SciGram-OV-7B

SciGram-OV-7B is a 7B-class vision-language model specialized in understanding scientific diagrams. It is based on LLaVA OneVision 7B and fine-tuned on SciGram, a large-scale dataset of scientific diagrams and synthetic visual instructions covering life, earth, and physical sciences.

The model is designed for multimodal understanding tasks involving scientific diagrams, including diagram question answering, visual grounding, diagram description, and science-related visual reasoning.

SciGram-OV-7B corresponds to the LLaVA-SciGram OneVision 7B model described in:

Raul Ortega and José Manuel Gómez-Pérez. From Terminology to Diagrams: Visual-Instruction Generation for Scientific Diagram Understanding. Proceedings of the Conference on Language Modeling (COLM 2026).

Model Details

Model Description

SciGram-OV-7B is a vision-language model fine-tuned to improve scientific diagram understanding. The model builds upon a pretrained LLaVA OneVision 7B model and is further trained using three SciGram training stages: SciGram-Align, SciGram-VIT, and SciGram-M³.

The training data contains scientific diagrams paired with synthetic captions and multiple-choice visual instructions covering life sciences, earth sciences, and physical sciences.

The model is intended primarily for research on scientific diagram understanding and multimodal scientific question answering.

• Developed by: Expert.ai Language Technology Research Laboratory
• Authors: Raul Ortega and José Manuel Gómez-Pérez
• Shared by: Expert.ai Language Technology Research Laboratory
• Model type: Vision-language model (VLM), based on LLaVA OneVision 7B
• Language(s): English
• License: CC BY 4.0
• Finetuned from: LLaVA OneVision 7B
• Vision encoder: google/siglip-so400m-patch14-384
• Language model: Qwen2-Instruct 7B
• Model format: Safetensors, FP16
• Maximum context length: 32,768 tokens

The released checkpoint contains approximately 8B parameters and is approximately 16.1 GB in size.

Model Sources

 

• Repository: https://github.com/expertailab/scigram
• Dataset: https://huggingface.co/datasets/expertailab/scigram_dataset
• Paper: https://openreview.net/pdf?id=Xdi2q5XKgB

How to Get Started with the Model

The model is released using the LLaVA-Qwen architecture. It can be loaded using a compatible LLaVA implementation and the Hugging Face checkpoint.

A typical workflow is:

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

model_id = "expertailab/scigram-7b"

processor = AutoProcessor.from_pretrained(model_id)
model = AutoModel.from_pretrained(
    model_id,
    torch_dtype=torch.float16,
    device_map="auto",
)

image = Image.open("scientific_diagram.png").convert("RGB")

prompt = "What does this scientific diagram show? Explain the main components and their relationships."

inputs = processor(
    images=image,
    text=prompt,
    return_tensors="pt"
).to(model.device)

with torch.no_grad():
    output = model.generate(
        **inputs,
        max_new_tokens=512,
    )

answer = processor.batch_decode(
    output,
    skip_special_tokens=True
)[0]

print(answer)

The model repository contains a LlavaProcessor configuration and uses the Qwen2 tokenizer with the special <image> token. For reproducible benchmark evaluation, users should follow the prompts and evaluation procedure described in the paper rather than relying on the generation defaults.

Training Details

Training Data

SciGram-OV-7B was fine-tuned using the three SciGram subsets:

1. SciGram-Align: 582,213 image-caption instruction pairs used for visual-language alignment.
2. SciGram-VIT: 737,887 diagram-based multiple-choice instruction examples.
3. SciGram-M³: 47,506 examples curated from TQA, ScienceQA, OpenBookQA, and ARC-Easy/Challenge.

Together, these subsets contain approximately 1.37 million training instructions.

The complete SciGram dataset contains 194,071 scientific diagrams and more than 1.4 million synthetic visual instructions. The diagrams cover life sciences, earth sciences, and physical sciences.

The dataset construction pipeline extracts scientific terminology from middle-school science curricula, generates atomic scientific facts, retrieves candidate diagrams from the web, filters and deduplicates the retrieved images, and generates captions and multiple-choice questions using a vision-language model.

The instruction-generation process used Qwen2-VL-7B to generate captions and diagram-grounded multiple-choice questions.

Training Procedure

SciGram-OV-7B was obtained by fine-tuning pretrained LLaVA OneVision 7B weights.

The training pipeline consists of three stages:

1. Alignment: The multimodal projection/alignment components are trained using SciGram-Align while the relevant pretrained components are kept frozen.
2. Visual Instruction Tuning: LoRA fine-tuning is performed on SciGram-VIT.
3. Further Fine-tuning: The resulting model is further fine-tuned with LoRA on SciGram-M³.

The model was trained on two NVIDIA A100 GPUs for approximately 450 GPU-hours.

Preprocessing

Images use the LLaVA OneVision anyres image processing strategy.

The model uses the following image grid pinpoints:

(384, 768)
(768, 384)
(768, 768)
(1152, 384)
(384, 1152)

The vision tower is:

google/siglip-so400m-patch14-384

The multimodal projector uses an MLP with two GELU layers (mlp2x_gelu), and the selected vision feature layer is -2.

