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In computer science, an inverted index (also referred to as a postings list, postings file, or inverted file) is a database index storing a mapping from content, such as words or numbers, to its locations in a table, or in a document or a set of documents (named in contrast to a forward index, which maps from documents to content). [1]
Using this inverted index, one can find for any word the set of Wikipedia articles containing this word; in the vocabulary of Egozi, Markovitch and Gabrilovitch, "each word appearing in the Wikipedia corpus can be seen as triggering each of the concepts it points to in the inverted index." [1] The output of the inverted index for a single word ...
The forward index is sorted to transform it to an inverted index. The forward index is essentially a list of pairs consisting of a document and a word, collated by the document. Converting the forward index to an inverted index is only a matter of sorting the pairs by the words. In this regard, the inverted index is a word-sorted forward index.
The goal of the problem is to identify a set of matches given a corpus to search and a query of keyword terms to match against. This problem is commonly solved through inverted indexes, where each searchable item is maintained with a map of keywords. [3] In contrast, BitFunnel represents each searchable item through a signature.
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In database management systems, a reverse key index strategy reverses the key value before entering it in the index. [1] E.g., the value 24538 becomes 83542 in the index. Reversing the key value is particularly useful for indexing data such as sequence numbers , where each new key value is greater than the prior value, i.e., values ...
In computer science, an inversion list is a data structure that describes a set of non-overlapping numeric ranges, stored in increasing order.. The set is stored in an array.