Head-driven Phrase Structure Grammar (HPSG) has been found to benefit from joint training and decoding under a uniform formalism . However, decoding this unified grammar has a higher time complexity ($O(n^5)$) than decoding either form individually . We propose an improved head scorer that helpsachieve a novel performance-preserved parscher in $O$($n^3$) time complexity . We also present a more effective, morein-depth, and general work on HPSG parsing. We also explore the generalmethod of training an H PSG-based parscher from only a constituent or dependencyannotations in a multilingual scenario .

Author(s) : Zuchao Li, Junru Zhou, Hai Zhao, Kevin Parnow

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Keywords : complexity - head - time - decoding - driven -

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