Information Retrieval - Question paper 2074

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Attempt any ten questions.

1. How IR in web search is different from other IR systems? Discuss IR architecture with suitable example.

2+4 Marks

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2. Assume that document space is defined by four terms: Network, CSIT, Nepal, TU and Graduate. And we have three documents containing the following terms:

Doc1: CSIT Nepal

Doc2: TU CSIT

Doc3: CSIT TU Nepal

If the query is "CSIT NEPAL", find top 2 documents retrieved by Boolean space model

6 Marks

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3. What is meant by stop word removal? Explain text normalization with suitable example. 

1+5 Marks

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4. Suppose the table given below lists all the documents retrieved by an algorithm. If total number of relevant documents is 6, calculate the value of recall, precision, and F-score.


sn
Doc ID
relevant
1
D1no
2D2no
3D3yes
4D4no
5D5yes
6D6yes
7D7no
8D8no
9D9yes


6 Marks

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5. Why query expansion is important? Discuss query expansion techniques with examples.

1+5 Marks

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6. Why Hits algorithm is used? Discuss its working with example.

2+4 Marks

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7. How Bots are different from spiders? Describe simple and multithreded spidering algorithm.

1+5 Marks

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8. How text categorization is different from clustering? Explain nearest neighbor categorization algorithm.

1+5 Marks

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9. Differentiate collaborative filtering from content based filtering? Discuss content based recommender system with its strengths and drawbacks

2+4 Marks

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10. Why TF-IDF weighting is important in information retrieval? Explain with suitable example.

6 Marks

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11. How information extraction differs from information retrieval? Discuss role of XML in information extraction.

6 Marks

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