Figure 1
From: Question answering system using Q & A site corpus Query expansion and answer candidate evaluation
Outlines of Web document retrieval and candidate answer evaluation with and without query expansion. This figure shows the outlines of the Web document retrieval and the candidate answer evaluation with and without query expansion. D 1∪D 2 and D 3 each represents the candidate answers with and without query expansion. The number of the documents of D 1∪D 2 was equalized to that of D 3 for the fair comparison.