Introduction to Information Retrieval
Introduction to Information Retrieval Introduction to Information Retrieval
Introduction to Information Retrieval Outline ❶ Recap ❷ Why ranked retrieval? ❸ Term frequency ❹ tf-idf weighting ❺ The vector space model 18
Introduction to Information Retrieval Frequency in document vs. frequency in collection • In addition, to term frequency (the frequency of the term in the document) . . . • . . .we also want to use the frequency of the term in the collection for weighting and ranking. 19
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<strong>Introduction</strong> <strong>to</strong> <strong>Information</strong> <strong>Retrieval</strong><br />
Outline<br />
❶ Recap<br />
❷ Why ranked retrieval?<br />
❸ Term frequency<br />
❹ tf-idf weighting<br />
❺ The vec<strong>to</strong>r space model<br />
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