'Word form complex ligatures' diaporamas de présentation

Instructor : Prof. Sumanta Guha

Information Retrieval and Data Mining (AT71.07) Comp. Sc. and Inf. Mgmt. Asian Institute of Technology. Instructor : Prof. Sumanta Guha Slide Sources : Introduction to Information Retrieval book slides from Stanford University, adapted and supplemented

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CS276: Information Retrieval and Web Search Pandu Nayak and Prabhakar Raghavan

CS276: Information Retrieval and Web Search Pandu Nayak and Prabhakar Raghavan Lecture 2: The term vocabulary and postings lists. Ch. 1. Recap of the previous lecture. Basic inverted indexes: Structure: Dictionary and Postings Key step in construction: Sorting Boolean query processing

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CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan

CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan Lecture 2: The term vocabulary and postings lists. Ch. 1. Recap of the previous lecture. Basic inverted indexes: Structure: Dictionary and Postings Key step in construction: Sorting

486 views • 48 slides

CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan

CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan Lecture 2: The term vocabulary and postings lists. Ch. 1. Recap of the previous lecture. Basic inverted indexes: Structure: Dictionary and Postings Key step in construction: Sorting

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Lecture 3: The term vocabulary and postings lists

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Document ingestion

Document ingestion. Tokenizer. Friends. Romans. Countrymen. Token stream. Linguistic modules. friend. friend. roman. countryman. Modified tokens. roman. Indexer. 2. 4. countryman. 1. 2. Inverted index. 16. 13. Recall the basic indexing pipeline. Documents to be indexed.

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Lecture 2: The term vocabulary and postings lists

Lecture 2: The term vocabulary and postings lists. Algorithm. Intersect( p 1 , p 2) 1 answer ? 2 while p 1 = nil and p 2 = nil 3 do if doc ID ( p 1) = doc ID ( p 2) 4 then Add( answer, doc ID ( p 1)) 5 p 1 ? next ( p 1) 6 p 2 ? next ( p 2)

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CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan

CS276: Information Retrieval and Web Search Christopher Manning and Prabhakar Raghavan Lecture 2: The term vocabulary and postings lists. Tokenizer. Friends. Romans. Countrymen. Token stream. Linguistic modules. friend. friend. roman. countryman. Modified tokens. roman. Indexer. 2.

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Information Retrieval

Information Retrieval. Lecture 2: The term vocabulary and postings lists. Plan for this lecture. Elaborate basic indexing Preprocessing to form the term vocabulary Documents Tokenization What terms do we put in the index? Postings Faster merges: skip lists

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