inverted index tutorial

Article transferred from: http://blog.csdn.net/hguisu/article/details/7962350 Search engine index 1. Word-document Matrix Word-document matrix is a conceptual model that expresses the inclusive relationship between the two. Figure 3-1 shows its meaning. Each column in Figure 3-1 represents a document, each line represents a word, and the position of the check mark represents the inclusion relationship. Figure 3-1 word-document Matrix From the vertic

Tags: columnstore www reading monitor infoq cas level ISP selectionThe time series database is the largest and most widely used. This type of storage is commonly referred to when people talk about time series databases. Depending on the underlying technology, it can be divided into three categories. Straightforward file-based storage: RRD Tool,graphite Whisper. This type of tool is attached to the Monitoring alarm tool, and there is no regular database engine at the bottom. Simply there is

the use of inverted indexes The key step of the search engine is to set up an inverted index, the so-called inverted index is generally expressed as a keyword, followed by its frequency (the number of occurrences), location (in which article or page, and the date, author and

1. Word-document Matrix The common search scenario is to give several keywords and find the documents containing the keywords.How to quickly find a document containing a keyword becomes the key to search. With the help of the word-document matrix model, we can easily know which words are contained in a document and which documents contain a word. The search engine index is actually the specific data structure of the word-document matrix, including

1. IntroductionThe inverted index stems from the fact that a record needs to be found based on the value of the property . Each entry in this index table includes an attribute value and the address of each record that has that property value . Because the property value is not determined by the record, it is determined by the property value to determine the posit

Word document Matrix (search engine index is actually the implementation of "word-document Matrix" concrete data structure) Inverted index Basic Concepts Document: The general search engine is dealing with the Internet Web page, and the concept of the document is more broad, representing the existence of text-based storage objects, compared to the Web page, cove

http://blog.csdn.net/hguisu/article/details/7962350http://blog.csdn.net/hguisu/article/details/7969757===================== I'm a split line =============================Inverted Index (English: Inverted index), also often referred to as a reverse index, place file , or reve

The inverted index technology is mainly used for full-text search. By analyzing non-primary keywords, the key between content and PK is established. Index file 4 F3 B $ g, v, k * @ "W n + H Storage is provided to the application for efficient retrieval .) M ^ 1 S6 S/f * n # P If you need to customize the inverted

Inverted index (English: Inverted index), also known as reverse index, put into a file or reverse file, is an index method, it is used to store the ing of a word stored in a document or a group of documents in full-text search. It

Index compression (compression ratio vs decompression efficiency) It is mainly used to encode and compress the inverted list (postings list) in the inverted index. Encoding method: 1. d-gaps:Encode sequential numbers (such as docid) by difference (D-gaps. (Processing small data requires a small amount of code and pro

The location information index is implemented on the basis of inverted indexes, where information about the position of the word item in the document is added to the inverted record table. Location information is typically stored in the inverted record in the following way: Document ID: (location 1, location 2, ...) ）

Inverted indexes inverted index, the first contact is in the elasticsearch inside, the index is used this, in fact, ES is also used lucene for the bottom, inverted index is the core algorithm of Lucene.Online, "

Introduction to the document inverted algorithm Inverted index (inverted index) is a data structure that is currently dependent on almost all search engines that support full-text indexing. Based on the index structure, give a wo

Inverted indexThe inverted index stems from the fact that a record needs to be found based on the value of the property. Each entry in this index table includes an attribute value and the address of each record that has that property value. Because the property value is not determined by the record, it is determined by