qwen3-4b-structured-output-lora-202602080937

qwen3-4b-structured-output-lora-202602080937

This repository provides a LoRA adapter fine-tuned from Qwen/Qwen3-4B-Instruct-2507 using QLoRA (4-bit, Unsloth) to improve structured output accuracy (JSON / YAML / XML / TOML / CSV).

This repository contains LoRA adapter weights only.
Load the base model separately, then apply this adapter.

Training Objective

Improve strict, machine-readable structured outputs (no extra prose).

Data Normalization

To reduce preface/explanation text learned from the synthetic dataset, the training samples were normalized:

• Extracted only the substring after Output: in the final assistant message.
• Removed Markdown code fences (json/yaml/xml/toml/```csv).
• Dropped trailing "Notes:" sections if present.

Training Configuration

• Base model: Qwen/Qwen3-4B-Instruct-2507
• Method: QLoRA (4-bit), Unsloth
• Max sequence length: 512
• Epochs: 1
• Learning rate: 1e-06
• LoRA: r=64, alpha=128

Usage

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

base = "Qwen/Qwen3-4B-Instruct-2507"
adapter = "ryo-llm/qwen3-4b-structured-output-lora-202602080937"

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: u-10bei/structured_data_with_cot_dataset_512_v5

Dataset License: MIT License (see the dataset card).
Compliance: Users must comply with the dataset license terms and the base model's original terms of use.