The big picture
One caretaker's log ran through every lesson. Eight ideas, each with one number you can check.
| Idea | Remember | Example |
|---|---|---|
| Holding a rule instead | Two weights and a threshold, kept instead of a pile of days. | Gauge 6, days 0 → rule says wait |
| The weighted sum | Each input times its own weight, then added. | 6 × 6 + 1 × 4 = 40 |
| The line it crosses | At or past the threshold calls; under it waits. | 28 of 63 days call |
| Measuring one wrong | A count needs its denominator, from a real walk. | Missed 2 of the 4 kept-back |
| Nudging the weights | Each weight moves by the nudge times its own input. | 6 + 6 = 12, 4 + 0 = 4 |
| Counting what moved | Guess, compare, count, nudge, again. A count over a few days can hide what a nudge broke. | Kept-back misses 2, 1, 0 of 4. All 12 days: 2, 3, 1 |
| Write the sum yourself | Two functions: the weighted sum, then the at-or-past check. | Sum 36, decide → wait |
| What the word neural buys | A neuron here is one unit. It adds inputs times weights, then compares the sum to a threshold. A network is many units joined. This track built one unit. | No brain claim, no product |
The finished rule gets 11 of 12 days right. One day cannot be fixed. Gauge 5, days 3 sums the same both times. The caretaker gave those two days different words. Two weights and a threshold cannot give two answers for one sum.
You stored a rule and moved it yourself. Your next track is AI Ethics & Society. It asks who chose the weights, and who a guess affects.