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docs: upstream-first KV-cache guidance (q8_0/q4_0, mainline Hadamard rotation); fork demoted to experimental

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@@ -12,6 +12,23 @@ datasets: [nvidia/Nemotron-Image-Training-v3]
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  inference: false
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  ---
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  # Nemotron-3-Nano-Omni-30B-A3B-Reasoning - TurboQuant MLX 3-bit
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  MLX 3-bit quantization of the **text tower** of `Nemotron-3-Nano-Omni-30B-A3B-Reasoning` (`nvidia/Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16`)
 
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  inference: false
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  ---
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+ > [!TIP]
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+ > **KV-cache quantization without any fork (recommended, 2026):** upstream
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+ > llama.cpp/Ollama now cover this natively — use `-ctk q8_0 -ctv q8_0`
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+ > (~half KV memory, negligible quality loss: perplexity +0.002–0.05) or
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+ > `-ctk q4_0 -ctv q4_0` (~quarter memory, ≈7.6% perplexity increase). In
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+ > Ollama: `OLLAMA_KV_CACHE_TYPE=q8_0` with `OLLAMA_FLASH_ATTENTION=1`. Keep
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+ > K and V types symmetric to stay on the fast fused Flash-Attention path.
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+ > Since April 2026, mainline llama.cpp also applies Hadamard rotation to
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+ > KV activations ([PR #21038](https://github.com/ggml-org/llama.cpp/pull/21038)),
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+ > which greatly improves low-bit KV quality (opt-out:
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+ > `LLAMA_ATTN_ROT_DISABLE=1`).
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+ >
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+ > The RotorQuant/TurboQuant fork flow below is **experimental/legacy**: the
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+ > TurboQuant llama.cpp PR was closed without merging (June 2026) and the fork
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+ > is unmaintained relative to mainline. It is NOT required to use this model.
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+ <!-- kv-upstream-note -->
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+
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  # Nemotron-3-Nano-Omni-30B-A3B-Reasoning - TurboQuant MLX 3-bit
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  MLX 3-bit quantization of the **text tower** of `Nemotron-3-Nano-Omni-30B-A3B-Reasoning` (`nvidia/Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16`)