Lesson 4: Masking, built, tested and broken on purpose

Module 2 · Lesson 4 · About 50 minutes · Needs: Module 2, Lessons 1 and 2 (naive_attention, its mask argument, the copy task)

The situation

Sol 405 at Aurora Station. naive_attention has had a mask argument since Lesson 1, but the lab has only ever passed the causal triangle. Kofi Mensah sets a rule: "A name's outputs must not depend on its neighbours in a batch, or on what comes after it. Test each mask, and show me what leaks when one is wrong."

The running example is two crew names in the shared character tokeniser: Maya (ids 32, 45, 68, 45) and Tariq (39, 45, 61, 53, 60). You will batch, pad and pack them, and measure every leak.