Minor: removed extra parenthesis in doc (#3119)

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Dmitry Mottl 2018-02-20 11:55:29 +01:00 committed by Philip Hyunsu Cho
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DART booster
============
[XGBoost](https://github.com/dmlc/xgboost)) mostly combines a huge number of regression trees with a small learning rate.
[XGBoost](https://github.com/dmlc/xgboost) mostly combines a huge number of regression trees with a small learning rate.
In this situation, trees added early are significant and trees added late are unimportant.
Vinayak and Gilad-Bachrach proposed a new method to add dropout techniques from the deep neural net community to boosted trees, and reported better results in some situations.