Firstly, we tune λ 1 by fixing λ 2 = 0.1.
dependency parsing is a crucial component of many natural language processing systems, for tasks such as text classification (Özgür and Güngör, 2010), statistical machine translation (Xu et al., 2009), relation extraction (Bunescu and Mooney, 2005), and question answering (Cui et al., 2005).