决策树可视化

案例：

from sklearn import tree
from IPython.display import Image
import pydotplus
dot_data = tree.export_graphviz(model, out_file=None, filled=True, rounded=True, special_characters=True)

graph = pydotplus.graph_from_dot_data(dot_data)

graph.write_pdf('iris.pdf')

Image(graph.create_png())