mid_2008 - Midterm Exam CPSC 670, Spring 2008 8 questions;...

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Midterm Exam CPSC 670, Spring 2008 8 questions; 100 points total [15% of your Fnal grade] This midterm examination consists of 11 pages, 8 questions, and 100 points and counts for 15% of your Fnal grade. Please write your answers on the exam paper in the spaces provided. You may use the back of a page if necessary. You have 75 minutes to complete the exam. Examinations turned in after the end of the examination period will be either penalized or not graded at all. "On my honor, as an Aggie, I have neither given nor received unauthorized aid on this academic work." Name (printed): ____________________________________ Signature: ____________________________________ UIN: _________________________ Question Score Possible 1. Relevance feedback 12 2. K-means 15 3. T±-ID± 15 4. Coding 8 5. Evaluation 15 6. Phrase queries 6 7. Short answer 12 8. Inverted indexes 17 Total 100 Page 1 of 11
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Suppose that a user’s initial query is: aggie football tickets aggie basketball tickets aggie The user examines two documents, one of which she judges relevant and the other irrelevant, with the following content (not including the Frst word, which is her classiFcation): Relevant aggie football aggie athletics tickets Non-relevant texas aggie basketball conference Assume that we are using direct term frequency (with no scaling and no document frequency). There is no need to length-normalize vectors. Using the Rocchio (1971) relevance feedback, as implemented in SMART, what would the revised query vector be after relevance feedback? Assume α = 1, β = 0.75, γ = 0.25. Page 2 of 11
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mid_2008 - Midterm Exam CPSC 670, Spring 2008 8 questions;...

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