Decomposition of Small Transformer Models

arXiv — cs.LGThursday, November 13, 2025 at 5:00:00 AM
The recent study on the decomposition of small Transformer models highlights a significant advancement in mechanistic interpretability, particularly through the application of Stochastic Parameter Decomposition (SPD). This method has been successfully extended to real models, such as GPT-2-small, where it not only decomposed a toy induction-head model but also identified subcomponents linked to interpretable concepts like 'golf' and 'basketball'. These findings are pivotal as they bridge the gap between theoretical toy models and practical applications, enhancing our understanding of AI mechanisms. By surfacing interpretable parameter-space mechanisms, this research contributes to the ongoing efforts to make AI systems more transparent and reliable, which is essential for their integration into real-world scenarios.
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