The third is a similar neural network that approximates to 1 the   Table 2, nn-cos is overall the best model for Qs, whereas nn-dot is the best model for Cs.
mean average precision (mAP) is higher in nn-cos for 3 out of 4 Qs, with only most reaching slightly better mAP in Q nn-dot due to the high number of cases confounded with all by the Q nn-cos model (see Table 3).