All terms
Evaluation
Regression Test
A repeatable check that a change did not make previously working behavior worse.
Definition
A regression test is a repeatable check that confirms a change has not broken behavior that previously worked. In machine learning it often means rerunning a fixed set of prompts or benchmarks after updating a model, prompt, or pipeline and comparing results to a known baseline. It catches silent quality drops and is a routine part of maintaining models and applications.