15381-assignment2 - Homework 2 for Artificial Intelligence...

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Homework 2 for Artificial Intelligence Class (15-381) due: Friday, February 28, 2003, before midnight Friday, February 14, 2003 Question 1. Information Retrieval (Vector Space Model): [20 points] (1) Decide 6 words to count in the vector for the text below, assuming that the text is being indexed in an information retrieval system specifically for successful business (Hint: eliminate the stop-words and select the words with high frequency and meaningful for retrieval). Briefly explain why you choose the 6 words. Any answer with appropriate explanation will get the credit. [2 points] “Opening a successful business is much like trying to build a rocket to hit the moon. All you need to succeed is Knowledge. However, it is much easier to succeed in business than to be a rocket scientist. Few would consider building a rocket to Mars in their garage or from their bedroom, but many expect to become millionaires off the revenue from home-based businesses or businesses started in their garage. With a lot of knowledge and a little bit of luck, success is possible.” (2) Given a 10-word vocabulary, “moon, lunar, science, rocket, aerospace, aviation, engine, earth, cosmonaut, spacecraft”, create the vector for each of the six documents below. [5 points] (3) Using the same vocabulary, create the vector for each of the two queries, “moon, lunar, earth” and “moon, aerospace, rocket”. [5 points] (4) Compute the dot product similarity and cosine similarity between each query vector and each document vector. Determine the closest document to each query according to the dot product similarity, and determine the closest document to each query according to the cosine similarity. Are they different? [8 points] 1. The Moon program was the last "love affair" for Russian aviation designer Sergey Korolev, who dreamed of interplanetary exhibitions. A group of soviet cosmonauts with Aleksey Leonov (the first spacewalker in history) at the head was set up especially for flying to the Moon.
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2. Nissan's aerospace division dates to 1953 and has had an important role in developing Japan's solid-fuel rocket engines. Development of the 92 ft. long, 5.5 ft. wide MU-3S-2
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15381-assignment2 - Homework 2 for Artificial Intelligence...

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