Mastering: EER {value_pct} at epoch {epoch} — down at least three quarters from its first reading.
Epoch {epoch}: EER {value_pct}, a change of {delta_pct} points since the previous reading. It is now a quarter of its first reading, or less.
Far along: EER {value_pct} at epoch {epoch}, at or within 1% of the best this run has reached.
