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Some computational complexity results for synchronous context-free grammars
HLT/EMNLP, pp.803-810, (2005)
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This paper investigates some computational problems associated with probabilistic translation models that have recently been adopted in the literature on machine translation. These models can be viewed as pairs of probabilistic context-free grammars working in a 'synchronous' way. Two hardness results for the class NP are reported, along ...More
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