我想绘制一个随机森林的决策树。所以,我创建以下代码:
clf = RandomForestClassifier(n_estimators=100)
import pydotplus
import six
from sklearn import tree
dotfile = six.StringIO()
i_tree = 0
for tree_in_forest in clf.estimators_:
if (i_tree <1):
tree.export_graphviz(tree_in_forest, out_file=dotfile)
pydotplus.graph_from_dot_data(dotfile.getvalue()).write_png('dtree'+ str(i_tree) +'.png')
i_tree = i_tree + 1
但它没有产生任何东西..你知道如何从随机森林中绘制决策树吗?
谢谢,
假设已经安装了随机森林模型,首先应首先导入export_graphviz
函数:
from sklearn.tree import export_graphviz
在您的for循环中,您可以执行以下操作来生成dot
文件
export_graphviz(tree_in_forest,
feature_names=X.columns,
filled=True,
rounded=True)
下一行生成一个png文件
os.system('dot -Tpng tree.dot -o tree.png')
你可以绘制一棵树:
from sklearn.tree import export_graphviz
from IPython import display
from sklearn.ensemble import RandomForestRegressor
m = RandomForestRegressor(n_estimators=1, max_depth=3, bootstrap=False, n_jobs=-1)
m.fit(X_train, y_train)
str_tree = export_graphviz(m,
out_file=None,
feature_names=X_train.columns, # column names
filled=True,
special_characters=True,
rotate=True,
precision=0.6)
display.display(str_tree)