Gemma-4-Abliterated-GPTQ-4bit-Pro-v1

Overview

Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 is a GPTQ-quantized checkpoint intended for efficient GPU inference, published by groxaxo. It is intended for open-source evaluation, reproducible experimentation, and compatible local or hosted inference workflows. The wording below is deliberately limited to what can be verified from this repository's metadata and artifacts.

The repository name identifies a behavior-modified or reduced-filtering lineage. That label describes the source or conversion history; it is not a guarantee of unrestricted behavior in every prompt or runtime. Test outputs carefully before sharing or deploying them.

At a glance

Field	Details
Format	GPTQ
Source / base	wangzhang/gemma-4-31B-it-abliterated
Intended task	image-text-to-text
License	other

What is included

• *.safetensors (5 files)
• config.json
• generation_config.json
• tokenizer.json
• tokenizer_config.json
• chat_template.jinja
• quantize_config.json
• Additional configuration, tokenizer, processor, or shard files (13 visible artifacts total)

Quick start

vLLM (documented configuration)

CUDA_VISIBLE_DEVICES=0,1 \
vllm serve groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 \
  --tensor-parallel-size 2 \
  --gpu-memory-utilization 0.92 \
  --max-model-len 8192 \
  --max-num-batched-tokens 32768 \
  --trust-remote-code

This command is taken from the repository documentation. Adjust tensor parallelism, context length, and cache settings to match your hardware and vLLM version.

Compatibility and responsible use

• Use a runtime that explicitly supports this format, architecture, and modality.
• Keep configuration, tokenizer, processor, projection, and weight files from the same revision together.
• Review the source model card and license before redistribution or deployment.
• Hardware needs depend on parameter count, context length, cache precision, quantization, and concurrency.
• Report reproducible issues with the runtime version, hardware, launch command, and a minimal example.

Quantization or conversion changes numerical behavior, memory use, and throughput relative to the source checkpoint; validate quality on your own workload.

Generated outputs may be inaccurate or unsuitable for a given use case. Users are responsible for testing behavior, applying appropriate safeguards, and complying with applicable licenses and laws.

Gemma-4-Abliterated-GPTQ-4bit-Pro-v1

Big-model capability. 4-bit footprint. Built for local inference that does not melt your rig.

Base Model • GPTQ Pro • groxaxo

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Overview

Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 is a deployment-ready 4-bit GPTQ Pro quantization of wangzhang/gemma-4-31B-it-abliterated, built by groxaxo for efficient local inference, reduced VRAM usage, and practical 2-GPU serving.

This release targets users who want the behavior and capability of a 31B-class Gemma 4 model without the painful memory requirements of full-precision weights.

Quantized with GPTQ Pro by groxaxo.

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Why This Quant?

Most large models are annoying to deploy locally: too much VRAM, slow loading, awkward sharding, and poor usability on real-world hardware.

This release focuses on what actually matters:

• Lower VRAM pressure — 4-bit quantization makes a 31B-class model much easier to run locally.
• Consumer GPU friendly — designed for practical inference on local GPU rigs, especially 2x GPU setups.
• Deployment-first packaging — safetensors format, clean naming, and inference-oriented quantization.
• Strong quality-to-size ratio — keeps the model useful while heavily reducing the weight footprint.
• Better serving headroom — more VRAM remains available for KV cache, batching, and longer contexts.
• Abliterated behavior profile — based on the abliterated Gemma 4 31B IT variant.
• Built by groxaxo — quantized using the GPTQ Pro pipeline for practical local deployment.

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Model Details

Field	Value
Base model	wangzhang/gemma-4-31B-it-abliterated
Quantization	GPTQ Pro
Precision	4-bit
Format	Safetensors
Model size	~19.2 GB
Quantized by	groxaxo
GPTQ Pro repo	groxaxo/GPTQ-Pro
Intended use	Inference / serving

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Key Benefits

Efficient Local Serving

Run a 31B-class model with a dramatically reduced memory footprint. This makes the model more practical for local labs, private inference servers, hobbyist clusters, and dual-GPU consumer setups.

Better Hardware Utilization

Because the weights are compressed to 4-bit, more VRAM remains available for the parts that matter during inference: KV cache, batching, longer contexts, and higher request concurrency.

Practical 2-GPU Deployment

This model is suitable for tensor-parallel serving across 2 GPUs. Homogeneous GPUs are strongly preferred for maximum stability and throughput.

