The mechanism, without mathematics.
THE BASIC IDEA
Show a system many examples. It finds patterns in them. It then applies those patterns to new input.
AN ANALOGY
A person who has read ten thousand medical reports develops an instinct for what a normal one looks like.
They cannot always articulate the rule. They recognise the pattern.
Machine learning systems work similarly, at scale.
WHAT TRAINING MEANS
Adjusting internal values repeatedly until the system's output matches the examples well enough.
That process is computationally expensive and happens once, before you use the system.
WHAT HAPPENS WHEN YOU USE IT
The trained system takes your input and produces output based on the patterns it learned.
Fast, and it involves no learning. The system does not remember your conversation after it ends unless designed to.
WHY IT SOMETIMES FAILS
It learned patterns from its training data. Input unlike anything it saw produces unreliable output.
It has no way of knowing it is wrong.
THE PRACTICAL IMPLICATION
AI output is a prediction, not a lookup. Treat it accordingly.