The Attention Mechanism

Attention is the mechanism that allows a transformer to understand context. When you read the sentence "The bank of the river was muddy," your brain instantly resolves "bank" as a riverbank, not a financial institution. Attention is how a transformer does the same thing — by looking at surrounding words to determine meaning.

The mathematical formulation is elegantly simple: Attention(Q, K, V) = softmax(QKᵀ/√d_k)V

Let's break down exactly what this means.