Trees, forests, chickens, and eggs: when and why to prune trees in a random forest
Trees, forests, chickens, and eggs: when and why to prune trees in a random forest
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树、森林、鸡和蛋:何时以及为何在随机森林中修剪树木
DOI:
10.1002/sam.11594
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Mentch, Lucas
中科院分区:
文献类型:
--
作者:
Zhou, Siyu;Mentch, Lucas
Due to their long‐standing reputation as excellent off‐the‐shelf predictors, random forests (RFs) continue to remain a go‐to model of choice for applied statisticians and data scientists. Despite their widespread use, however, until recently, little was known about their inner workings and about which aspects of the procedure were driving their success. Very recently, two competing hypotheses have emerged–one based on interpolation and the other based on regularization. This work argues in favor of the latter by utilizing the regularization framework to reexamine the decades‐old question of whether individual trees in an ensemble ought to be pruned. Despite the fact that default constructions of RFs use near full depth trees in most popular software packages, here we provide strong evidence that tree depth should be seen as a natural form of regularization across the entire procedure. In particular, our work suggests that RFs with shallow trees are advantageous when the signal‐to‐noise ratio in the data is low. In building up this argument, we also critique the newly popular notion of “double descent” in RFs by drawing parallels toU‐statistics and arguing that the noticeable jumps in random forest accuracy are the result of simple averaging rather than interpolation.
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DOI:
--
发表时间:
2019-11
期刊:
J. Mach. Learn. Res.
影响因子:
--
作者:
L. Mentch;Siyu Zhou
通讯作者:
L. Mentch;Siyu Zhou
影响因子:
5.7
作者:
Hastie, Trevor;Tibshirani, Robert;Tibshirani, Ryan
通讯作者:
Tibshirani, Ryan
DOI:
--
发表时间:
2015
期刊:
International Conference on Smart Cities
影响因子:
--
作者:
Mehreen Ahmed;Maham Jahangir;H. Afzal;A. Majeed;Imran Siddiqi
通讯作者:
Imran Siddiqi
影响因子:
7.3
作者:
A. Cammarata
通讯作者:
A. Cammarata
影响因子:
3
作者:
Song Mei;A. Montanari
通讯作者:
Song Mei;A. Montanari