'Dictionary headword form' diaporamas de présentation

CS276 Information Retrieval

CS276 Information Retrieval. Lecture 2. Recap of the previous lecture. Basic inverted indexes: Structure: Dictionary and Postings Key step in construction: Sorting Boolean query processing Simple optimization Linear time merging Overview of course topics. Plan for this lecture.

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Lecture 3: The term vocabulary and postings lists

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Dictionary and Postings; Query Processing

Dictionary and Postings; Query Processing. Adapted from Lectures by Prabhakar Raghavan (Yahoo and Stanford) and Christopher Manning (Stanford). This lecture agenda. Difficulties with tokenization Improving efficiency using enhanced data structures and algorithms : Skip pointers

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Dictionary and Postings; Query Processing

Dictionary and Postings; Query Processing. Adapted from Lectures by Prabhakar Raghavan (Yahoo and Stanford) and Christopher Manning (Stanford). Tokenizer. Friends. Romans. Countrymen. Token stream. Linguistic modules. friend. friend. roman. countryman. Modified tokens. roman.

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IR: The not-so-exciting part

IR: The not-so-exciting part. Documents to be indexed. Friends, Romans, countrymen. Tokenizer. Friends. Romans. Countrymen. Token stream. Linguistic modules. friend. roman. countryman. Modified tokens. 2. 4. friend. Indexer. 1. 2. roman. Inverted index. 16. 13. countryman.

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