Lesson 2: Question answering: finding the exact words that answer

Module 8 · Lesson 2 · About 50 minutes · Needs: basic Python; semantic search over the help centre (Module 6 Lesson 4) and subword tokens (Module 2) help; this lesson loads its own models

The situation

It is Tuesday 27 October 2026, project week 8. A Volt 2 owner has found VB-0426 on the label under her battery and asks Ines: "How long does a battery swap take at the workshop?" Module 6's search suggests articles, but even the right one, KB05, is 168 words to read for the four that answer: "about 20 minutes".

This lesson builds a reader, a model that picks the answer out of an article, joins it to Module 6's search, and scores it on 40 labelled questions, including when to say nothing (simulated data).