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Friday, 18 June 2021

List down the common global resources for query expansion

List down the global resources applicable for query expansion, what are the resources useful for query expansion or query reformulation, how does query expansion is achieved? global method for improving recall of an information retrieval system

 

Question:

List down the common resources for query reformulation / expansion

 

Answer:

Query expansion is a global method for query reformulation. It is used for adding related words to a query in order to increase the number of returned documents and improve recall accordingly. It often referred as “global query expansion”. As the method uses global resources such as thesaurus and query logs that are not usually query dependent, it is referred to as “global query expansion”. Query expansion uses the following global resources for query reformulation;

1. Controlled vocabulary

There is a canonical term for each concept; all other terms for the same concept are replaced by the canonical term

2. Manual thesaurus

Human annotators build sets of synonymous terms for concepts. Example: PubMed.

3. Automatically generated thesaurus

Attempt to generate a thesaurus automatically by analyzing the distribution of words in documents

4. Query log mining

Query logs are maintained by each search engine in order to analyze the behavior of the user while interacting with search engine. These kind of approaches use these query logs to analyze the user’s preference and adds corresponding terms to query.

 

 

Related links/sources

 

 

 

Keywords

Query expansion techniques

Query expansion methods in information retrieval

Query expansion techniques for question answering

Query expansion to improve document retrieval

Global query expansion how to do

Global methods for improving recall of an IR system

Improve the effectiveness of information retrieval

Global option for improving the recall

What is global query expansion?

Why query expansion is referred to as global method?

 

 

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