org.terrier.matching.taat
Class FullNoPLM

java.lang.Object
  org.terrier.matching.BaseMatching
      org.terrier.matching.taat.FullNoPLM

All Implemented Interfaces:

Matching

public class FullNoPLM
extends BaseMatching

An exhaustive term-at-a-time approach for matching documents to a query. Posting lists for terms are processed in a sequential manner, i.e. the postings for a given query terms are scored before scoring commences on the next term in the query. In this class, all postings for all query terms are scored. After matching, the document score modifiers are applied if necessary.

The nature of scoring by taat.Full means that it can consume large amounts of memory for scoring large indices. If this is a problem or concern, use daat.Full instead.

Since:

3.0

Author:

Nicola Tonellotto, Craig Macdonald

See Also:

Full, Matching

Field Summary

Fields inherited from class org.terrier.matching.BaseMatching

collectionStatistics, documentModifiers, dsmNamespace, IGNORE_LOW_IDF_TERMS, index, invertedIndex, lexicon, logger, MATCH_EMPTY_QUERY, numberOfRetrievedDocuments, queryTermsToMatchList, resultSet, RETRIEVED_SET_SIZE, totalTime, wm

Constructor Summary

FullNoPLM(Index index)
Create a new Matching instance based on the specified index

Method Summary

protected void	assignScores(int i, WeightingModel[] wModels, AccumulatorResultSet rs, IterablePosting postings)
java.lang.String	getInfo() Return a human readable description of this Matching class
ResultSet	match(java.lang.String queryNumber, MatchingQueryTerms queryTerms) Get a ResultSet for the given query terms.

Methods inherited from class org.terrier.matching.BaseMatching

finalise, getTotalTime, initialise, initialisePostings, setCollectionStatistics, updateEndTime, updateStartTime

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FullNoPLM

public FullNoPLM(Index index)

Create a new Matching instance based on the specified index

Method Detail

getInfo

public java.lang.String getInfo()

Return a human readable description of this Matching class

Specified by:

getInfo in interface Matching

Specified by:

getInfo in class BaseMatching

match

public ResultSet match(java.lang.String queryNumber,
                       MatchingQueryTerms queryTerms)
                throws java.io.IOException

Get a ResultSet for the given query terms.

Specified by:

match in interface Matching

Specified by:

match in class BaseMatching

Parameters:

queryNumber - - some ID of the query

queryTerms - - query terms to match

Returns:

ResultSet - the matched results

Throws:

java.io.IOException - if a problem occurs during matching

assignScores

protected void assignScores(int i,
                            WeightingModel[] wModels,
                            AccumulatorResultSet rs,
                            IterablePosting postings)
                     throws java.io.IOException

Throws:

java.io.IOException