Papers with IPO
RLHF Algorithms Ranked: An Extensive Evaluation Across Diverse Tasks, Rewards, and Hyperparameters (2025.emnlp-industry)
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Lucas Spangher, Rama Kumar Pasumarthi, Nick Masiewicki, William F. Arnold, Aditi Kaushal, Dale Johnson, Peter Grabowski, Eugene Ie
| Challenge: | Proximal Policy Optimization (PPO) has fallen out of favor for Large Language Models (LLMs), but its complexity and inefficiency have spurred the investigation of simpler alternatives. |
| Approach: | They evaluate 17 RLHF algorithms on two benchmarks, OpenAI’s TL;DR Summarization and Anthropic’s Helpfulness / Harmlessness. |
| Outcome: | The proposed methods are based on OpenAI’s TL;DR Summarization and Anthropic’s Helpfulness / Harmlessness benchmarks with two different reward models and a Rules based reward model. |
IPO: Your Language Model is Secretly a Preference Classifier (2025.acl-long)
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| Challenge: | Reinforcement learning from human feedback (RLHF) is the primary method for aligning large language models with human preferences, but it often incurs significant computational and financial costs due to its reliance on training external reward models or human-labeled preferences. |
| Approach: | They propose an alternative approach that leverages generative LLMs as preference classifiers to reduce the dependence on external reward models or human-labeled preferences. |
| Outcome: | The proposed approach reduces the dependence on external reward models or human-labeled preferences by using generative LLMs as preference classifiers. |
Contrastive Policy Gradient: Aligning LLMs on sequence-level scores in a supervised-friendly fashion (2024.emnlp-main)
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Yannis Flet-Berliac, Nathan Grinsztajn, Florian Strub, Eugene Choi, Bill Wu, Chris Cremer, Arash Ahmadian, Yash Chandak, Mohammad Azar, Olivier Pietquin, Matthieu Geist
| Challenge: | Reinforcement Learning (RL) is a method used to fine tune Large Language Models (LLMs) using a reward model trained from preference data to better align with human judgment. |
| Approach: | They propose a Reinforcement Learning (RL) algorithm that can estimate the optimal policy even from off-policy data. |
| Outcome: | The proposed algorithm can estimate the optimal policy even from off-policy data. |