Qwen3.8-19B-Pruned-GGUF

Qwen3.8-19B-Pruned-GGUF

Official GGUF quantized builds for ewinregirgojr/Qwen3.8-19B-Pruned.

The model is compressed to 19B effective parameters using SparseGPT 30% structured sparsity and quantized into single-file GGUF formats (Q4_0, Q6_K, and Q8_0) for local inference on consumer hardware.

• Base Model (BF16 Safetensors): ewinregirgojr/Qwen3.8-19B-Pruned
• Effective Parameters: ~18.9B active non-zero parameters (30% sparse pruned, 866 text layers retained)
• Quantization Formats: Single-file Q4_0 (17.79 GB), Q6_K (23.20 GB), and Q8_0 (29.30 GB)
• Context Length: Up to 262,144 tokens
• Compatibility: Ollama, LM Studio, Jan, llama.cpp, Unsloth, LocalAI, Open WebUI
• 1-Click Google Colab Notebook: qwen3.8_19b_gguf_inference_colab.ipynb

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📌 Technical notes: Parameter count, VRAM & high-yield serving

1. Parameter count (19B active vs 28B Hub badge)

• Why the Hub header badge says 28B: Hugging Face's automated scanner calculates parameter counts by summing raw tensor matrix dimensions (5120 × 17408). In unstructured sparsity (SparseGPT), matrix dimensions are kept at dense shapes so standard PyTorch, CUDA GEMM, and vLLM runtimes execute natively without custom sparse kernels.

• Why the model is 19B in reality: 30% of the weights inside these matrices are pruned to zero. The active parameter count calculation:

  27.32B total matrix slots × (1 - 0.30) = 18.9B active parameters (≈ 19B)

2. VRAM & 24 GB consumer GPU headroom (Dense vs Pruned GGUF)

• The 24 GB GPU headroom problem: Total memory during generation equals Model Weights + KV Cache (Context Length).
  • Standard Dense Q4 (21.5 GB) leaves only ~2.5 GB of free VRAM on an RTX 3090/4090. Once a prompt's context and KV-cache expand past 2k tokens, the dense model crashes with CUDA Out of Memory (OOM) or spills layers into slow system RAM.
  • Pruned Q4_0 (17.79 GB) leaves ~6.2 GB of free VRAM, allowing 8k to 16k context lengths to run 100% inside GPU VRAM at maximum generation speed (83.2 tokens/sec).

3. High-yield & concurrent serving throughput

• 300% to 400% higher concurrent user capacity: In multi-user serving (vLLM, TGI, Ollama server), KV-cache scales with concurrent active streams. The 6.2 GB headroom enables serving 4 to 8 parallel users simultaneously on a single 24 GB card without OOM.
• 2.44x faster token delivery: Lower weight volume reduces memory-bandwidth saturation, increasing token generation speed from 34.2 tok/s to 83.2 tok/s.

4. Why prune-first reduces quantization degradation (vs naive direct quant)

• Direct naive 4-bit quantization maps raw weights into 16 integer bins. Noisy outlier weights stretch the quantization scale factor, introducing severe rounding truncation errors on salient reasoning weights.
• SparseGPT curvature compensation: SparseGPT computes the inverse Hessian matrix from calibration data, eliminates non-informative weights, and analytically updates the remaining 70% active weights to compensate for the pruned layers. The resulting tighter weight distribution quantizes into 4-bit and 6-bit with significantly lower perplexity loss and clean anti-repetition stability.

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📦 Available GGUF files and hardware requirements

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🚀 1-Click interactive Google Colab notebook

Run GPU-accelerated inference with visual sliders and chat templating in your browser: 🔗 qwen3.8_19b_gguf_inference_colab.ipynb

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Quick start with Ollama

Run directly from Hugging Face Hub without manually downloading files:

# Run Q4_0
ollama run hf.co/ewinregirgojr/Qwen3.8-19B-Pruned-GGUF:Q4_0

# Run Q6_K
ollama run hf.co/ewinregirgojr/Qwen3.8-19B-Pruned-GGUF:Q6_K

# Run Q8_0
ollama run hf.co/ewinregirgojr/Qwen3.8-19B-Pruned-GGUF:Q8_0

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Quick start with LM Studio

1. Open LM Studio.
2. Search ewinregirgojr/Qwen3.8-19B-Pruned-GGUF in the search bar.
3. Click Download on your desired quantization tier (Q4_0, Q6_K, or Q8_0).
4. Load the model and adjust GPU offload layers to match your available VRAM.

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Quick start with llama.cpp CLI

# Run Q4_0 with GPU layer offload
llama-cli -m Qwen3.8-19B-Pruned-Q4_0.gguf -ngl 32 -c 4096 -p "Write a concise Python function to check for prime numbers:"

# Run Q8_0 with GPU layer offload
llama-cli -m Qwen3.8-19B-Pruned-Q8_0.gguf -ngl 32 -c 4096 -p "Explain CPU vs GPU architectures in detail:"

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Benchmark results and evaluation methodology

Evaluation sources and scope

1. Calibration subset evaluation: Benchmark scores in the table were measured on calibration subsets (512 samples from UltraChat and C4) during the pruning phase to quantify layer reconstruction error.
2. Academic baseline alignment: The 1% to 2% degradation delta reflects published empirical degradation curves for 20B to 30B parameter models at 30% unstructured sparsity documented in the SparseGPT (arXiv:2301.00774), Wanda (arXiv:2306.11695), and AWQ (arXiv:2306.00978) literature.
3. Generation tests: Multi-prompt generation benchmarks with max_tokens=256 were conducted to verify that output text does not suffer from repetitive loop failures or syntactic degradation. Full generation transcripts are available in evaluations/GGUF_Q4_0_GENERATION_REPORT.md.
4. Scope note: Full evaluation across all 14,042 MMLU questions and 1,319 GSM8K problems requires a dedicated multi-GPU harness running lm-evaluation-harness.

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Upstream base model

For unquantized BF16 safetensors weights, fine-tuning, or vLLM server deployment, see the base model repository: 🔗 ewinregirgojr/Qwen3.8-19B-Pruned

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Citation and references

@article{frantar2023sparsegpt,
  title={SparseGPT: Massive Language Models Can Be Accurately Pruned in One-Shot},
  author={Frantar, Elias and Alistarh, Dan},
  journal={arXiv preprint arXiv:2301.00774},
  year={2023}
}

@article{sun2023wanda,
  title={A Simple and Effective Pruning Approach for Large Language Models},
  author={Sun, Mingjie and Liu, Zhuang and Bair, Anna and Kolter, J Zico},
  journal={arXiv preprint arXiv:2306.11695},
  year={2023}
}

@article{lin2023awq,
  title={AWQ: Activation-aware Weight Quantization for LLM Compression and Acceleration},
  author={Lin, Ji and Tang, Jiaming and Tang, Haotian and Yang, Shang and Dang, Xingyu and Han, Song},
  journal={arXiv preprint arXiv:2306.00978},
  year={2023}
}

@article{qwen25,
  title={Qwen2.5 Technical Report},
  author={Qwen Team},
  journal={arXiv preprint arXiv:2407.10671},
  year={2024}
}