Gemma 4 Architecture Comparison
Flagship open-weight release days are always exciting. Was just reading through the Gemma 4 reports, configs, and code, and here are my takeaways: Architecture-wise, besides multi-model support, Gemma 4 (31B) looks pretty much unchanged compared to Gemma 3 (27B). Link to the comparison page: https://sebastianraschka.com/llm-architecture-gallery/?compare=gemma-3-27b 2Cgemma-4-31b Gemma 4 maintains a relatively unique Pre- and Post-norm setup and remains relatively classic, with a 5:1 hybrid attention mechanism combining a sliding-window (local) layer and a full-attention (global) layer. https://preview.redd.it/7bn493789zsg1.png?width=1444 format=png auto=webp s=4b28421ed276cb0b1ba133e3c325d446d68ea1ef The attention mechanism itself is also classic Grouped Query Attention (GQA). But let’s no
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