jiazhengli/Pythia-2.8B-TLDR-Iterative-SamPO

Model Card for Pythia-2.8B-TLDR-Iterative-SamPO

This repository provides a fine-tuned version of Pythia-2.8B, using our proposed SamPO algorithm: Eliminating Biased Length Reliance of Direct Preference Optimization via Down-Sampled KL Divergence.

Performance

Evaluation Details

We test our model with the same GPT-4 Win rate prompt template proposed by the DPO paper. The sampled test set is included in this repo.

Training hyperparameters

The following hyperparameters were used during DPO/SamPO training:

• —DPO beta: 0.5
• —learning_rate: 1e-6
• —totaltrainbatch_size: 128
• —optimizer: AdamW with beta1 0.9, beta2 0.999 and epsilon 1e-8
• —lrschedulertype: linear
• —lrschedulerwarmup_ratio: 0.1
• —Weight Decay: 0.0
• —num_epochs: 1.0