Question: How much improvement is gained from Adversarial Reward Augmented Maximum Likelihood (ARAML)?
Answer: ARAM has achieved improvement over all baseline methods using reverese perplexity and  slef-BLEU metric.  The maximum reverse perplexity improvement 936,16 is gained for EMNLP2017  WMT  dataset and  48,44 for COCO dataset.
Alternative answer: Compared to the baselines, ARAML does not do better in terms of perplexity on COCO and EMNLP 2017 WMT datasets, but it does by up to 0.27 Self-BLEU points on COCO and 0.35 Self-BLEU on EMNLP 2017 WMT. In terms of Grammaticality and Relevance, it scores better than the baselines on up to 75.5% and 73% of the cases respectively.