Trials and tribulations fine-tuning & deploying Gemma-4 [P]
Reddit - Machine Learning
1 min read
About this article
Hey all, Our ML team spent some time this week getting training and deployments working for Gemma-4, and wanted to document all the things we ran into along the way. PEFT doesn't recognize Gemma 4's custom layers. Google wrapped vision/audio projections in a new ClippableLinear class that doesn't inherit from nn.Linear, so PEFT refuses to attach LoRA, even for text-only fine-tuning. Fix: unwrap the wrappers after loading weights but before calling PEFT. SFTTrainer killed training silently. TR...
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Originally published on April 18, 2026.
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