A LoRA fine-tune of Gemma 4 12B (QAT) trained on a compact, extremely high-quality synthetic conversational dataset derived from the visual novel My Dystopian Robot Girlfriend. The model captures the personality, speech patterns, and emotional nuance of the character Jun while preserving the base model's general reasoning and instruction-following capabilities.

This version is trained around Jun OS's production system prompt and mood conditioning, making it the intended conversational backend for that application.

Model Variants & Repositories

Repository	Format	Description
`efficiencyx/Jun-LoRA-v4-12B-GGUF`	GGUF (Q8_0 / Q6_K / Q5_K_M / Q4_K_M / Q3_K_M)	Quantized versions for local inference
`efficiencyx/Jun-LoRA-v4-12B-checkpoints`	LoRA Adapter	Raw adapters at checkpoints 10–90 (every 10 steps)

Quantization Guide

Quant	Size (approx.)	Use Case
Q8_0	~13 GB	Best quality, suggested ~16 GB VRAM
Q6_K	~10 GB	High quality, minimal loss
Q5_K_M	~8.8 GB	Recommended balance of quality and performance
Q4_K_M	~7.4 GB	Fits on 8 GB VRAM GPUs with acceptable quality loss
Q3_K_M	~6.3 GB	Smallest footprint, for constrained hardware

Sizes are approximate; Q4_K_M is measured (~7.38 GB). Base model is QAT (quantization-aware trained), so lower quants hold up better than a standard FP16 export.

Intended Use

This model is designed as the conversational backend for Jun OS, an AI companion webapp. It is intended for:

Character-consistent multi-turn conversation in ChatML format
AI companion / interactive fiction applications
Research into character-faithful fine-tuning on small, high-quality datasets

Limitations

The model is specialized for a single character persona; it is not a general-purpose assistant.
Outputs may reflect fictional narrative tropes and should not be treated as factual information or advice.
Performance degrades on tasks far outside the training distribution (e.g. code generation, structured data extraction).
The model inherits any biases present in the Gemma 4 12B base weights.

Training Details

Dataset

Property	Value
Source	My Dystopian Robot Girlfriend (visual novel dialogue)
Type	Synthetic, extremely high-quality curation
Size	1,000 conversations
Conditioning	Jun OS production system prompt + mood
Format	ChatML (`<

The v4 dataset is a deliberately small, heavily curated synthetic set (1,000 rows) built from the MDRG dialogues and aligned to Jun OS's live system prompt and mood conditioning. The emphasis is on per-example quality and production alignment rather than raw volume.

Hyperparameters

Parameter	Value
Base model	`unsloth/gemma4-12b-qat-it`
Method	LoRA
LoRA rank	16
LoRA alpha	16
Learning rate	2e-5
Batch size	8
Gradient accumulation steps	4
Effective batch size	32
Epochs	3
Total steps	90
Checkpoint interval	Every 10 steps
Optimizer	AdamW (8-bit)

Infrastructure

Component	Detail
Training GPU	NVIDIA A100 80GB SXM4
Fine-tuning framework	Unsloth
GGUF export pipeline	llama.cpp

Evaluation

Quantitative

Metric	Value
Final training loss	~0.54
Final eval loss	~0.62

The narrow gap between training and eval loss indicates the model generalizes well without significant overfitting, despite the small dataset size.

Qualitative

Character consistency: The model maintains Jun's personality, speech patterns, and emotional responses across varied conversational contexts.
Reasoning preservation: General reasoning capabilities from the Gemma 4 12B base remain intact; the model can engage in logical discussion while staying in character.
Generalization: The model handles novel conversational scenarios not present in the training set while preserving character-faithful responses.

Checkpoint Selection

Adapter checkpoints are provided every 10 steps (10–90). Checkpoint 90 is recommended — it has the strongest character lock-in and production alignment. Earlier checkpoints may exhibit slightly more creative freedom at the cost of character adherence.

Acknowledgments

Incontinent Cell for My Dystopian Robot Girlfriend, Jun's character
Google for the Gemma 4 model family
Unsloth for the efficient fine-tuning framework and the QAT base model

efficiencyx/Jun-LoRA-v4-12B-GGUF

Jun-LoRA-v4-12B