Introduction to Information Retrieval
Introduction to Information Retrieval
Introduction to Information Retrieval
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<strong>Introduction</strong> <strong>to</strong> <strong>Information</strong> <strong>Retrieval</strong><br />
How do we formalize vec<strong>to</strong>r space similarity?<br />
• First cut: (negative) distance between two points<br />
• ( = distance between the end points of the two vec<strong>to</strong>rs)<br />
• Euclidean distance?<br />
• Euclidean distance is a bad idea . . .<br />
• . . . because Euclidean distance is large for vec<strong>to</strong>rs of<br />
different lengths.<br />
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