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      Unification
      發布時間:2019年05月15日     發布人:nanyuzi  
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      Unification

      統一

       

      A term used for the central operation within a number of recent grammatical theories, which have been termed ‘unification-based approaches to grammar’. Unification is the merging of two descriptions to form a more specific description which is consistent with both. For example, a noun in description D1 might be specified for countability but not for case, whereas in D2 the same noun might be specified for case but not countability. The two descriptions could then be unified, and any operations which could be carried out on either of the original descriptions could then be performed on the unified description. The approach has advantages for grammatical analysis, in that it allows a grammar to specify constraints on the language without having to state the order in which the constraints are applied: regardless of the number of unifications it takes to fully specify a category, these unifications can be applied in any order. The approach thus has advantages for computational parsing, in that it allows a parser to work with partial descriptions, gradually accumulating information about a grammatical category as it deals with different entries in the lexicon.

       

      最近一些語法理論用來指一項中心操作,稱作“基于統一的語法分析法”。統一就是把兩種描寫合并,得出一種更具體的而又與兩種描寫都一致的描寫。例如一個名詞在一種描寫D1中可能只指定格而未指定可數性,而在D2中同一名詞只指定可數性而未指定格。于是可將兩種描寫統一,結果是適用于原來任一種描寫的操作也都適用于統一的描寫。這種方法對語法分析的好處在于,能允許語法指定對語言的各項制約而無需說明應用這些制約的序次:不管完全指定一個范疇需要多少次統一,這些統一操作可以以任何序次進行。這種方法因而有利于計算機分解,因為它允許一個分解器先從部分描寫開始,隨著處理中的詞庫中詞條的增加逐漸積累有關某個語法范疇的信息。

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      在线精品国产一区二区三区,欧美最猛性XXXXX大叫,亚欧美日韩香蕉在线播放视频