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Cosine similarity

simcos(x⃗,y⃗)=cos⁡θ=x⃗⋅y⃗∥x⃗∥∥y⃗∥sim_{cos}(\vec{x} , \vec{y}) = \cos\theta = \frac{\vec{x} \cdot \vec{y} }{\parallel \vec{x} \parallel \parallel \vec{y} \parallel}