README.md

---
base_model:
- meta-llama/Llama-3.1-8B
datasets:
- MegaScience/MegaScience
language:
- en
license: llama3.1
metrics:
- accuracy
pipeline_tag: text-generation
library_name: transformers
tags:
- science
---

# [MegaScience: Pushing the Frontiers of Post-Training Datasets for Science Reasoning](https://arxiv.org/abs/2507.16812)

**Llama3.1-8B-MegaScience** is a model fine-tuned on **MegaScience**, a large-scale mixture of high-quality open-source scientific datasets totaling 1.25 million instances, as presented in the paper "MegaScience: Pushing the Frontiers of Post-Training Datasets for Science Reasoning". The MegaScience dataset features truthful reference answers extracted from 12k university-level scientific textbooks, comprising 650k reasoning questions spanning 7 scientific disciplines. This model significantly outperforms corresponding official instruct models in average performance on scientific reasoning tasks and exhibits greater effectiveness for larger and stronger models, suggesting a scaling benefit for scientific tuning.

For more details on the project, including the data curation pipeline and evaluation system, visit the [official GitHub repository](https://github.com/GAIR-NLP/lm-open-science-evaluation).

## Llama3.1-8B-MegaScience

### Training Recipe

- **LR**: 5e-6
- **LR Schedule**: Cosine
- **Batch Size**: 512
- **Max Length**: 4,096
- **Warm Up Ratio**: 0.05
- **Epochs**: 3

### Evaluation Results

<div style="display: flex; justify-content: left; gap: 20px;">
<img src="https://cdn-uploads.huggingface.co/production/uploads/616bfc2b40e2f69baa1c7add/abIVZ2XB9D-o-TCyvOkDE.png" alt="Data Pipeline" style="width:80%;">
</div>

<div style="display: flex; justify-content: left; gap: 20px;">
<img src="https://cdn-uploads.huggingface.co/production/uploads/616bfc2b40e2f69baa1c7add/xFTJ7nevc3S4UYJxUS7ue.png" alt="Data Pipeline" style="width:80%;">
</div>

### More about MegaScience

<div style="display: flex; justify-content: left; gap: 20px;">
<img src="https://cdn-uploads.huggingface.co/production/uploads/616bfc2b40e2f69baa1c7add/VogIpBbjfNxXFP9DfVMms.png" alt="Data Pipeline" style="width:100%;">
</div>

### Usage

You can use the model with the `transformers` library:

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

model_id = "MegaScience/Llama3.1-8B-MegaScience"

tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

messages = [
    {"role": "user", "content": "Explain the concept of quantum entanglement."},
]

input_ids = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    return_tensors="pt"
).to(model.device)

outputs = model.generate(
    input_ids,
    max_new_tokens=512,
    eos_token_id=tokenizer.eos_token_id,
    do_sample=True,
    temperature=0.7,
    top_p=0.9
)
response = tokenizer.decode(outputs[0], skip_special_tokens=True)
print(response)
```

## Citation

Check out our [paper](https://arxiv.org/abs/2507.16812) for more details. If you use our dataset or find our work useful, please cite

```
@article{fan2025megascience,
  title={MegaScience: Pushing the Frontiers of Post-Training Datasets for Science Reasoning},
  author={Fan, Run-Ze and Wang, Zengzhi and Liu, Pengfei},
  year={2025},
  journal={arXiv preprint arXiv:2507.16812},
  url={https://arxiv.org/abs/2507.16812}
}
```