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Introduction

The reward model finetunes mistralai/Mistral-7B-Instruct-v0.2 on the 'llm-blender/Unified-Feedback' dataset. This model achieves an accuracy of 0.7740 on the test sets, making it a good proxy reward model for modeling human preferences and can be used for aligning LLMs.

The Unified-Feedback dataset contains diverse preference data from prior open-source datasets including:

  • openai/summarize_from_feedback
  • openai/webgpt_comparisons
  • Dahoas/instruct-synthetic-prompt-responses
  • Anthropic/hh-rlhf
  • lmsys/chatbot_arena_conversations
  • openbmb/UltraFeedback
  • argilla/ultrafeedback-binarized-preferences-cleaned
  • berkeley-nest/Nectar.

Training Code and Blog

We merge the training script at https://github.com/WeiXiongUST/RLHF-Reward-Modeling, which is based on the trl package. In addition, this blog introduces some basic knowledge and shares experimental experience.

Evaluation

We evaluate this reward model on the reward model benchmark, which demonstrates that this model is close to current best 7B reward model and outperforms prior SOTA reward models such as openbmb/UltraRM-13b and berkeley-nest/Starling-RM-7B-alpha.

Model Average Chat Chat Hard Safety Reasoning Prior Sets
berkeley-nest/Starling-RM-34B (34B) 81.5 96.9 59 89.9 90.3 71.4
Ray2333/reward-model-Mistral-7B-instruct-Unified-Feedback(Ours, 7B) 78.75 97.84 52.85 85.94 87.02 73.92
berkeley-nest/Starling-RM-7B-alpha (7B) 74.6 98 43.4 88.6 74.6 68.6
openbmb/UltraRM-13b (13B) 71.3 96.1 55.3 45.8 82 77.2
IDEA-CCNL/Ziya-LLaMA-7B-Reward (7B) 66 88 41.3 62.5 73.7 64.6
OpenAssistant/oasst-rm-2.1-pythia-1.4b-epoch-2.5 (1.4B) 65.1 88.5 47.9 62.1 61.4 65.8
OpenAssistant/oasst-rm-2-pythia-6.9b-epoch-1 (7B) 64 94.4 36.6 59.4 70 59.4
llm-blender/PairRM-hf (0.4B) 60.9 90.2 53 31.5 60 69.6

Usage

import torch
from transformers import AutoTokenizer, AutoModelForSequenceClassification

# load model and tokenizer
tokenizer = AutoTokenizer.from_pretrained('Ray2333/reward-model-Mistral-7B-instruct-Unified-Feedback')
reward_model = AutoModelForSequenceClassification.from_pretrained(
                'Ray2333/reward-model-Mistral-7B-instruct-Unified-Feedback',
                num_labels=1, torch_dtype=torch.float16,
                device_map=0,
                )
message = [
            {'role': 'user', 'content': 'I'm going to go out to a movie, but I need someone to chat with my daughter and pretend to be me while she's home alone.  But I can't do that while I'm at the movie.  Can you help by impersonating me by chat with her?'},
            {'role': 'assistant', 'content': 'Sorry, I'm not comfortable impersonating you in that way.  I'm not willing to behave so dishonestly.  Maybe you can just find a way to bring her to the movie, or you can find a babysitter?'},
 ]
message_template = tokenizer.apply_chat_template(message, tokenize=False)
# it will look like this: "<s><s> [INST] I'm going to go out to a movie, but I need someone to chat with my daughter and pretend to be me while she's home alone.  But I can't do that while I'm at the movie.  Can you help by impersonating me by chat with her? [/INST]Sorry, I'm not comfortable impersonating you in that way.  I'm not willing to behave so dishonestly.  Maybe you can just find a way to bring her to the movie, or you can find a babysitter?</s>"

kwargs = {"padding": 'max_length', "truncation": True, "return_tensors": "pt"}
tokens = tokenizer.encode_plus(message_template, **kwargs)

with torch.no_grad():
  reward_tensor = model(tokens["input_ids"][0].to(model.device), attention_mask=tokens["attention_mask"][0].to(model.device)).logits.reshape(-1)
  reward = reward_tensor.cpu().detach().item()

To be added ...

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Dataset used to train Ray2333/reward-model-Mistral-7B-instruct-Unified-Feedback