looped Transformer architecture

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062026-11Two architecture studies advance: Loopback Transformer boosts efficiency, MAC-v2 strengthens pixel-based offline RLarXiv posted two machine learning papers on Nov 6, 2026, proposing the Loopback Transformer and MAC-v2 architectures. The former separates input strength from update weights to achieve lower validation loss with 40-75% of the parameters; the latter combines a reconstruction-free latent world model with action chunking and performs strongly across several vision benchmarks. Both are preprints and have not yet been peer-reviewed.arXiv cs.LG