... terms of the set of mnemonics (that is, by the nodes in the mnemonic tree), rather that in terms of the actual nonterminals of the grammar. It is in this manner that we can obtain efficient and ... that the geometric mean of the number of parses per word, or equivalently the total num- ber of parses for the entire test set, must be held con- stant over the course of the grammar's development, ... modification of the CKY algorithm which takes into account the treebank parse is, then, the follow- ing. Given a pair of nonterminals B and C in the CKY chart, if the span of the parent is...