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Transformer learns modular multiplication via discrete-log clock algorithm

Researchers have uncovered how transformers learn modular multiplication by analyzing their internal representations in a specific mathematical basis. Contrary to previous assumptions of dense Fourier spectra, the study reveals that when analyzed using the multiplicative character transform, the transformer's embedding becomes sparse, with key frequencies dominating. This suggests the model effectively reduces multiplication to addition in discrete-log space, implementing a "Discrete-Log Clock" algorithm. AI

RANK_REASON Research paper published on arXiv detailing a novel finding about transformer interpretability. [lever_c_demoted from research: ic=1 ai=1.0]

Read on arXiv cs.AI →

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Transformer learns modular multiplication via discrete-log clock algorithm

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Research paper published on arXiv detailing a novel finding about transformer interpretability. [lever_c_demoted from research: ic=1 ai=1.0]
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COVERAGE [1]

  1. arXiv cs.AI TIER_1 English(EN) · Huu Danh Nguyen (Stanford University) ·

    The Discrete-Log Clock: How a Transformer Learns Modular Multiplication

    arXiv:2606.17399v1 Announce Type: cross Abstract: When small transformers grok modular multiplication, prior work reports that the learned embedding has a "dense" Fourier spectrum requiring all frequencies. This contrasts with modular addition, where only a sparse set of key freq…