Controllable Safety Alignment: Inference-Time Adaptation to Diverse Safety Requirements
Abstract
The current paradigm for safety alignment of large language models (LLMs) follows a one-size-fits-all approach: the model refuses to interact with any content deemed unsafe by the model provider. This approach lacks flexibility in the face of varying social norms across cultures and regions. In addition, users may have diverse safety needs, making a model with static safety standards too restrictive to be useful, as well as too costly to be re-aligned. We propose Controllable Safety Alignment (CoSA), a framework designed to adapt models to diverse safety requirements without re-training. Instead of aligning a fixed model, we align models to follow safety configs -- free-form natural language descriptions of the desired safety behaviors -- that are provided as part of the system prompt. To adjust model safety behavior, authorized users only need to modify such safety configs at inference time. To enable that, we propose CoSAlign, a data-centric method for aligning LLMs to easily adapt to diverse safety configs. Furthermore, we devise a novel controllability evaluation protocol that considers both helpfulness and configured safety, summarizing them into CoSA-Score, and construct CoSApien, a human-authored benchmark that consists of real-world LLM use cases with diverse safety requirements and corresponding evaluation prompts. We show that CoSAlign leads to substantial gains of controllability over strong baselines including in-context alignment. Our framework encourages better representation and adaptation to pluralistic human values in LLMs, and thereby increasing their practicality.
Community
LLMs are powerful, but their "one-size-fits-all" safety alignment limits flexibility. Safety standards vary across cultures and users—what’s safe in one context might not be in another. 🌍
Instead of a rigid, one-size-fits-all policy, Controllable Safety Alignment (CoSA) trains a model with controllable safety 🛠️ and employ user-provided "safety configs" 📋—natural language descriptions of desired safety behaviors—to guide model safety behavior on the fly. 🚀
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