(Xue and Yang, 2011) presented results on a binary classification of whether or not a comma marks a sentence boundary, while the present work addresses a multi-category classification problem aimed at identifying discourse segments and preliminary discourse relations anchored by the comma.
to evaluate the performance of our model on this problem, we recomputed the results by putting IP COORD and SB in one category, putting VP COORD in another category and the rest of the labels in a third category.