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 30
Introduction to Information Retrieval Binary incidence matrix Anthony and Cleopatra Julius Caesar The Tempest Hamlet Othello Macbeth . . . ANTHONY BRUTUS CAESAR CALPURNIA CLEOPATRA MERCY WORSER . . . 1 1 1 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 1 1 0 0 1 0 0 1 1 1 0 1 0 0 1 0 Each document is represented as a binary vector ∈ {0, 1} |V|. 31 31
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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 />
30
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