尝试在python中绘制决策树

Question

请原谅我的天真。我正在尝试使用Jupyter笔记本在Python中生成一个决策树图。我不断遇到麻烦，我刚解决一个问题，另一个问题就露出了丑陋的脑袋。有人能建议链接到一个代码示例来绘制实际工作的决策树吗？我已经下载了Python 3.8(32位(、Python 3.9(64位(和Anaconda3。一个问题的例子是我运行了以下代码：

# https://chrisalbon.com/machine_learning/trees_and_forests/visualize_a_decision_tree/
# Load libraries
from sklearn.tree import DecisionTreeClassifier
from sklearn import datasets
from IPython.display import Image  
from sklearn import tree
# import pydotplus # 
# I pasted this into Anaconda prompt conda install pydotplus
# the error persisted after I said pip install pydotplus
import pydotplus
# Load data
iris = datasets.load_iris()
X = iris.data
y = iris.target
# Train Decision Tree
# Create decision tree classifer object
clf = DecisionTreeClassifier(random_state=0)
# Train model
model = clf.fit(X, y)
# continuing https://chrisalbon.com/machine_learning/trees_and_forests/visualize_a_decision_tree/
# Visualize Decision Tree
# Create DOT data
dot_data = tree.export_graphviz(clf, out_file=None, 
feature_names=iris.feature_names,  
class_names=iris.target_names)
# Draw graph
graph = pydotplus.graph_from_dot_data(dot_data)  
# Show graph
Image(graph.create_png())

在这一点上，我陷入了绝望：InvocationException Traceback(最后一次调用(在里面1011#显示图形--->12图像(graphic.create_png(((

~anaconda3libsite-packagespydotplusgraphviz.py in <lambda>(f, prog)
1795             self.__setattr__(
1796                 'create_' + frmt,
-> 1797                 lambda f=frmt, prog=self.prog: self.create(format=f, prog=prog)
1798             )
1799             f = self.__dict__['create_' + frmt]
~anaconda3libsite-packagespydotplusgraphviz.py in create(self, prog, format)
1957             self.progs = find_graphviz()
1958             if self.progs is None:
-> 1959                 raise InvocationException(
1960                     'GraphViz's executables not found')
1961 
InvocationException: GraphViz's executables not found

​我发现一些网站上说了一些关于更改路径的内容，但我不理解。我不是一名计算机科学家，我受过医学训练，但患有脑瘤，所以我学习了R并进行了临床试验研究。非常感谢您的帮助

Answer 1

在我的情况下，它在本地机器和Google Colab中都给出了输出。我建议制作一个单元格，并在jupyter笔记本中写入!pip install pydotplus。谷歌Colab 链接

https://colab.research.google.com/drive/11d8kFgNc6Wm2Qawi_e7aSvUHc-SIfYAl?usp=sharing