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Author

Rui Miao

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Preprint Aug 2026

When Refusal Looks Safe: The Refusal-Cue Shortcut in Safety Guard Models

To mitigate the refusal-cue shortcut, sparse complementary masking is adapted as a lightweight post-hoc intervention that identifies and suppresses a small set of shortcut-associated attention heads and MLP neurons without retraining and achieves an approximately 79% relative reduction in response-initial detection failures induced by refusal cues, while preserving standard detection performance.

Yu Feng, Chun-Ting Zang, Chen Shen et al. · 0 citations
Book Open access Aug 2026

Connecting 100K+ GPUs: Building the Communication Stack for Large-Scale LLM Training

This work presents Meta's network architecture and software stack designed to support one of the world's largest RoCE fabrics, currently connecting over 100,000 GPUs across multiple datacenter buildings, and introduces a scalable initialization strategy that reduces startup times by 11× via eager process group creation and O(N) topology discovery.

Hongyi Zeng, Min Si, Pavan Balaji et al. · 0 citations

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