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Measuring and Controlling Instruction (In)Stability in Language Model Dialogs

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arxiv 2402.10962 v4 pith:W75M2BNH submitted 2024-02-13 cs.CL cs.AIcs.LG

Measuring and Controlling Instruction (In)Stability in Language Model Dialogs

classification cs.CL cs.AIcs.LG
keywords instructionattentionassumptionchatbotsdecaydriftproposestability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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System-prompting is a standard tool for customizing language-model chatbots, enabling them to follow a specific instruction. An implicit assumption in the use of system prompts is that they will be stable, so the chatbot will continue to generate text according to the stipulated instructions for the duration of a conversation. We propose a quantitative benchmark to test this assumption, evaluating instruction stability via self-chats between two instructed chatbots. Testing popular models like LLaMA2-chat-70B and GPT-3.5, we reveal a significant instruction drift within eight rounds of conversations. An empirical and theoretical analysis of this phenomenon suggests the transformer attention mechanism plays a role, due to attention decay over long exchanges. To combat attention decay and instruction drift, we propose a lightweight method called split-softmax, which compares favorably against two strong baselines.

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