如何使用 export_graphviz 显示决策树图

Question

新手

使用微软版本 10，python 3.5.2，dot - graphviz 版本 2.38.0（正确安装）

尝试使用 export_graphviz 可视化决策树。觉得已经很接近了，就是做不到最后一步

这里是示例代码

from sklearn.datasets import load_iris
from sklearn import tree
clf = tree.DecisionTreeClassifier()
iris = load_iris()
clf = clf.fit(iris.data, iris.target)
tree.export_graphviz(clf, out_file='tree.dot')

`

输出'tree.dot'文件。双击时，它会调用microsoft word并显示以下文本。

digraph Tree {
node [shape=box] ;
0 [label="X[2] <= 2.45\ngini = 0.6667\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 = 0.0408\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 = 0.4444\nsamples = 6\nvalue = [0, 2, 4]"] ;
3 -> 7 ;
8 [label="gini = 0.0\nsamples = 3\nvalue = [0, 0, 3]"] ;
7 -> 8 ;
9 [label="X[0] <= 6.95\ngini = 0.4444\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 = 0.0425\nsamples = 46\nvalue = [0, 1, 45]"] ;
2 -> 12 ;
13 [label="X[1] <= 3.1\ngini = 0.4444\nsamples = 3\nvalue = [0, 1, 2]"] ;
12 -> 13 ;
14 [label="gini = 0.0\nsamples = 2\nvalue = [0, 0, 2]"] ;
13 -> 14 ;
15 [label="gini = 0.0\nsamples = 1\nvalue = [0, 1, 0]"] ;
13 -> 15 ;
16 [label="gini = 0.0\nsamples = 43\nvalue = [0, 0, 43]"] ;
12 -> 16 ;
}

此示例代码可以正常工作

[http://scikit-learn.org/stable/auto_examples/tree/plot_iris.html#sphx-glr-auto-examples-tree-plot-iris-py ][1]

提前致谢

Answer 1

这个答案对我来说非常有用！谢谢阿什利！

对于windows：dl msi 并安装；在您的程序列表中找到 gvedit.exe；打开有问题的 .dot 文件；点击工具栏上的运行人；转到图表 - >设置;将输出文件类型更改为您喜欢的文件类型，然后按确定。它什么也没说，您只是在与 .dot 文件相同的目录中找到该文件。 – ashley 2015 年 3 月 26 日在 9:15

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