V2EX n-gram

N-gram

释义 Definition

n-gram(n元语法/n元组):在一段文本或语音序列中,连续出现的 n 个词/字符/标记(token)组成的片段。常用于语言模型、文本统计、信息检索、拼写纠错与机器翻译等任务。(n=1 为 unigram;n=2 为 bigram;n=3 为 trigram)

发音 Pronunciation (IPA)

/n rm/

例句 Examples

I built a bigram model using n-grams from the training data.
我用训练数据里的 n-gram 构建了一个二元语言模型。

Because n-grams capture local context, they can improve search suggestions, but they also struggle with long-distance dependencies.
由于 n-gram 能捕捉局部上下文,它们可以改进搜索联想,但也难以处理长距离依赖关系。

词源 Etymology

n-gram由两部分构成:n(表示长度为 n)+ -gram(源自希腊语 gramma,意为“书写的东西/字母”)。该术语在计算语言学与信息论相关的统计建模中逐渐固定,用来指代“长度为 n 的连续序列”。

相关词 Related Words

文学/著作中的用例 Literary / Notable Works

  • Speech and Language Processing(Daniel Jurafsky & James H. Martin)以 n-gram 语言模型为经典入门内容之一
  • Foundations of Statistical Natural Language Processing(Christopher D. Manning & Hinrich Schütze)系统讨论 n-gram 与统计方法
  • “A Mathematical Theory of Communication”(Claude E. Shannon, 1948)信息论背景下的序列统计思想与语言建模相关概念常与 n-gram 一并讲解
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