Informative and Controllable Opinion Summarization
Table 3: Proportion of summaries which mention a specific aspect/sentiment. Boldfaced values show a significant increase (p<0.01; using two-sample bootstrap tests) compared to the non-customized system variant. Aspects are not mutually exclusive (e.g. a summary may talk about both acting and plot), thus the total percentage may exceed 100%.
['[EMPTY]', 'AE+Att+Copy', 'AE+Att+Copy', 'AE+Att+Copy+Salient', 'AE+Att+Copy+Salient']
Overall, we observe that AE+Att+Copy is able to customize summaries to a great extent. In all cases, crowdworkers perceive a significant increase in the proportion of aspect x when using Cust(x). AE+Att+Copy+Salient is unable to generate need-specific summaries, showing no discernible difference between generic and customized summaries. This shows that the use of an extractive module, which is used as one of the main components of EA-based approaches, limits the flexibility of the abstractive model to customize summaries based on a user need.