Finite State Transducers 详解_yongheng5871_新浪博客



Finite State Transducers 详解_yongheng5871_新浪博客

Finite State Transducers 简称 FST， 中文名：有穷状态转换器。在自然语言处理等领域有很大应用，其功能类似于字典的功能（STL 中的map，C# 中的Dictionary），但其查找是O（1）的，仅仅等于所查找的key长度。目前Lucene4.0在查找Term时就用到了该算法来确定此Term在字典中的位置。

      FST 可以表示成FST<Key, Value>的形式，我们可以用O（length（key））的复杂度，找到key所对应的值。除此之外，FST 还支持用Value来查找key以及查找Value最优的key等功能。


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