Something inside has to change

The last module ended with a different idea. Instead of writing every decision as a rule, people could show a machine examples with the correct answers attached.

But examples cannot teach anything unless something changes after a mistake.

A light switch has two fixed positions: off and on. A dimmer can move through all the positions between them.

Researchers needed something more like the dimmer. They needed adjustable parts inside the machine, parts that could move a little after each wrong answer.

For inspiration, some of them looked toward the brain. They borrowed one small idea from its connected cells and built a much simpler mathematical version: the artificial neuron.

Move the control. The important idea is not the light itself. It is that the setting can change.

Something inside has to change

The last module ended with a different idea. Instead of writing every decision as a rule, people could show a machine examples with the correct answers attached.

But examples cannot teach anything unless something changes after a mistake.

A light switch has two fixed positions: off and on. A dimmer can move through all the positions between them.

Researchers needed something more like the dimmer. They needed adjustable parts inside the machine, parts that could move a little after each wrong answer.

For inspiration, some of them looked toward the brain. They borrowed one small idea from its connected cells and built a much simpler mathematical version: the artificial neuron.

Move the control. The important idea is not the light itself. It is that the setting can change.