Difference between revisions of "Ensemble"
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'''Ensembles''' are machine learning methods that combine several models/predictors to generate more accurate predictions. | '''Ensembles''' are machine learning methods that combine several models/predictors to generate more accurate predictions. | ||
| − | This reduces the [[variance]] of the predictions. Examples for ensemble methods are boosting, stacking, voting, bagging, and random forests, but also simple linear combinations of the predictor outputs. Ensembles are used for [[recommender systems]] to improve the quality of recommendations, and have been particularly popular in [[competitions]] like the [[Netflix Prize]], where raw prediction accuracy (as opposed to [[user satisfaction]], [[diversity]], [[serendipity]]) was used to determine the winner. | + | This reduces the [[variance]] of the predictions. Examples for ensemble methods are boosting, stacking, voting, bagging, and random forests, but also simple linear combinations of the predictor outputs. Ensembles are used for [[Recommender System|recommender systems]] to improve the quality of recommendations, and have been particularly popular in [[competitions]] like the [[Netflix Prize]], where raw prediction accuracy (as opposed to [[user satisfaction]], [[diversity]], [[serendipity]]) was used to determine the winner. |
== External links == | == External links == | ||
Revision as of 08:58, 22 February 2011
Ensembles are machine learning methods that combine several models/predictors to generate more accurate predictions. This reduces the variance of the predictions. Examples for ensemble methods are boosting, stacking, voting, bagging, and random forests, but also simple linear combinations of the predictor outputs. Ensembles are used for recommender systems to improve the quality of recommendations, and have been particularly popular in competitions like the Netflix Prize, where raw prediction accuracy (as opposed to user satisfaction, diversity, serendipity) was used to determine the winner.
