Several parallel efforts have been made recently to improve the efficiency of IE tasks by optimizing low-level feature extraction (Ramakrishnan et al., 2006;Chandel et al., 2006) or by reordering operations at a macroscopic level (Ipeirotis et al., 2006;Shen et al., 2007;Jain et al., 2009).
to the best of our knowledge, SystemT is the only IE system in which the optimizer generates a full end-to-end plan, beginning with low-level extraction primitives and ending with the final output tuples.