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xHC: Expanded Hyper-Connections
xHC expands Transformer hyper-connections beyond four streams via sparse updates and temporal augmentation, improving scaling efficiency. It boosts 18B MoE downstream scores by 4.0 points over mHC with lower compute and reduced memory traffic via xHC-Flash.
Sydney Poster Session 3, Wed, Dec 9, 10:00 AM–1:00 PM, Hall 1-4 · Published 2026 · ▲ 54 on Hugging Face · Code ★ 68
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AI panel: 14 of 20 reviewers recommend it
lenient 3/5
medium 8/10
strict 3/5