gemma-2-9b-it-SimPO Model Card
SimPO (Simple Preference Optimization) is an offline preference optimization algorithm designed to enhance the training of large language models (LLMs) with preference optimization datasets. SimPO aligns the reward function with the generation likelihood, eliminating the need for a reference model and incorporating a target reward margin to boost performance. Please refer to our preprint and github repo for more details.
Model Details
Model Description
We fine-tuned google/gemma-2-9b-it on princeton-nlp/gemma2-ultrafeedback-armorm with the SimPO objective.
- Developed by: Yu Meng, Mengzhou Xia, Danqi Chen
- Model type: Causal Language Model
- License: gemma
- Finetuned from model: google/gemma-2-9b-it
Model Sources
- Repository: https://github.com/princeton-nlp/SimPO
- Paper: https://arxiv.org/pdf/2405.14734
How to Get Started with the Model
import torch
from transformers import pipeline
model_id = "princeton-nlp/gemma-2-9b-it-SimPO"
generator = pipeline(
"text-generation",
model=model_id,
model_kwargs={"torch_dtype": torch.bfloat16},
device="cuda",
)
outputs = generator([{"role": "user", "content": "What's the difference between llamas and alpacas?"}],
do_sample=False,
eos_token_id=[generator.tokenizer.convert_tokens_to_ids("<end_of_turn>"), generator.tokenizer.eos_token_id],
max_new_tokens=200)
print(outputs[0]['generated_text'])
Training Details
Training Data
We use princeton-nlp/gemma2-ultrafeedback-armorm as the preference optimization dataset.
Training Hyperparameters
The hyperparameters used can be found in the training script.
Speeds, Sizes, Times
Fine-tuning the google/gemma-2-9b-it on princeton-nlp/gemma2-ultrafeedback-armorm takes around 100 mins to finish on 8xH100 GPUs.
Evaluation Results
models | AE2 LC | AE2 WR | AE2 Length | AH | AH Length | GSM | GSM Length | MMLU | MMLU Length |
---|---|---|---|---|---|---|---|---|---|
google/gemma-2-9b-it | 51.1 | 38.1 | 1571 | 40.8 | 545 | 87.4 | 395 | 72.7 | 515 |
princeton-nlp/gemma-2-9b-it-DPO | 67.8 | 65.4 | 2016 | 58.9 | 717 | 88.5 | 392 | 72.2 | 624 |
princeton-nlp/gemma-2-9b-it-SimPO | 72.4 | 65.9 | 1833 | 59.1 | 693 | 88.0 | 341 | 72.2 | 441 |
Technical Specifications
Model Architecture and Objective
The model architecture is based on google/gemma-2-9b-it. We use the SimPO training objective proposed in our preprint.
Hardware
We used 8xH100 GPUs for model training.
Software
Training was done using the alignment-handbook library.
Citation
gemma model:
@article{gemma_2024,
title={Gemma},
url={https://www.kaggle.com/m/3301},
DOI={10.34740/KAGGLE/M/3301},
publisher={Kaggle},
author={Gemma Team},
year={2024}
}
SimPO paper:
@article{meng2024simpo,
title={{SimPO}: Simple preference optimization with a reference-free reward},
author={Meng, Yu and Xia, Mengzhou and Chen, Danqi},
journal={arXiv preprint arXiv:2405.14734},
year={2024}
}
UltraFeedback paper:
@article{cui2023ultrafeedback,
title={{UltraFeedback}: Boosting language models with high-quality feedback},
author={Cui, Ganqu and Yuan, Lifan and Ding, Ning and Yao, Guanming and Zhu, Wei and Ni, Yuan and Xie, Guotong and Liu, Zhiyuan and Sun, Maosong},
journal={arXiv preprint arXiv:2310.01377},
year={2023}
}
ArmoRM paper:
@article{wang2024interpretable,
title={Interpretable Preferences via Multi-Objective Reward Modeling and Mixture-of-Experts},
author={Wang, Haoxiang and Xiong, Wei and Xie, Tengyang and Zhao, Han and Zhang, Tong},
journal={arXiv preprint arXiv:2406.12845},
year={2024}
}
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