Note that the system (Rotsztejn et al., 2018) integrates many techniques like feature-engineering, model combination, pretraining embeddings on in-domain data, and artificial data generation, while our model is almost a direct adaption from the ACE architecture.
compared to the top singlemodel result (Luan et al., 2018), which makes use of additional word and entity embeddings pretrained on in-domain data, our methods demonstrate clear advantage as a single model.