mid_2009 - Midterm Exam CPSC 670, Spring 2009 7 questions;...

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Page 1 of 9 Midterm Exam CPSC 670, Spring 2009 7 questions; 100 points total [15% of your final grade] This midterm examination consists of 9 pages, 7 questions, and 100 points and counts for 15% of your final 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. Short answer 20 2. Index construction 12 3. Vector space retrieval 12 4. Spell correction 12 5. Hubs and authorities 12 6. Collaborative filtering 12 7. Twitter 20 Total 100
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Page 2 of 9 1. Short Answer (20 points) a. What is “Heaps’ law”? Write the formula and explain in a sentence or two why it is important to our study of Information Retrieval. Present at least one concrete impact of Heaps’ law on the design of an IR system. b. Why is the length of a document vector typically not an important factor in vector space retrieval? c. Name and briefly define two common challenges we may face in building a collaborative- filtering based recommender system. Challenge 1: Challenge 2: d. In our study of the Web, we observed that the Web follows a bowtie structure. Sketch a picture of the Web’s bowtie and label the important parts.
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Page 3 of 9 2. Index Construction (12 points) Graphically illustrate with a simple table and linked list diagrams, the basic inverted index
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This note was uploaded on 01/21/2011 for the course CSCP 689 taught by Professor James during the Spring '10 term at Texas A&M.

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mid_2009 - Midterm Exam CPSC 670, Spring 2009 7 questions;...

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