qwen3.5-latex-ocr-finetune

Qwen3.5-0.8B — Fine-tuned for LaTeX OCR

This model is a fine-tuned version of unsloth/Qwen3.5-0.8B, a vision-language model, adapted to convert images of handwritten/printed math formulas into LaTeX code.

Fine-tuning was performed using Unsloth with LoRA (parameter-efficient fine-tuning) on the unsloth/LaTeX_OCR dataset.

⚠️ A full-scale version trained on the complete 68.7k-row unsloth/LaTeX_OCR dataset is available at qwen3.5-latex-ocr-finetune-v2.

Model Details

• Base model: unsloth/Qwen3.5-0.8B (vision-language)
• Fine-tuning method: LoRA (r=16, alpha=16, all attention + MLP + vision layers)
• Framework: Unsloth + TRL (SFTTrainer)
• Dataset: unsloth/LaTeX_OCR — handwritten/printed math formula images paired with LaTeX transcriptions
• Task: Image → LaTeX transcription

Training Setup

Evaluation — Before vs. After Fine-tuning

Evaluated on a held-out split of 30 samples (not seen during training) from the same dataset, using Character Error Rate (CER), exact-match accuracy, and BLEU.

Usage

from transformers import AutoModelForImageTextToText, AutoProcessor
from PIL import Image
import torch

model_id = "bhaskar1707/qwen3.5-latex-ocr-finetune"

model = AutoModelForImageTextToText.from_pretrained(model_id, torch_dtype=torch.float16, trust_remote_code=True).to("cuda")
processor = AutoProcessor.from_pretrained(model_id, trust_remote_code=True)

image = Image.open("your_formula_image.png").convert("RGB")
instruction = "Write the LaTeX representation for this image."

messages = [{"role": "user", "content": [{"type": "image"}, {"type": "text", "text": instruction}]}]
input_text = processor.apply_chat_template(messages, add_generation_prompt=True)
inputs = processor(image, input_text, add_special_tokens=False, return_tensors="pt").to("cuda")

output_ids = model.generate(**inputs, max_new_tokens=128, temperature=1.5, min_p=0.1)
latex = processor.batch_decode(output_ids[:, inputs["input_ids"].shape[1]:], skip_special_tokens=True)[0]
print(latex)

Or with Unsloth (faster load/inference, requires a CUDA GPU):

from unsloth import FastVisionModel

model, tokenizer = FastVisionModel.from_pretrained("bhaskar1707/qwen3.5-latex-ocr-finetune", load_in_4bit=True)
FastVisionModel.for_inference(model)

Limitations

• Trained on a limited step budget for demonstration purposes; results may improve further with a full multi-epoch training run.
• Performance is best on formulas visually similar to the LaTeX_OCR dataset distribution; handwriting styles or symbols far outside this distribution may transcribe less accurately.
• As with any generative model, occasional hallucinated symbols or malformed LaTeX are possible, especially for long/complex expressions.

Citation / Acknowledgements

• Base model and fine-tuning framework: Unsloth AI
• Dataset: unsloth/LaTeX_OCR

Fine-tuned by Bhaskar Pal — GitHub · LinkedIn