qwen3-4b-structured-output-lora-tuned_param_v2-without_cot
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
- Base model: Qwen/Qwen3-4B-Instruct-2507
- Method: QLoRA (4-bit)
- Max sequence length: 512
- Epochs: 3
- Learning rate: 1e-06
- LoRA: r=64, alpha=128
- Task-weighted sampling: enabled (see below)
Data preprocessing / curation
The training data is derived from u-10bei/structured_data_with_cot_dataset_512_v2 with the following preprocessing:
- Keep only samples whose final message is a non-empty assistant turn.
- Identify the final assistant message and locate the last occurrence of one of the
output markers:
Output:, OUTPUT:, Final:, Answer:, Result:, Response:.
- If such a marker is found, the assistant content is trimmed so that only the
substring after the marker is retained as the training target.
- When the retained segment is enclosed in a Markdown-style code fence
(e.g.
json, yaml, xml, toml),
the outer code fence is removed, and only the raw structured content is kept.
- If no output marker is present, the original assistant content is preserved.
This preprocessing is applied uniformly to both generation and conversion tasks
and is performed only at training time.
No post-processing or output modification is applied during inference.
Usage
1from transformers import AutoModelForCausalLM, AutoTokenizer
2from peft import PeftModel
3import torch
4
5base = "Qwen/Qwen3-4B-Instruct-2507"
6adapter = "your_id/your-repo"
7
8tokenizer = AutoTokenizer.from_pretrained(base)
9model = AutoModelForCausalLM.from_pretrained(
10 base,
11 torch_dtype=torch.float16,
12 device_map="auto",
13)
14model = PeftModel.from_pretrained(model, adapter)
Sources & Terms (IMPORTANT)
Training data: u-10bei/structured_data_with_cot_dataset_512_v2
Dataset License: MIT License. This dataset is used and distributed under the terms of the MIT License.
Compliance: Users must comply with the MIT license (including copyright notice) and the base model's original terms of use.
