data(dot_data)
graph.write_pdf("iris.pdf")执行代码之后，可以在当前路径下看到已经生成了iris.dot和iris.pdf文件了，打开iris.dot显示如下：
digraph Tree {
node [shape=box] ;
0 [label="X[3] <= 0.8\ngini = 0.667\nsamples = 150\nvalue = [50, 50, 50]"] ;
1 [label="gini = 0.0\nsamples = 50\nvalue = [50, 0, 0]"] ;
0 -> 1 [labeldistance=2.5, labelangle=45, headlabel="True"] ;
2 [label="X[3] <= 1.75\ngini = 0.5\nsamples = 100\nvalue = [0, 50, 50]"] ;
0 -> 2 [labeldistance=2.5, labelangle=-45, headlabel="False"] ;
3 [label="X[2] <= 4.95\ngini = 0.168\nsamples = 54\nvalue = [0, 49, 5]"] ;
2 -> 3 ;
4 [label="X[3] <= 1.65\ngini = 0.041\nsamples = 48\nvalue = [0, 47, 1]"] ;
3 -> 4 ;
5 [label="gini = 0.0\nsamples = 47\nvalue = [0, 47, 0]"] ;
4 -> 5 ;
6 [label="gini = 0.0\nsamples = 1\nvalue = [0, 0, 1]"] ;
4 -> 6 ;
7 [label="X[3] <= 1.55\ngini = 0.444\nsamples = 6\nvalue = [0, 2, 4]"] ;
3 -> 7 ;
8 [label="gini = 0.0\nsamples = 3\nvalue = [0, 0, 3]"] ;
7 -> 8 ;
9 [label="X[2] <= 5.45\ngini = 0.444\nsamples = 3\nvalue = [0, 2, 1]"] ;
7 -> 9 ;
10 [label="gini = 0.0\nsamples = 2\nvalue = [0, 2, 0]"] ;
9 -> 10 ;
11 [label="gini = 0.0\nsamples = 1\nvalue = [0, 0, 1]"] ;
9 -> 11 ;
12 [label="X[2] <= 4.85\ngini = 0.043\nsamples = 46\nvalue = [0, 1, 45]"] ;
2 -> 12 ;
13 [label="X[0] <= 5.95\ngini = 0.444\nsamples = 3\nvalue = [0, 1, 2]"] ;
12 -> 13 ;
14 [label="gini = 0.0\nsamples = 1\nvalue = [0, 1, 0]"] ;
13 -> 14 ;
15 [label="gini = 0.0\nsamples = 2\nvalue = [0, 0, 2]"] ;
13 -> 15 ;
16 [label="gini = 0.0\nsamples = 43\nvalue = [0, 0, 43]"] ;
12 -> 16 ;
}
打开iris.pdf显示如下：
