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From Sparse Dependence to Sparse Attention: Unveiling How Chain-of-Thought Enhances Transformer Sample Efficiency

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arxiv 2410.05459 v2 pith:ERQZIJBH submitted 2024-10-07 cs.LG cs.CLstat.ML

Kaiyue Wen , Huaqing Zhang , Hongzhou Lin , Jingzhao Zhang This is my paper · ORCID
classification cs.LGcs.CLstat.ML
keywords sparseattentionsamplechain-of-thoughtcurrentefficiencyenhancesexpressiveness
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Chain-of-thought (CoT) significantly enhances the reasoning performance of large language models (LLM). While current theoretical studies often attribute this improvement to increased expressiveness and computational capacity, we argue that expressiveness is not the primary limitation in the LLM regime, as current large models will fail on simple tasks. Using a parity-learning setup, we demonstrate that CoT can substantially improve sample efficiency even when the representation power is sufficient. Specifically, with CoT, a transformer can learn the function within polynomial samples, whereas without CoT, the required sample size is exponential. Additionally, we show that CoT simplifies the learning process by introducing sparse sequential dependencies among input tokens, and leads to a sparse and interpretable attention. We validate our theoretical analysis with both synthetic and real-world experiments, confirming that sparsity in attention layers is a key factor of the improvement induced by CoT.

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Cited by 9 Pith papers

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