Model adaptation via model interpolation and boosting for web search ranking

  • Authors:
  • Jianfeng Gao;Qiang Wu;Chris Burges;Krysta Svore;Yi Su;Nazan Khan;Shalin Shah;Hongyan Zhou

  • Affiliations:
  • Microsoft Research, Redmond;Microsoft Research, Redmond;Microsoft Research, Redmond;Microsoft Research, Redmond;Johns Hopkins University;Microsoft Bing Search, Redmond;Microsoft Bing Search, Redmond;Microsoft Bing Search, Redmond

  • Venue:
  • EMNLP '09 Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing: Volume 2 - Volume 2
  • Year:
  • 2009

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Abstract

This paper explores two classes of model adaptation methods for Web search ranking: Model Interpolation and error-driven learning approaches based on a boosting algorithm. The results show that model interpolation, though simple, achieves the best results on all the open test sets where the test data is very different from the training data. The tree-based boosting algorithm achieves the best performance on most of the closed test sets where the test data and the training data are similar, but its performance drops significantly on the open test sets due to the instability of trees. Several methods are explored to improve the robustness of the algorithm, with limited success.