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INF 2914 Information Retrieval and Web Search

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CS276A Information Retrieval

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Information Retrieval

Information Retrieval. Lecture 5. Recap of last time. Postings pointer storage Dictionary storage Compression Wild-card queries. This lecture. Query expansion What queries can we now process? Index construction Estimation of resources. Spell correction and expansion. Expansion.

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Index construction

Index construction. 4 ?. Plan. Tolerant retrieval Wildcards Spell correction Soundex This time: Index construction. Index construction. How do we construct an index? What strategies can we use with limited main memory?. Our corpus for this lecture. Reuters-RCV1 collection

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Information Retrieval

Information Retrieval. IR 4. Plan. This time: Index construction. Index construction. How do we construct an index? What strategies can we use with limited main memory?. Recall our corpus. Number of docs = n = 1M Each doc has 1K terms Number of distinct terms = m = 500K

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