Good–Turing frequency estimation is a statistical technique for estimating the probability of encountering an object of a hitherto unseen species, given a set of past observations of objects from different species. In drawing balls from an urn, the 'objects' would be balls and the 'species' would be the distinct … See more Good–Turing frequency estimation was developed by Alan Turing and his assistant I. J. Good as part of their methods used at Bletchley Park for cracking German ciphers for the Enigma machine during World War II. Turing at first … See more Many different derivations of the above formula for $${\displaystyle p_{r}}$$ have been given. One of the simplest … See more The Good–Turing estimator is largely independent of the distribution of species frequencies. Notation • Assuming that $${\displaystyle X}$$ distinct species have been observed, enumerated See more • Ewens sampling formula • Pseudocount See more • David A. McAllester, Robert Schapire (2000) On the Convergence Rate of Good–Turing Estimators, Proceedings of the Thirteenth Annual Conference on Computational … See more WebGood(1953)首先描述了Good-Turing算法,而这种算法的原创思想则来自Turing 。 ii. Good-Turing平滑的基本思想是:用观察较高的N元语法数的方法来重新估计概率量的大小,并把它指派给那些具有零计数或较低计数的N元语法。
图灵估计 - 维基百科,自由的百科全书
WebNov 23, 2024 · 贝叶斯方法是一个历史悠久,有着坚实的理论基础的方法,同时处理很多问题时直接而又高效,很多高级自然语言处理模型也可以从它演化而来。 因此,学习贝叶斯 … WebApr 21, 2005 · Good-Turing estimation • Idea: reallocate the probability mass of n-grams that occur r + 1 times in the training data to the n-grams that occur r times. • In particular, … screen recorder for minecraft pc
语言模型中几种平滑算法,加法平滑、图灵算法、插值算法,都能 …
WebMar 13, 2024 · Good-Turing Good-Turing技术是在1953年由古德(I.J.Good)引用图灵(Turing)的方法而提出来的,其基本思想是,用观察计数较高的N元语法数重新估计概率量的大小,并把它指派给那些具有零计数或者较低计数的N元语法,具体使用公式如下: ... Web4. Good-Turing Smoothing. 大部分平滑算法比如Good-Turing、Kneser-Ney、Witten-Bell采用的主要思想是用之前已知的数据的计数来预测未知的数据的计数,旨在将未知的0值用其他数值替代。. 下面是具体方法:. 表示频率c出现的次数,然后将其应用到Good-Turing平滑算 … WebGood-Turing 估计适合单词量大并具有大量的观察数据的情况下使用, 在观察数据不足的情况下,本身出现次数就是不可靠的 ,利用它来估计出现次数就更不可靠了。 缺乏利用低元模型对高元模型进行线性插值的思想 。 显然, N 1 = N 2 。 或许这个方法解决不了自然语言处理问题,而且 n r = 0 时公式也 ... screen recorder for minecraft pe