Machine Learning with Scikit-Learn and Tensorflow 7.6 Extra-Trees
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书籍信息
Hands-On Machine Learning with Scikit-Learn and Tensorflow
出版社: O’Reilly Media, Inc, USA
平装: 566页
语种: 英语
ISBN: 1491962291
条形码: 9781491962299
商品尺寸: 18 x 2.9 x 23.3 cm
ASIN: 1491962291
系列博文为书籍中文翻译
代码以及数据下载:https://github.com/ageron/handson-ml
当训练随机森林的决策树时,我们从部分特征中寻找最优的特征。事实上,我们也能尝试在此基础上使用随机的阈值分割当前特征,而不是寻找最优的阈值,这是Extra-Trees(Extremely Randomized Trees)的基本思想。这样的思想再次增加偏差,减少方差。通常,Extra-Trees训练速度优于随机森林,因为寻找最优的阈值是决策树训练耗时的部分。
我们可以利用scikit-learn提供的ExtraTreesClassifier/ExtraTreesRegressor实现上面的思想。这些API的参数和RandomForestClassifier/RandomForestRegressor相同。
注释:
我们难以事先得知ExtraTreesClassifier/ExtraTreesRegressor和RandomForestClassifier/RandomForestRegressor的效果孰优孰劣。常用的方法是分别加以尝试,使用grid search寻找最优的参数并且使用交叉验证获得模型的效果。
- Machine Learning with Scikit-Learn and Tensorflow 7.6 Extra-Trees
- Machine Learning with Scikit-Learn and Tensorflow 6.4 CART算法
- Machine Learning with Scikit-Learn and Tensorflow 6.5 计算复杂度
- Machine Learning with Scikit-Learn and Tensorflow 6.8 决策树回归
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- Machine Learning with Scikit-Learn and Tensorflow 7.5 随机森林
- Machine Learning with Scikit-Learn and Tensorflow 7.8 AdaBoost
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