XQRExtended Quadratic Residue
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We have build a prototype system named XQR using Java (J2SE 6.0) and Berkeley DB Java Edition 3.2.13 [13] was employed as the storage manager.
Figure 9(a) shows that for the same top K value, the average precision of XQR is much higher than that of Lucene.
From Figure 10, we can see that both average precision and recall of Lucene are much lower than those of XQR and are close to 0.