Unfortunately, due to the flat representation of these constructions in the gold standard trees, this insight on the part of our learner is not reflected in the accuracy measures in Table 1. short length of child-directed utterances, and therefore the right-branching baseline (RB) outperforms all systems by a wide margin on this corpus.
we argue that such utterances are a more realistic model of input to human language learners than newswire text, and therefore preferable for evaluation of systems that purport to model human language acquisition.