arXiv AI By Ekaterina Alimaskina, Gleb Molodtsov, Aleksandr Beznosikov

Analyzing Stream Collapse in Hyper-Connections: From Diagnosis to Mitigation

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arXiv:2606. 03483v1 Announce Type: cross Abstract: Hyper-Connections (HC) replace the single Transformer residual stream with multiple streams, introducing a permutation symmetry over stream indices.

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arXiv Machine Learning
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Dissociating Decodability and Causal Use in Bracket-Sequence Transformers

arXiv:2604. 22128v2 Announce Type: replace-cross Abstract: When trained on tasks requiring an understanding of hierarchical structure, transformers have been found to represent this hierarchy in distinct ways: in the geometry of the residual stream, and in stack-like attention patterns maintaining a last-in, first-out ordering.

By Aryan Sharma, Cutter Dawes, Shivam Raval
arXiv Machine Learning
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xHC: Expanded Hyper-Connections

arXiv:2607. 14530v1 Announce Type: new Abstract: Hyper-Connections (HC) expand the residual stream of Transformers into $N$ parallel streams, providing a form of memory scaling beyond model width and depth.

By Xiangdong Zhang, Xiaohan Qin, Sunan Zou, Tuo Dai, Xiaoming Shi, Huaijin Wu, Yebin Yang, Zhuo Xia, Shaofeng Zhang, Lin Yao, Yuliang Liu, Yu Cheng, Junchi Yan