Cosine Similarity

• a type of Similarity Measure that measures the similarity (or angle) between 2 vectors
• the similarity is scored between an interval [-1, 1]:
  • proportional vectors have a cosine similarity of 1
  • orthogonal vectors have a cosine similarity of 0 (see proof)
  • opposite vectors have a cosine similarity of -1
• when dealing with positive-only vectors, the similarity is scored between an interval [0, 1]

Cosine Similarity - Formula

Subpages

• Dot Product vs Cosine Similarity
• Why Dot Product of 2 Orthogonal Vectors Equals Zero? (Cosine Similarity)