For a transformer decoder, how exactly are K, Q, and V for each decoding step? Assume my input prompt is "today is a" (good day). At t= 0 (generation step 0): K, Q, and V are the projections of the sequence ("today is a") Then say the next token generated is "good". At `t=1` (generation step 1): Which one is true: 1. K, Q, and V are the projections of the sequence ("today is a good") 2. K, Q, are the projections of the sequence ("today is a"), and V is the projection of the sequence ("good")?