As shown by the Stanford coreference resolver (Lee et al., 2011), the winner of last year's shared task, many coreference relations in OntoNotes can be identified using a fairly small set of simple hand-crafted rules.
in addition, to better understand the role played by the two sets of system parameters, we performed ab-lation experiments, showing for each language-track combination the results obtained without tuning (1) the rule relaxation parameters (− λ i 's); (2) the probability thresholds (− t j 's); and (3) any of these parameters (− λ i 's & t j ).