Mapping out the Space of Human Feedback for Reinforcement Learning: A Conceptual Framework
This work addresses the problem of improving RLHF systems for researchers and practitioners by providing a structured approach, but it is incremental as it builds on existing interactive machine learning efforts without introducing new methods or data.
The paper tackles the limited scope and disregard of human factors in Reinforcement Learning from Human Feedback (RLHF) by developing a conceptual framework that includes a taxonomy of feedback types and quality metrics, aiming to unify human-centered, interface-centered, and model-centered aspects.
Reinforcement Learning from Human feedback (RLHF) has become a powerful tool to fine-tune or train agentic machine learning models. Similar to how humans interact in social contexts, we can use many types of feedback to communicate our preferences, intentions, and knowledge to an RL agent. However, applications of human feedback in RL are often limited in scope and disregard human factors. In this work, we bridge the gap between machine learning and human-computer interaction efforts by developing a shared understanding of human feedback in interactive learning scenarios. We first introduce a taxonomy of feedback types for reward-based learning from human feedback based on nine key dimensions. Our taxonomy allows for unifying human-centered, interface-centered, and model-centered aspects. In addition, we identify seven quality metrics of human feedback influencing both the human ability to express feedback and the agent's ability to learn from the feedback. Based on the feedback taxonomy and quality criteria, we derive requirements and design choices for systems learning from human feedback. We relate these requirements and design choices to existing work in interactive machine learning. In the process, we identify gaps in existing work and future research opportunities. We call for interdisciplinary collaboration to harness the full potential of reinforcement learning with data-driven co-adaptive modeling and varied interaction mechanics.