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--- |
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license: gemma |
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metrics: |
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- perplexity |
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base_model: |
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- google/gemma-3-1b-it-qat-q4_0-gguf |
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--- |
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This is a requantized version of https://huggingface.co/google/gemma-3-1b-it-qat-q4_0-gguf. |
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The official QAT weights released by google use fp16 (instead of Q6_K) for the embeddings table, which makes this model take a significant extra amount of memory (and storage) compared to what Q4_0 quants are supposed to take. |
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~~Instead of quantizing the table myself, I extracted it from Bartowski's quantized models, because those were already calibrated with imatrix, which should squeeze some extra performance out of it.~~ |
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Requantizing with llama.cpp fixes that and gives better result than the other thing. |
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Here are some perplexity measurements: |
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| Model | File size ↓ | PPL (wiki.text.raw) ↓ | |
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| --- | --- | --- | |
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| [This model](https://huggingface.co/stduhpf/google-gemma-3-1b-it-qat-q4_0-gguf-small/blob/main/gemma-3-1b-it-q4_0_s.gguf) | 720 MB | 28.0468 +/- 0.26681 | |
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| [This model (older version)](https://huggingface.co/stduhpf/google-gemma-3-1b-it-qat-q4_0-gguf-small/blob/f325927302d106ad204c0b6a8f09f216a0447519/gemma-3-1b-it-q4_0_s.gguf) | 720 MB | 28.2603 +/- 0.26947 | |
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| [Q4_0 (bartowski)](https://huggingface.co/bartowski/google_gemma-3-1b-it-GGUF/blob/main/google_gemma-3-1b-it-Q4_0.gguf) | 722 MB | 34.4906 +/- 0.34539 | |
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| [QAT Q4_0 (google)](https://huggingface.co/google/gemma-3-1b-it-qat-q4_0-gguf/blob/main/gemma-3-1b-it-q4_0.gguf) | 1 GB | 28.0400 +/- 0.26669 | |
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| [BF16 (upscaled to f32 for faster inference)](https://huggingface.co/google/gemma-3-1b-it) | 2 GB | 29.1129 +/- 0.28170 | |
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Note that this model ends up smaller than the Q4_0 from Bartowski. This is because llama.cpp sets some tensors to Q4_1 when quantizing models to Q4_0 with imatrix, but this is a static quant. |
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I also fixed the control token metadata, which was slightly degrading the performance of the model in instruct mode. Shoutout to ngxson for [finding the issue](https://huggingface.co/google/gemma-3-12b-it-qat-q4_0-gguf/discussions/3#67f6a2e0207b4bceea793151), |
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tdh111 for [making me aware of the issue](https://huggingface.co/stduhpf/google-gemma-3-27b-it-qat-q4_0-gguf-small/discussions/3#67f74fdf8411d4d6a82049db), |
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and u/dampflokfreund on reddit ([Dampfinchen](https://huggingface.co/Dampfinchen) on Huggingface) for [sharing the steps to fix it](https://www.reddit.com/r/LocalLLaMA/comments/1jvi860/comment/mmcuvw2). |
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That model still struggles at long context with these fixes (just like the original qat model). |
