Implement multi-head attention from scratch.

Single-head attention shows up often; multi-head layers on the split-into-heads, attend-per-head, concatenate pattern. What gets scored is the reshape into heads plus a sharp explanation of why several heads help. Here is the implementation.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.