An absolute comparison of the average rewards (rescaled from 0 to 1) of the last 1000 training episodes of each policy shows that greedy improves 'any valid sequence' by 71%, and learnt improves greedy by 29% (these differences are significant at p < 0.01).
there are other linguistic phenomena, such as alignment (Pickering and Garrod, 2004), consistency (Halliday and Hasan, 1976), and variation, which influence people's assessment of discourse (Levelt and Kelter, 1982) and generated output (Belz and Reiter, 2006;Foster and Oberlander, 2006).