Information Retrieval - ad-teaching.infor...

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Synonyms 2/4• Solution 1: Maintain a thesaurus– Hand-maintain a thesaurus of synonymsuniversity: uni, ac<strong>ad</strong>emy, college, ...bringdienst: lieferservice, heimservice, pizzaservice, ...cookie: biscuit, confection, wafer, ...– Problem 1: laborious, yet notoriously out of date– Problem 2: it depends on the context, whichsynonyms are appropriateuniversity award ≠ ac<strong>ad</strong>emy awardhttp cookie ≠ http biscuit– Anyway, that's not the topic of today's lecture ...6
Synonyms 3/4• Solution 2: Track user behaviour– Investigate not just individual searches but wholesearch sessions (tracked using, guess what, cookies):The initial queryThe subsequent queriesWhat the user eventually clicked on– Interesting, but not the topic of today's lecture either ...7
Page 1 and 2: Information RetrievalWS 2012 / 2013
Page 3 and 4: Experiences with ES#7 (cookies, UTF
Page 5: Synonyms 1/4• Problem: another so
Page 9 and 10: Latent Semantic Indexing 1/9• An
Page 11 and 12: Latent Semantic Indexing 3/9• If
Page 13: Latent Semantic Indexing 5/9• Eig
Page 17: Latent Semantic Indexing 8/9• Wit
Page 20 and 21: Octave 2/5• Use the Octave shell
Page 22 and 23: Octave 4/5• Sparse matrices- Our
Page 24: References• Further reading- Text

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