For example, Huang and Harper (2010) used annotated prosodic breaks as a kind of punctuation in a supervised PCFG, while prosodic breaks learned in a semi-supervised way have been used as features for parse reranking (Kahn et al., 2005) or PCFG statesplitting (Dreyer and Shafran, 2007).
to these methods, our approach observes neither parse trees nor prosodic annotations.