README.md

---
base_model: Qwen/Qwen3-4B-Instruct-2507
datasets:
- daichira/structured-5k-mix-sft
language:
- en
- ja
license: apache-2.0
library_name: peft
pipeline_tag: text-generation
tags:
- qlora
- lora
- structured-output
- structeval
---

# Qwen3-4B StructEval exp007 - structured-5k-mix-sft

This repository provides a **LoRA adapter** fine-tuned from
**Qwen/Qwen3-4B-Instruct-2507** using **QLoRA (4-bit, Unsloth)**.

**This repository contains LoRA adapter weights only**.
The base model must be loaded separately.

## Training Objective

This adapter is trained to improve **structured output accuracy**
(JSON / YAML / XML / TOML / CSV).

Loss is applied only to the final assistant output,
while intermediate reasoning (Chain-of-Thought) is masked.

## Training Configuration

- **Experiment ID**: exp007
- **Base model**: Qwen/Qwen3-4B-Instruct-2507
- **Training dataset**: daichira/structured-5k-mix-sft
- **Method**: QLoRA (4-bit)
- **Max sequence length**: 512
- **Epochs**: 1
- **Learning rate**: 2e-05
- **LoRA parameters**: r=64, alpha=128

## Usage

```python
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel
import torch

base = "Qwen/Qwen3-4B-Instruct-2507"
adapter = "junfukuda/qwen3-structeval-exp007-5kmix"

tokenizer = AutoTokenizer.from_pretrained(base)
model = AutoModelForCausalLM.from_pretrained(
    base,
    torch_dtype=torch.float16,
    device_map="auto",
)
model = PeftModel.from_pretrained(model, adapter)
```

## Sources & Terms (IMPORTANT)

**Training data**: daichira/structured-5k-mix-sft

**Dataset License**: The dataset used for training is subject to its original license terms.
Please refer to the dataset repository for specific license information.

**Compliance**: Users must comply with both the dataset's license terms and the base model's original terms of use.

## Competition Context

This model was developed as part of the StructEval competition, focusing on accurate structured output generation.