D-PAGE: Diverse Paraphrase Generation
Table 5: The average length of the sources, AvgLen(S), and average length of outputs of kth decoder, AvgLen(Dk), across Beam-4, Noise-4, VAE-4 and D-PAGE-4, on PPDB and Paralex.
['Dataset', 'Model', 'AvgLen(S)', 'AvgLen [ [ITALIC] D1,  [ITALIC] D2,  [ITALIC] D3, [ITALIC] D4]', 'Δ']
We also calculate the differences between longest and shortest averaged outputs by Δ=maxkAvgLen(Dk)−minkAvgLen(Dk). The average length of output sequences using D-PAGE-K is indeed longer than those of baselines. D-PAGE-K also achieves the largest Δ on both PPDB and Paralex, larger than 1.2. This shows that D-PAGE-K encodes more diverse patterns, with some decoders prefer to generate longer, probably more complex, sentence than others. In contrast, the baselines do not feature such distinct properties.