Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

positional encoding

Information added to a token's representation so a model that otherwise ignores order can tell positions apart.

Examples

Without positional encoding, a Transformer would treat "dog bites man" and "man bites dog" identically -- order carries no signal on its own.