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JoMA: Demystifying Multilayer Transformers via JOint Dynamics of MLP and Attention
March 18, 2024, 4:42 a.m. | Yuandong Tian, Yiping Wang, Zhenyu Zhang, Beidi Chen, Simon Du
cs.LG updates on arXiv.org arxiv.org
Abstract: We propose Joint MLP/Attention (JoMA) dynamics, a novel mathematical framework to understand the training procedure of multilayer Transformer architectures. This is achieved by integrating out the self-attention layer in Transformers, producing a modified dynamics of MLP layers only. JoMA removes unrealistic assumptions in previous analysis (e.g., lack of residual connection) and predicts that the attention first becomes sparse (to learn salient tokens), then dense (to learn less salient tokens) in the presence of nonlinear activations, …
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