Training Hyperparameters

Alignment stage — SciGram-Align

• Epochs: 1
• Batch size: 4
• Gradient accumulation steps: 4
• Learning rate: 1e-3
• Weight decay: 0
• Warmup ratio: 0.03
• Scheduler: cosine
• Maximum sequence length: 32,768
• Attention implementation: SDPA
• Multimodal projector learning rate: 2e-5

Visual Instruction Tuning — SciGram-VIT

• Epochs: 1
• LoRA rank: 128
• LoRA alpha: 256
• Batch size: 1
• Gradient accumulation steps: 16
• Learning rate: 1e-5
• Weight decay: 0
• Warmup ratio: 0.03
• Scheduler: cosine
• Maximum sequence length: 32,768
• Attention implementation: SDPA
• Multimodal projector learning rate: 2e-5

Further Fine-tuning — SciGram-M³

• Epochs: 3
• LoRA rank: 128
• LoRA alpha: 256
• Batch size: 1
• Gradient accumulation steps: 16
• Learning rate: 1e-5
• Weight decay: 0
• Warmup ratio: 0.03
• Scheduler: cosine
• Maximum sequence length: 32,768
• Attention implementation: SDPA
• Multimodal projector learning rate: 2e-5

Speeds, Sizes, Times

• Training hardware: 2 × NVIDIA A100 GPUs
• Training compute: approximately 450 GPU-hours
• Released checkpoint size: approximately 16.1 GB
• Parameter count: approximately 8B
• Model precision: FP16
• Maximum sequence length: 32,768 tokens

Evaluation

Testing Data, Factors & Metrics

Testing Data

SciGram-OV-7B was evaluated on three scientific multimodal question-answering benchmarks:

• TQA (Textbook Question Answering): includes text-only, true/false, and diagram-grounded questions across physical, life, and earth sciences.
• ScienceQA (SQA): contains multimodal science questions covering elementary and high-school science curricula.
• AI2D: contains grade-school science diagrams paired with multiple-choice questions, including evaluations with opaque and transparent diagram labels.

Metrics

The primary evaluation metric is accuracy (%), computed as the proportion of correctly answered multiple-choice questions.

Results

The reported results for LLaVA-SciGram OneVision 7B are:

Benchmark	Subset	Accuracy
TQA	Text MC	90.94
TQA	True/False	92.43
TQA	Diagram MC	80.12
TQA	Overall	85.57
ScienceQA	Natural Sciences	97.34
ScienceQA	Social Sciences	99.10
ScienceQA	Language	90.91
ScienceQA	Text	99.11
ScienceQA	Visual/Image Support	97.62
ScienceQA	No Support	92.13
ScienceQA	Grade 1–6	96.15
ScienceQA	Grade 7–12	95.85
ScienceQA	Overall	96.04
AI2D	Opaque Labels	83.45
AI2D	Transparent Labels	92.42
AI2D	Overall	87.94

Technical Specifications

Model Architecture and Objective

SciGram-OV-7B uses the LLaVA-Qwen multimodal architecture.

The released configuration specifies:

• Architecture: LlavaQwenForCausalLM
• Language backbone: Qwen/Qwen2-7B-Instruct
• Vision encoder: google/siglip-so400m-patch14-384
• Multimodal projector: 2-layer MLP with GELU activation
• Image processing: Any-resolution (anyres)
• Maximum sequence length: 32,768
• Data type: FP16
• Attention implementation: SDPA
• Model objective: Autoregressive multimodal language modeling

Compute Infrastructure

Training was performed using two NVIDIA A100 GPUs and required approximately 450 GPU-hours.

Hardware

• 2 × NVIDIA A100 GPUs

Software

The released checkpoint is compatible with the LLaVA-Qwen architecture.

The associated environment includes:

• srsly~=2.5.1
• nltk~=3.9.1
• flair~=0.15.1
• transformers~=4.56.2
• tqdm~=4.67.1
• numpy~=2.3.3
• torch~=2.8.0
• textdistance~=4.6.3
• datasets~=4.1.1
• pillow~=11.3.0

Bias, Risks, and Limitations

Licensing and Data Usage.

All datasets and pretrained models are subject to their respective licenses, and future users are responsible for complying with their terms. Improper use of copyrighted datasets or proprietary models may result in legal or ethical violations. As noted in our GitHub repository on the license and copyright of content linked from SciGram:

• Images linked from SciGram are copyrighted by their respective owners; the SciGram authors do not host or redistribute them.
• Image URLs are publicly available on the internet and were not scraped from private sources.
• We respected robots.txt rules and site Terms of Service (ToS) during URL collection.
• SciGram is intended for educational and research purposes only; its creators do not claim ownership of linked content.
• SciGram released under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0).

Bias and Fairness.

Pretrained models may reflect biases in their training data. Although our study focuses on diagram reasoning, such biases may affect downstream outputs, potentially disadvantaging certain groups or misrepresenting information. Users should consider these risks when deploying similar models. Environmental Impact. Training and fine-tuning large models are computationally expensive and contribute to carbon emissions. We encourage efficient training strategies and consideration of environmental costs when developing similar systems. Misuse Potential. Although intended for research and educational purposes, our approach could be misused for automated content generation or misinformation. Appropriate safeguards and ethical guidelines should be followed to minimize potential harm.

Citation

If you use SciGram-OV-7B or the SciGram dataset, please cite the accompanying paper:

BibTeX:

@inproceedings{
  ortega2026from,
  title={From Terminology to Diagrams: Visual-Instruction Generation for Scientific Diagram Understanding},
  author={Raúl Ortega and José Manuel Gómez-Pérez},
  booktitle={Third Conference on Language Modeling},
  year={2026},
  url={https://openreview.net/forum?id=Xdi2q5XKgB}
}

APA:

Ortega, R., & Gómez-Pérez, J. M. (2026). From Terminology to Diagrams: Visual-Instruction Generation for Scientific Diagram Understanding. Proceedings of the Conference on Language Modeling (COLM 2026).

Model Card Contact

For questions concerning the model or dataset, please contact rortega@expert.ai or jmgomez@expert.ai.