CS276A Information Retrieval. Lecture 4. Recap of last time. Index compression Space estimation. This lecture. “Tolerant” retrieval Wild-card queries Spelling correction Soundex. Wild-card queries. Wild-card queries: *. mon*: find all docs containing any word beginning “mon”.
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Can retrieve all words in range: nom ≤ w < non.
Exercise: from this, how can we enumerate all terms
meeting the wild-card query pro*cent?
This may result in the execution of many Boolean AND queries.
where $ is a special symbol.
Empirical observation for English.
Type your search terms, use ‘*’ if you need to.
E.g., Alex* will match Alexander.
Did you mean “flew from Heathrow”?
because no docs matched the query phrase.
How many “corrected” phrases will we enumerate in this scheme?
E.g., Herman becomes H655.
Will hermann generate the same code?
(SPELL(moriset) /3 toron*to) OR SOUNDEX(chaikofski)
britney AND spears
then you probably do need spelling correction, but you don’t need to keep on intersecting those two postings lists
Mikael Tillenius: Efficient Generation and Ranking of Spelling Error Corrections. Master’s thesis at Sweden’s Royal Institute of Technology. http://citeseer.ist.psu.edu/179155.html