Comment by vlovich123

No, that’s a common misconception. MoE despite the name doesn’t have an “expert” slice that’s an expert in any particular thing. It’s just trained models such that a subset of all memory weights is active on a single token. Often, the weights active on the next token are different. It’s used to improve memory bandwidth (throughput) and also to even out load in a distributed serving model - one GPU hosts one “expert” and the conversation is routed to it for the next token. This requires a lot of movement of the KV cache of course so it’s difficult to retain speed across multi node splits - usually it’s a rack of GPUs that you do this for.