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Cosine Similarity
- A document can be represented by thousands of attributes, each recording the frequency of a particular word (such as keywords) or phrase in the document.

- Other vector objects: gene features in micro-arrays, …
- Applications: information retrieval, biologic taxonomy, gene feature mapping, ...
- Cosine measure: If d1 and d2 are two vectors (e.g., term-frequency vectors), then
cos(d1, d2) = (d1 ⋅ d2) /||d1|| ||d2|| ,
where ⋅ indicates vector dot product, ||d||: the length of vector d
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