As we can see from the table, considering the systems that only use sentence level information, CNN1 significantly outperforms the MaxEnt classifier as well as the joint beam search with local features from <cite>Li et al. (2013b)</cite> (an improvement of 1.6% in F1 score), and performs comparably with the joint beam search approach using both local and global features<cite> (Li et al., 2013b)</cite> .