🤖 Huihui4-8B-A4B Model Card

📌 Overview

Huihui4-8B-A4B is a lightweight MoE (Mixture of Experts) conversational model optimized from Google's gemma-4-26B-A4B-it architecture. Through expert pruning and supervised fine-tuning on high-quality dialogue data, this model significantly reduces computational overhead while preserving core reasoning and interaction capabilities. It is specifically designed for deployment on consumer-grade hardware and code-related conversational tasks.

This model is not an ablation variant.

ollama

Please use the latest version of ollama

You can use huihui_ai/huihui-4:8b directly,

ollama run huihui_ai/huihui-4:8b

🧱 Architecture & Configuration

Parameter	Description
Base Model	google/gemma-4-26B-A4B-it
Total MoE Experts	32 (pruned from the original 128)
Active Experts per Token	8 (maintaining the A4B activation scale)
Model Positioning	Lightweight MoE conversational base / Consumer-hardware friendly

📊 Training Data & Methodology

• Data Source: 500+ high-quality dialogue samples carefully extracted from code preference data.
• Training Method: Supervised Fine-Tuning (SFT).
• Optimization Goal: Maintain semantic coherence, instruction-following capability, and code context understanding post-pruning.

📈 Evaluation & Performance

• Evaluation Tool: Quantitative perplexity assessment using the calculate_perplexity script.
• Test Results: Preliminary dialogue tests indicate smooth interactions and stable logic. The model performs reliably in daily conversations and code-assistance tasks, with no significant performance degradation observed after pruning.

💻 Inference & Deployment Recommendations

• Recommended Frameworks: vLLM / llama.cpp / HuggingFace Transformers
• VRAM Requirements:
  • FP16: < 18GB
  • INT4/INT8 Quantized: < 6~9GB (compatible with mainstream single consumer GPUs)
• Use Cases: Code conversation assistants, lightweight task planning, local deployment prototyping, and baseline validation for MoE pruning/merging techniques.

🗺️ Roadmap

1. Multi-Domain Fine-Tuning: Further SFT on four distinct datasets to enhance the generalization capabilities of this 32-expert model.
2. Expert Merging Validation: Experiment with merging the four independently fine-tuned models back into a 128-expert architecture, validating the feasibility of a "prune → fine-tune → merge" pipeline.
3. Core Objective: Ultimately verify the engineering viability of training and iterating on large-scale MoE models using only consumer-grade hardware.
4. If you're interested, feel free to fine-tune this model on your own datasets. We plan to merge all resulting models into a unified version at the end.

📝 Notes

• This model represents the initial pruned and fine-tuned iteration of the Huihui series. Future updates will involve multi-dataset integration and expert merging.
• calculate_perplexity evaluation script).
• Evaluation results

python evaluate_perplexity_final.py --model_path ./google/gemma-4-26B-A4B-it

Model Path     : ./google/gemma-4-26B-A4B-it
Eval Samples   : 100
Max Length     : 8192

model	Fine-tuning steps	num_experts	Perplexity	Average Loss
gemma-4-26B-A4B-it	0	128	1.5964 (+ 0 )	0.4678 (+ 0 )
gemma-4-26B-A4B-it-Pruned-32	0	32	2.4826 (+ 0.8862)	0.9093 (+ 0.4415)
gemma-4-26B-A4B-it-Pruned-32-sft-750	750	32	1.3827 (- 0.2137)	0.3240 (- 0.1438)
gemma-4-26B-A4B-it-Pruned-32-sft-1350	1350	32	1.2374 (- 0.359 )	0.2130 (- 0.2548)
gemma-4-26B-A4B-it-Pruned-32-sft-1800	1800	32	1.1724 (- 0.424 )	0.1590 (- 0.3088)
gemma-4-26B-A4B-it-Pruned-32-sft-2950	2950	32	1.0924 (- 0.504 )	0.0883 (- 0.3795)
gemma-4-26B-A4B-it-Pruned-32-sft-3550	2950	32	1.0645 (- 0.5319)	0.0625 (- 0.4053)
gemma-4-26B-A4B-it-Pruned-32-sft-4150	4150	32	1.0532 (- 0.5432)	0.0518 (- 0.416 )
gemma-4-26B-A4B-it-Pruned-32-sft-4700	4700	32	1.0411 (- 0.5553)	0.0403 (- 0.4275)
gemma-4-26B-A4B-it-Pruned-32-sft-7800	7800	32	1.0088 (- 0.5876)	0.0088 (- 0.459 )
gemma-4-26B-A4B-it-Pruned-32-sft-10900	10900	32	1.0035 (- 0.5929)	0.0035 (- 0.4643)

Citation

@misc{huihui4-8b-a4b,
      title  = {{Huihui4-8B-A4B}: A lightweight MoE (Mixture of Experts) conversational model},
      author = {Huihui-ai},
      year   = {2026},
      url    = {https://hf.co/huihui-ai/Huihui4-8B-A4B}
}

Contact

If you have any questions, please raise an issue or contact us at support@huihui.ai.