Cosine Similarity

A operation to measure the similarity between two Vector.

$S_C(A,B)=\cos (\theta )=\frac{A\cdot B}{||A||||B||}$

• Two proporitional vectors have a $S_C(A,B)=1$
• Two Orthogonal vectors have a $S_C(A,B)=0$
• Two Opposite vectors have a $S_C(A,B)=-1$