Smaller Download, Faster Iteration

At roughly 19.2 GB, this release is easier to download, store, move, test, and redeploy than full-precision checkpoints.

Built for Builders

This quant is intended for people actually deploying models:

• Local assistants
• Private LLM APIs
• vLLM serving
• 2-GPU inference
• Offline/private generation
• Benchmarking
• Rapid model comparison
• Text and code generation experiments

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Deployment

Install vLLM

pip install -U vllm

Recommended vLLM Serving Command

For a 2x GPU setup:

CUDA_VISIBLE_DEVICES=0,1 \
vllm serve groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 \
  --tensor-parallel-size 2 \
  --gpu-memory-utilization 0.92 \
  --max-model-len 8192 \
  --trust-remote-code

For 2x RTX 3090, this is the clean setup. Keep the tensor-parallel group homogeneous; mixing a 3090 with a weaker card is only worth it when memory matters more than throughput.

Conservative 2-GPU Command

Use this if you hit OOM or want more KV-cache safety:

CUDA_VISIBLE_DEVICES=0,1 \
vllm serve groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 \
  --tensor-parallel-size 2 \
  --gpu-memory-utilization 0.85 \
  --max-model-len 8192 \
  --trust-remote-code

Higher Throughput 2-GPU Command

Use this for API-style serving with batching:

CUDA_VISIBLE_DEVICES=0,1 \
vllm serve groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 \
  --tensor-parallel-size 2 \
  --gpu-memory-utilization 0.92 \
  --max-model-len 8192 \
  --max-num-batched-tokens 32768 \
  --trust-remote-code

Useful knobs:

• Lower --max-model-len if you do not need long context.
• Increase --gpu-memory-utilization only if the server is stable.
• Use two matching GPUs whenever possible.
• Avoid mixing 3090 + 3060 unless memory is the priority over speed.
• If throughput tanks, the weaker GPU is probably dragging the tensor-parallel group down.

---

Transformers / AutoGPTQ

pip install -U transformers accelerate auto-gptq

from transformers import AutoTokenizer
from auto_gptq import AutoGPTQForCausalLM

model_id = "groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1"

tokenizer = AutoTokenizer.from_pretrained(
    model_id,
    use_fast=True,
    trust_remote_code=True,
)

model = AutoGPTQForCausalLM.from_quantized(
    model_id,
    device="cuda:0",
    use_safetensors=True,
    trust_remote_code=True,
)

prompt = "Explain tensor parallelism in one paragraph."
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)

outputs = model.generate(
    **inputs,
    max_new_tokens=256,
    temperature=0.7,
    top_p=0.9,
)

print(tokenizer.decode(outputs[0], skip_special_tokens=True))

---

Throughput Tuning

For better serving performance:

CUDA_VISIBLE_DEVICES=0,1 \
vllm serve groxaxo/Gemma-4-Abliterated-GPTQ-4bit-Pro-v1 \
  --tensor-parallel-size 2 \
  --gpu-memory-utilization 0.92 \
  --max-model-len 8192 \
  --max-num-batched-tokens 32768 \
  --trust-remote-code

Recommended tuning:

• Lower --max-model-len for better throughput if long context is unnecessary.
• Increase --max-num-batched-tokens for heavier concurrent workloads.
• Keep tensor-parallel GPUs homogeneous.
• Prefer 2x RTX 3090 or equivalent over mixed VRAM/bandwidth setups.
• Watch VRAM during long prompts; KV cache grows fast.
• Do not overbatch until latency becomes trash. Throughput without usable latency is just benchmark cosplay.

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Recommended Use Cases

• Local chat inference
• Private LLM serving
• vLLM deployment
• 2-GPU inference
• Research and experimentation
• Instruction-following workloads
• Text generation
• Code generation
• Offline/private assistant workflows

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Limitations

This is a 4-bit quantized model. Some degradation compared to the original higher-precision checkpoint is expected, especially on:

• highly sensitive reasoning tasks
• exact numeric work
• long-context edge cases
• strict instruction-following edge cases
• tasks requiring high precision in small probability differences

This model is intended for inference only. It is not suitable for training or fine-tuning.

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Credits

• Base model: wangzhang/gemma-4-31B-it-abliterated
• Quantization: groxaxo
• Quantization pipeline: GPTQ Pro

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Quantized for people who actually run models, not just collect checkpoints.