Dataset Models R-1 R-2 R-WE-1 R-WE-2 LexRank (Erkan and Radev, 2004) 35.95 7.47 36.91 7.91 Submodular (Lin and Bilmes, 2011) 39.18 9.35 40.03 9.92 RegSum  38.57 9.75 39.12 10.33 ILPSumm (Banerjee et al., 2015) 39.24 11.99 40.21 12.08 PDG* (Yasunaga et al., 2017) 38 TextRank (Mihalcea and Tarau, 2004) 27.56 6.12 28.20 6.45 Opinosis (Ganesan et al., 2010) 32.35 9.13 33.54 9.41 Biclique (Muhammad et al., 2016) 33.03 8.96 33.91 9.25 ParaFuse doc (ours) 33.86 9.74 34.46 10.09 Table 3: Results on DUC 2004 (Task-2) and Opinosis 1.0 Evaluation Metric: We evaluate our summarization system using ROUGE 11 (Lin, 2004) on DUC 2004 (Task-2, Length limit (L) = 100 Words) and Opinosis 1.0 (L = 15 Words).
rOUGE scores are unfairly biased towards lexical overlap at surface level.