To elaborate further, we notice that applying the learned coefficients for 1 to the results obtained by models reinforced on QA learned and QA equally , see Table 2, we obtain very similar scores (namely, 136.43 for QA equally and 136.4 for QA learned ).
the qualitative analysis reported in Tables 3 and 4 shows that while they perform sim-ilarly in terms of relevance, a significantly lower score for readability is obtained using QA equally .