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INF 2914 Information Retrieval and Web Search

INF 2914 Information Retrieval and Web Search

INF 2914 Information Retrieval and Web Search. Lecture 6: Index Construction These slides are adapted from Stanford’s class CS276 / LING 286 Information Retrieval and Web Mining. (Offline) Search Engine Data Flow. Parse & Tokenize. Global Analysis. Index Build. Crawler. Dup detection

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712 views • 55 slides
CS276A Information Retrieval

CS276A Information Retrieval

CS276A Information Retrieval. Lecture 5. Plan. Last lecture: Tolerant retrieval Wildcards Spell correction Soundex This time: Index construction. Matching trigrams. Consider the query lord – we wish to identify words matching 2 of its 3 bigrams ( lo, or, rd ). lo. alone. lord.

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582 views • 45 slides
Information Retrieval

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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581 views • 45 slides
Index construction

Index construction

Index construction. 4 장. 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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731 views • 44 slides
Information Retrieval

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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353 views • 25 slides

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