3 ms·

What is the probability of that happening?

zamadatix 2y ago
DeepSeek V3/R1 uses 8 routed experts out of 256, so not all as often as one would like. That said, having even just a single GPU will greatly speed up prompt processing which is worth it even if the inference speed was the same. Ktransformers has a document about using CPU + a single 4090D to reach decent tokens/s but I'm not sure how much of the perf is due to the 4090D vs other optimizations/changes for the CPU side https://github.com/kvcache-ai/ktransformers/blob/main/doc/en/DeepseekR1_V3_tutorial.md https://github.com/kvcache-ai/ktransformers/blob/main/doc/en... The final step of going to 6 experts instead of 8 feels like cheating (not a lossless optimization).
- genewitch 2y ago
  where does 256 come from? it's repeated in here and elsewhere that a single expert is 37B sized, so you'd have to have way more than "several hundred billion parameters", to hold 256 of those? Maybe i don't understand the architecture, but if that's the case, then everyone repeating 37B doesn't, either.
  - zamadatix 2y ago
    I think this diagram from the DeepSeekMoE paper explains it the clearest: https://i.imgur.com/CRKttob.png https://i.imgur.com/CRKttob.png The one on the right is how the feed forward layers of DeepSeek V3/R1 work, blue and green are experts, and everything in that right section is what counts as "active parameters". K (K=8 for these models, but you can customize that if you want) experts of 256 per layer are activated at a time. The 256 comes from the model file, it's just how many they chose to build it with. In these models there is also 1 shared expert which is always active in the layer. The router picks which k routed experts to use each forward pass and then a gating mechanism combines the outputs. If you sum the 1 shared expert + K routed experts + router + output networks you end up with 37 B parameters active for each feed forward layer pass. The individual experts are therefore much smaller than the total (probably something like 4 B parameters each? I've never really checked that directly). Or, for the short answer: "37 B is the active parameters of 9 experts + 'overhead', not the parameters of a single expert".

DeepSeek V3/R1 uses 8 routed experts out of 256, so not all as often as one would like. That said, having even just a single GPU will greatly speed up prompt processing which is worth it even if the inference speed was the same. Ktransformers has a document about using CPU + a single 4090D to reach decent tokens/s but I'm not sure how much of the perf is due to the 4090D vs other optimizations/changes for the CPU side https://github.com/kvcache-ai/ktransformers/blob/main/doc/en/DeepseekR1_V3_tutorial.md https://github.com/kvcache-ai/ktransformers/blob/main/doc/en... The final step of going to 6 experts instead of 8 feels like cheating (not a lossless optimization).

genewitch 2y ago
where does 256 come from? it's repeated in here and elsewhere that a single expert is 37B sized, so you'd have to have way more than "several hundred billion parameters", to hold 256 of those? Maybe i don't understand the architecture, but if that's the case, then everyone repeating 37B doesn't, either.
- zamadatix 2y ago
  I think this diagram from the DeepSeekMoE paper explains it the clearest: https://i.imgur.com/CRKttob.png https://i.imgur.com/CRKttob.png The one on the right is how the feed forward layers of DeepSeek V3/R1 work, blue and green are experts, and everything in that right section is what counts as "active parameters". K (K=8 for these models, but you can customize that if you want) experts of 256 per layer are activated at a time. The 256 comes from the model file, it's just how many they chose to build it with. In these models there is also 1 shared expert which is always active in the layer. The router picks which k routed experts to use each forward pass and then a gating mechanism combines the outputs. If you sum the 1 shared expert + K routed experts + router + output networks you end up with 37 B parameters active for each feed forward layer pass. The individual experts are therefore much smaller than the total (probably something like 4 B parameters each? I've never really checked that directly). Or, for the short answer: "37 B is the active parameters of 9 experts + 'overhead', not the parameters of a single expert".