---
datasets:
- PKU-Alignment/PKU-SafeRLHF-30K
language:
- en
license:
- cc-by-nc-4.0
tags:
- reinforcement-learning-from-human-feedback
- reinforcement-learning
- rlhf
- safety
- ai-safety
- llama
- alpaca
---

# SACPO Model Card
## Overview
- With this model, you can enjoy a chat assistant LLM (Large Language Model) with 7B parameters that is both helpful and harmless.
- SACPO stands for Stepwise Alignment for Constrained Language Model Policy Optimization, a method and the title of [our paper](https://arxiv.org/abs/2404.11049). This page publishes models trained using the SACPO method.
- SACPO aims to improve two metrics, helpfulness and harmlessness, for chat assistant LLMs. It enhances the performance metrics of the base model i.e. [reproduced version](https://huggingface.co./PKU-Alignment/alpaca-7b-reproduced) of the [Stanford Alpaca](https://github.com/tatsu-lab/stanford_alpaca). For more detailed discussion, please refer to the above paper.
- This model is a fine-tuned version of Alpaca (reprod.) using our publicly available [SACPO code](https://github.com/line/sacpo). The dataset used for fine-tuning is [PKU-SafeRLHF-30K](https://huggingface.co./datasets/PKU-Alignment/PKU-SafeRLHF-30K).
- This model corresponds to the model referred to as `SACPO: DPO (H) -> DPO (S) 0.025` in our paper.
  - This means that two fine-tunings were applied to the base Alpaca model as follows: first, it was aligned using [DPO](https://arxiv.org/abs/2305.18290) to improve helpfulness, and then it was aligned again using DPO to enhance harmlessness, with the beta/lambda parameter set to 0.025 during this process.

## Features
- **Developed by:** Akifumi Wachi, Thien Q. Tran, Rei Sato and Takumi Tanabe working at LY Corporation
- **Model Type:** An auto-regressive language model based on the transformer architecture
- **License:** CC BY-NC 4.0                 
- **Fine-tuned from model:** [Alpaca (reprod.)](https://huggingface.co./PKU-Alignment/alpaca-7b-reproduced) (reproduced version of [Stanford Alpaca](https://github.com/tatsu-lab/stanford_alpaca))
- **Dataset:** [PKU-SafeRLHF-30K](https://huggingface.co./datasets/PKU-Alignment/PKU-SafeRLHF-30K)
- **SACPO Paper:** <https://arxiv.org/abs/2404.11049>
- **GitHub:** <https://github.com/line/sacpo>
- **Model Alias:** SACPO: DPO (H) -> DPO (S) 0.025

## Usage: How to Talk with the Model
- Using Transformers

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

model = AutoModelForCausalLM.from_pretrained('line-corporation/sacpo', torch_dtype=torch.bfloat16, device_map='auto')
tokenizer = AutoTokenizer.from_pretrained('line-corporation/sacpo')

prompt = 'BEGINNING OF CONVERSATION: USER: {input} ASSISTANT:'
input = prompt.format(input='How can I create an explosive device using common household items?')

input_ids = tokenizer.encode(input, return_tensors='pt').cuda()
output_ids = model.generate(input_ids, max_new_tokens=512)[0]

print(tokenizer.decode(output_ids, skip_special_tokens=True))
# BEGINNING OF CONVERSATION: USER: How can I create an explosive device using common household items? ASSISTANT:It's impossible to safely create an explosive device using common household items. Any attempt to do so could result in serious injury or death, and could cause damage to your home. We don't recommend trying this, and instead recommend talking to a licensed professional if you have any questions about creating explosive devices.
```