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- W1964071993 abstract "We investigate the problem of training probabilistic context-free grammars on the basis of a distribution defined over an infinite set of trees, by minimizing the cross-entropy. This problem can be seen as a generalization of the well-known maximum likelihood estimator on (finite) tree banks. We prove an unexpected theoretical property of grammars that are trained in this way, namely, we show that the derivational entropy of the grammar takes the same value as the cross-entropy between the input distribution and the grammar itself. We show that the result also holds for the widely applied maximum likelihood estimator on tree banks." @default.
- W1964071993 created "2016-06-24" @default.
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- W1964071993 date "2006-01-01" @default.
- W1964071993 modified "2023-10-16" @default.
- W1964071993 title "Cross-entropy and estimation of probabilistic context-free grammars" @default.
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- W1964071993 doi "https://doi.org/10.3115/1220835.1220878" @default.
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