Data Science & ML
Intermediate

Cosine Similarity

Measures similarity between two vectors by the angle between them.

Formula

cos⁡θ=A⋅B∥A∥∥B∥\cos\theta = \frac{A \cdot B}{\|A\|\|B\|}

Variables

A,BVectors
\A\

Example

Identical direction gives 1, orthogonal gives 0

Did You Know?

Cosine similarity ignores magnitude, making it ideal for text embeddings.

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