However, there are approaches such as discriminative reranking (Collins and Koo, 2005) to rerank the output of an existing system that offer a means for further improving the performance of our SLL+RLL model.
the oracle performance using the top-10 Viterbi paths from our SLL+RLL model has an F-score of 82.11 for opinion expressions, 76.77 for targets and 78.10 for holders.