Sunshine279/gammaPO-llama-3-8b-instruct

Model Details

Model Description

We fine-tuned meta-llama/Meta-Llama-3-8B-Instruct on princeton-nlp/llama3-ultrafeedback-armorm with the gamma-SimPO objective.

• Developed by: Jie Sun, Junkang Wu, Jiancan Wu, Zhibo Zhu, Xingyu Lu, Jun Zhou, Lintao Ma, Xiang Wang

• Model type: Causal Language Model

• License: gemma

• Finetuned from model: meta-llama/Meta-Llama-3-8B-Instruct

Model Sources

• Repository: https://github.com/sunjie279/gammaPO

• Paper: https://arxiv.org/pdf/2506.03690

How to Get Started with the Model

import torch
from transformers import pipeline

model_id = "Sunshine279/gammaPO-llama-3-8b-instruct"

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 hyperparameters

The following hyperparameters were used during training:

• learning_rate: 1e-06
• train_batch_size: 2
• eval_batch_size: 4
• seed: 42
• distributed_type: multi-GPU
• num_devices: 4
• gradient_accumulation_steps: 16
• total_train_batch_size: 128
• total_eval_batch_size: 16
• optimizer: Adam with betas=(0.9,0.999) and epsilon=1e-08
• lr_scheduler_type: cosine
• lr_scheduler_warmup_ratio: 0.1
• num_epochs: 1

Training results

Training Loss	Epoch	Step	Validation Loss	Rewards/chosen	Rewards/rejected	Rewards/accuracies	Rewards/margins	Logps/rejected	Logps/chosen	Logits/rejected	Logits/chosen
1.1544	0.8550	400	1.1389	-20.8453	-29.4063	0.8679	8.5610	-2.9406	-2.0845	-1.7197	-1.7101

Framework versions

• Transformers 4.42.4
• Pytorch 2.3.0+cu121
• Datasets 2.20.0
• Tokenizers 0.19.1