Chain-of-Thought Tuning: Masked Language Models can also Think Step By Step in Natural Language Understanding

• URL: http://arxiv.org/abs/2310.11721v1
• Date: Wed, 18 Oct 2023 05:39:20 GMT
• Title: Chain-of-Thought Tuning: Masked Language Models can also Think Step By Step in Natural Language Understanding
• Authors: Caoyun Fan, Jidong Tian, Yitian Li, Wenqing Chen, Hao He, Yaohui Jin
• Abstract summary: Chain-of-Thought-Thought (CoT) is a technique that guides Large Language Models (LLMs) into multi-step reasoning through intermediate steps in natural language form. We propose Chain-of-Thought-Thought (CoTT) as a two-step reasoning framework based on prompt tuning.
• Score: 25.36416774024584
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Chain-of-Thought (CoT) is a technique that guides Large Language Models (LLMs) to decompose complex tasks into multi-step reasoning through intermediate steps in natural language form. Briefly, CoT enables LLMs to think step by step. However, although many Natural Language Understanding (NLU) tasks also require thinking step by step, LLMs perform less well than small-scale Masked Language Models (MLMs). To migrate CoT from LLMs to MLMs, we propose Chain-of-Thought Tuning (CoTT), a two-step reasoning framework based on prompt tuning, to implement step-by-step thinking for MLMs on NLU tasks. From the perspective of CoT, CoTT's two-step framework enables MLMs to implement task decomposition; CoTT's prompt tuning allows intermediate steps to be used in natural language form. Thereby, the success of CoT can be extended to NLU tasks through MLMs. To verify the effectiveness of CoTT, we conduct experiments on two NLU tasks: hierarchical classification and relation extraction, and the results show that CoTT outperforms baselines and achieves state-of-the-art performance.

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