The signals · The accuracy · Element

The threshold

How confident the inference has to be before it is used.

The part

What it is

Below the threshold, show the default rather than a guess. This is straightforward and is frequently not implemented.

It also improves the average experience, since a confident wrong personalisation is worse than a neutral one.

The smallest level

The attributes it carries

Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.