WebDiscounted cumulative gain is a measure of ranking quality. In information retrieval, it is often used to measure effectiveness of web search engine algorithms or related … WebDiscounted cumulative gain ( DCG) is a measure of ranking quality. In information retrieval, it is often used to measure effectiveness of web search engine algorithms or related applications. Using a graded relevance scale of documents in a search-engine result set, DCG measures the usefulness, or gain, of a document based on its position in ...

推荐系统研究中常用的评价指标 - 知乎

WebMar 17, 2024 · 概念. NDCG，Normalized Discounted cumulative gain 直接翻译为归一化折损累计增益，可能有些晦涩，没关系下面重点来解释一下这个评价指标。. 这个指标通常是用来衡量和评价搜索结果算法（注意这里维基百科中提到了还有推荐算法，但是我个人觉得不太适合推荐算法 ... Web概念. NDCG，Normalized Discounted cumulative gain 直接翻译为归一化折损累计增益，可能有些晦涩，没关系下面重点来解释一下这个评价指标。. 这个指标通常是用来衡量 … overriding css

Discounted cumulative gain - Wikiwand

Discounted cumulative gain (DCG) is a measure of ranking quality. In information retrieval, it is often used to measure effectiveness of web search engine algorithms or related applications. Using a graded relevance scale of documents in a search-engine result set, DCG measures the usefulness, or gain, of a document based on its position in the result list. The gain is accumulated from the top of the result list to the bottom, with the gain of each result discounted at lower ranks. Web解释：. Discounted Cumulative Gain： 考虑排序顺序的因素，使得排名靠前的item增益更高，对排名靠后的item进行折损。. 如果相关性分数r (i)只有（0，1）两种取值时，DCG@K有另一种表达。. 其实就是如果算法返回的排序列表中的item出现在真实交互列表中时，分子 … Web1. 排序问题. 如图 Fig.1 所示，在信息检索中，给定一个query，搜索引擎会召回一系列相关的Documents （通过term匹配，keyword匹配，或者semantic匹配的方法） ，然后便需要对这些召回的Documents进行排序，最后将Top N的Documents输出。. 而排序问题就是使用一个模型 f(q,d)来对该query下的documents进行排序，这个 ... overriding concern