25. The machine-readable storage of claim 24 wherein the search engine is further configured to use ratios of the predictive outputs of the first and second models to adjust the respective ranking scores of the given search results.
24. The machine-readable storage of claim 23 wherein providing the model for use with the search engine comprises providing the first and second models for use with the search engine, wherein the search engine is configured to use predictive outputs of the first and second models to adjust respective ranking scores of the given search results obtained as the search results for the given query to reduce presentation bias in a presentation of the given search results, and wherein the search engine is configured to provide the presentation bias and relevance features of the given search results as input to the first and second models.