call method
Implementation
Tensor call(Tensor x) {
final attnOut = attention(x);
final h = attentionOutputLn(x + attnOut);
// Tanh-approx GELU matches exact GELU to < 2e-4 abs on [-6, 6];
// fine for sentence-embedding retrieval.
final ffnOut = output(_geluTanh(intermediate(h)));
return outputLn(h + ffnOut);
}