Comment by lostmsu
2 hours ago
Which part of that is doing gating? I thought gate generally looks like
f_gate(x, y) = f(x) * y
for some f. In your case b is a constant hyperparameter though, e.g.
f_gate(x) = 4 * tanh(x / 4) * sigmoid(x)
So where's the gate?
In the linked "Kimi-K3 Technical Report [pdf]" paper, section 2.3 (Stable LatentMoE, p6) has the table with those equations on (top of p7, using β_1 for the gate branch and β_2 for the up branch). They talk specifically about the function in section 2.3.2 (Sigmoid Tanh Unit GLU, bottom of p7).
Figure 2 (p3) has the architecture diagram for K3 (which is the same one on the Kimi K3 blog post https://www.kimi.com/blog/kimi-k3). AFAICT, that diagram along with section 2.3 should answer your question.
Note: I'm not familiar with LLM/NN architecture to answer it more precisely than that; I only have a surface level understanding from watching various YouTube channels like 3B1B and Welch Labs on the subject.