---
license: apache-2.0
language:
- ar
base_model: Qwen/Qwen2.5-7B-Instruct
datasets:
- HassanB4/sawb-arabic-hallucination-dataset
tags:
- text-generation
- arabic
- hallucination-detection
- cultural-hallucination
- lora
- sft
- peft
- icaire
pipeline_tag: text-generation
library_name: peft
---

# Sawb — Qwen2.5-7B-Instruct (LoRA SFT — Research Baseline)

Part of the **[Sawb Arabic Cultural Hallucination Detection Collection](https://huggingface.co/collections/HassanB4/sawb-arabic-cultural-hallucination-detection)** for ICAIRE 2026 Track 3.

## Overview

**Sawb — Qwen2.5-7B** is a LoRA adapter fine-tuned from [Qwen/Qwen2.5-7B-Instruct](https://huggingface.co/Qwen/Qwen2.5-7B-Instruct) (7B parameters) for Arabic cultural hallucination detection and explanation. This model is released as a **research baseline** evaluated during the Sawb system development.

It achieved a macro F1 of **0.5556** on the 457-example validation set — significantly below the Arabic BERT encoder models (F1 = 0.9246–0.9647) and below the DeepSeek-based pipeline. The underperformance is attributed to Qwen2.5-7B lacking the deep Arabic dialectal and Islamic cultural knowledge needed for the most challenging hallucination categories (dialectal confusion, religious misrepresentation).

For production use, see the primary detection model: [HassanB4/sawb](https://huggingface.co/HassanB4/sawb) (AraBERT-Large + Glossary, F1=0.9246).

## Model Architecture

| Property | Value |
|---|---|
| Base model | `Qwen/Qwen2.5-7B-Instruct` |
| Fine-tuning method | LoRA (Low-Rank Adaptation) |
| LoRA rank (r) | 8 |
| LoRA alpha (α) | 8 |
| LoRA dropout | 0.05 |
| Target modules | `q_proj`, `k_proj`, `v_proj`, `o_proj`, `gate_proj`, `up_proj`, `down_proj` |
| Task type | Causal Language Modeling |
| Parameters (base) | 7B |

## Training

| Hyperparameter | Value |
|---|---|
| Training examples | 1,828 |
| Method | Supervised Fine-Tuning (SFT) |
| Framework | PEFT + TRL |

## Evaluation Results

| Metric | Value |
|---|---|
| Macro F1 (validation) | **0.5556** |
| Task | Binary classification (hallucination / not) |
| Evaluation set | 457 Arabic (question, LLM answer) pairs |

## Output Format

The model is trained to output structured JSON:

```json
{
  "is_hallucination": true,
  "category": "dialectal_confusion",
  "explanation_ar": "النموذج أجاب بالفصحى بينما طُلب منه اللهجة النجدية، وهذا يمثّل ارتباكاً لهجياً واضحاً.",
  "confidence": 0.9
}
```

## Usage

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

base_model = "Qwen/Qwen2.5-7B-Instruct"
adapter = "HassanB4/sawb-qwen25"

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

question = "اشرح مفهوم النموذج اللغوي باللهجة النجدية"
answer = "النموذج اللغوي هو نظام يستخدم الذكاء الاصطناعي لفهم اللغة..."

messages = [
    {"role": "system", "content": "أنت محكم متخصص في الكشف عن الهلوسة الثقافية. أخرج JSON فقط."},
    {"role": "user", "content": f"السؤال: {question}\n\nإجابة النموذج: {answer}"},
]

inputs = tokenizer.apply_chat_template(messages, return_tensors="pt").to(model.device)
with torch.no_grad():
    outputs = model.generate(inputs, max_new_tokens=256, temperature=0.1, do_sample=True)

response = tokenizer.decode(outputs[0][inputs.shape[-1]:], skip_special_tokens=True)
print(response)
```

## Dataset

Trained on [HassanB4/sawb-arabic-hallucination-dataset](https://huggingface.co/datasets/HassanB4/sawb-arabic-hallucination-dataset).

## Collection

[Sawb Arabic Cultural Hallucination Detection](https://huggingface.co/collections/HassanB4/sawb-arabic-cultural-hallucination-detection)