1. A system, comprising: one or more processors configured to: obtain a first set of ranked results by using a first ranking model to determine first rank scores corresponding to respective ones of at least some of a plurality of matching information items, wherein the first ranking model comprises a linear model; select a portion of the first set of ranked results based at least in part on one or more selection criteria, wherein the one or more selection criteria comprises: a number of search results to display at a page and a ratio of a selected number of the first set of ranked results to a total number of the first set of ranked results; obtain a second set of ranked results by using a second ranking model to determine second rank scores corresponding to respective ones of at least some of the selected portion of the first set of ranked results, wherein the second ranking model comprises a nonlinear ranking model; and generate a search response based at least in part on the second set of ranked results; and one or more memories coupled to the one or more processors and configured to provide instructions to the one or more processors.
1. A system, comprising: one or more processors configured to: obtain a first set of ranked results by using a first ranking model to determine first rank scores corresponding to respective ones of at least some of a plurality of matching information items, wherein the first ranking model comprises a linear model; select a portion of the first set of ranked results based at least in part on one or more selection criteria, wherein the one or more selection criteria comprises: a number of search results to display at a page and a ratio of a selected number of the first set of ranked results to a total number of the first set of ranked results; obtain a second set of ranked results by using a second ranking model to determine second rank scores corresponding to respective ones of at least some of the selected portion of the first set of ranked results, wherein the second ranking model comprises a nonlinear ranking model; and generate a search response based at least in part on the second set of ranked results; and one or more memories coupled to the one or more processors and configured to provide instructions to the one or more processors. 2. The system of claim 1 , wherein the plurality of matching information items comprises a second plurality of matching information items and wherein the one or more processors are further configured to: receive a search request; generate a first plurality of matching information items based at least in part on the search request; and select from the first plurality of matching information items the second plurality of matching information items.