说明：  本文为Lafferty给人留下印象最深的论文－－2001年的conditional random fields，这篇文章后来被疯狂引用，广泛地应用在语言和图像处理，并随之出现了很多的变体。
(This article Lafferty left the deepest impression of the thesis- 2001 years of conditional random fields, this article was later cited crazy, widely used in language and image processing, and subsequently appeared in many variations.)