Comment by bachmeier
7 hours ago
> DiffusionGemma reverses this inefficiency. Instead of predicting words sequentially, it drafts an entire 256-token paragraph simultaneously. By giving the computer's processor a larger chunk of work at once, DiffusionGemma utilizes your hardware to its full potential. It upgrades your model inference from a single, sequential typewriter to a massive printing press that stamps the entire block of text simultaneously.
> Operating as a 26B total Mixture of Experts (MoE) model that activates only 3.8B parameters during inference, DiffusionGemma fits comfortably within 18GB VRAM limits of high-end dedicated consumer GPUs when quantized.
Okay, so Gemma 4 26B is a MoE model that's really fast on my 24 GB GPU using ollama. This sounds like speculative decoding but I don't think that works with MoE models? It's hard to keep up with all this when it's not your job to keep up with it.
This is a different model with, confusingly, approximately the same number of params as the existing gemma4 MoE. Unclear from a quick scan whether one was trained somehow from the other.
The mechanism isn't the same as speculative decoding. Speculative decoding happens sequentially and (usually) a couple of tokens at a time; diffusion doesn't, and does blocks of text at once. I haven't read the collateral yet but my assumption would be that it's trained to keep the specific experts stable across a diffusion block.
Thanks. I found this other comment that links to a very thorough explanation: https://news.ycombinator.com/item?id=48479042