primeCrossAttn method
Pre-project encoder memory xa: [B, T_audio, C] (B == 1 in
practice) into this block's cross-attention K and V. Must be
called once per audio clip before call.
Implementation
void primeCrossAttn(Tensor xa) {
final b = xa.shape[0];
final t = xa.shape[1];
final c = xa.shape[2];
final flat = xa.reshape([b * t, c]);
_crossK = [for (final h in crossKHeads) h(flat)];
_crossV = [for (final h in crossVHeads) h(flat)];
}