Architect

Oct 18, 2021 · Fundamentals

Understanding Simhash: From Traditional Hash to Random Projection and LSH

This article explains the principles behind Simhash, covering the shortcomings of traditional hash functions, the use of cosine similarity, random projection for dimensionality reduction, locality‑sensitive hashing, random hyperplane hashing, implementation steps, query optimization with the pigeonhole principle, and the algorithm's limitations in short‑text scenarios.