Vyhľadávanie informácií08.11.20071 Softvérové knižnice a systémy Vyhľadávanie informácií Michal Laclavík.

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Presentation transcript:

Vyhľadávanie informácií Softvérové knižnice a systémy Vyhľadávanie informácií Michal Laclavík

Vyhľadávanie informácií Tools IR libraries & engines –Lucene –Egothor –Xapian –mnoGoSearch Lucene –Nutch –Porty –SearchBlox

Vyhľadávanie informácií Lucene Indexing IndexWriter Directory –FSDirectory, RAMDirectory Analyzer Document –Collection of fields Field –Keyword, UnIndexed, UnStored, Text

Vyhľadávanie informácií Lucene Indexing 2 Indexing Dates Boosting –Field.setBoost Indexing Numbers –Adding zeros, Analyzers Sorting –Not tokenized, Field Keyword Directory –FSDirectory, RAMDirectory Term vector –Field.Unstored(“subject”,subject,true);

Vyhľadávanie informácií Lucene Searching IndexSearcher Term Query –Boolean, Phrase, Prefix, Range, Fuzzy (levenstein) TermQuery Hits

Vyhľadávanie informácií Lucene Searching 2 Query q = QueryParser.parse(“search”, “field”, new SimpleAnalyzer()); –+pubdate:[ TO ] Java AND (Jakarta OR Apache) –Query.toString() Scoring –Similarity, DefaultSimilarity Sorting –By field, by multiple MultiFieldQueryParser Filtering

Vyhľadávanie informácií Lucene Searching 3 Custom Sort Method –Distance search

Vyhľadávanie informácií Lucene Analysis XY&Z Corporation – WitespaceAnalyzer –[XY&Z] [Corporation] [–] SimpleAnalyzer – kills numbers –[XY] [Z] [corporation] [xyz] [example] [com] StopAnalyzer –[XY] [Z] [corporation] [xyz] [example] [com] StandardAnalyzer –[XY&Z] [corporation]

Vyhľadávanie informácií Lucene Analysis 2 Indexing Querying –Query parse, QueryTerm not Analyzed Results –Tokens, position type –Terms, position TokenStream, Tokenizer, TokenFilter

Vyhľadávanie informácií Lucene Analysis 3 Synonyms, aliases –Same position (phrase query) UTF-8 –Kodovania, znaky HTML –Content-type Nutch analysis –The quick

Vyhľadávanie informácií SandBox Development tools –Lucli CLI –Luke – toolbox SnowBall analyzer T9 indexing example Highlite BerkleyDB

Vyhľadávanie informácií Lucene Doc format XML –SAX parser Xserces –Digester Apache Jakarta PDF –PDFBox.org –Buildin support HTML –JTidy.sf.net –NekoHTML Word –POI – jakarta project –TextMining.org RTF –Javax.swing.text.rtf

Vyhľadávanie informácií Tools DocSearcher Docco SearchBlox

Vyhľadávanie informácií Lucene Ports CLucene dotLucene Plucene Perl Lupy Python PyLucene GCJ + SWIG

Vyhľadávanie informácií Nutch Build on lucene Fetcher, searcher interface Scalable to several bilions Ranking ??? Hadoop –Implementacia MapReduce

Vyhľadávanie informácií Other Use cases JGuru SearchBlox Alias-i

Vyhľadávanie informácií Linux tools Catdoc –Xsl, doc –openoffice Pdftotext (XPDF) Encoding –enca

Vyhľadávanie informácií Ine kniznice QTag –POS tagging Stemming –Snowball –Potter –Tvaroslovnik, JULS SimMetrics –Podobnosti, levenstein, cosmiera GATE