Embedding validity time

An embedding or feature computed months ago may no longer represent today's semantics. The datum has two times — when the event happened and when the representation was valid — and joining on the wrong one drifts the model.

Class

Case to account for

Affects

1 conversion

Detection

A feature/embedding lacks a 'valid-as-of' time distinct from the event time.

Mitigation

Store the representation's valid-as-of time alongside the event time; expire or recompute stale embeddings.

Affected conversions

semantics

OPEN