phrase query in information retrieval

The Phrase Query for Information Retrieval. Triyah Fatmawatia) Badrus Zamanb)

Positional postings and phrase queries. ? Preprocessing to form the term vocabulary. ? Documents. ? Tokenization. ? What terms do we put in the index?

in information retrieval particularly in commercial sys- tems. In previous work

24 avr. 2014 Center for Information and Language Processing University of Munich ... which documents match the phrase query “fools rush in”?

phrase queries is costly though

All these problems hurt a retrieval system in term of precision and recall. Given a query a retrieval system retrieves a set of documents as a response to the 

All these problems hurt a retrieval system in term of precision and recall. Given a query a retrieval system retrieves a set of documents as a response to the 

Longer phrase queries. • Longer phrases can be processed by breaking them down. • stanford university palo alto can be broken into the Boolean query on 

20 juin 2019 expanding both the individual and the phrase query terms. ... Keywords: Query Expansion Information Retrieval

Introduction to Information Retrieval Query processing At this point we have an enumeration of all terms in the dictionary that match the wild-card query We still have to look up the postings for each enumerated term E g consider the query: se*ate AND fil*er This may result in the execution of many Boolean AND queries Sec 3 2 13

Introduction to Information Retrieval Information Retrieval §Information Retrieval (IR) is finding material(usually documents) of an unstructurednature (usually text) that satisfies an information needfrom within large collections(usually stored on computers)

Information Retrieval Handling phrase queries Phrase queries We want to answer a query such as [stanford university] –as a phrase Thus The inventor Stanford Ovshinsky never went to university should notbe a match The concept of phrase query has proven easily understood by users About 10 of web queries are phrase queries

CS3245*–Information*Retrieval Query-processing-with-skip-pointers Information-Retrieval 7 2 4 8 41 48 64 128 CS3245*–Information*Retrieval Phrase-queries!

Introduction to Information Retrieval Introduction to Information Retrieval Terms The things indexed in an IR system Introduction to Information Retrieval Stop words With a stop list you exclude from the dictionary entirely the commonest words Intuition: They have little semantic content: the a and to be

query syntaxtree is naturally de?ned Consider the example of a query syntax tree below AND ORtranslation syntax syntactic It will retrieve all the documents which contain the translationas well as either the wordsyntax wordsyntactic word or the oolean Queries The operators most commonly used given queries or boolean sub-expressionse1and two