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arXiv · 2510.15620

On-device Semantic Selection Made Low Latency and Memory Efficient with Monolithic Forwarding

Jiahao Zhou·Chengliang Lin·Dingji Li·Mingkai Dong·Haibo Chen
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Abstract

Semantic top-K selection with cross-encoder rerankers underpins on-device AI services, such as retrieval-augmented generation, agent memory, and personalized recommendation. However, its latency and memory demands dominate end-to-end budgets on edge hardware. Revisiting the objective of top-K selection, we reveal that only relative rankings matter, not exact per-candidate scores. We further observe sequence-level sparsity: relative rankings progressively stabilize in intermediate layers, enabling early pruning prior to completing full inference. Building on this insight, we propose monolithic forwarding and develop a training-free inference system, PRISM. By maintaining a global view of all candidates, it reduces latency through progressive cluster pruning. It also bounds peak memory usage by strategically overlapping I/O with computation via overlapped layer streaming and chunked execution. We evaluate PRISM against state-of-the-art baselines on rerankers from 0.6 B to 8 B parameters across Apple M2 and RTX 5070. PRISM consistently reduces latency by up to 89.2% and peak memory by up to 91.3% in microbenchmarks, without compromising precision. Across three real-world on-device AI applications, PRISM lowers latency by 11.6%-51.0% and peak memory by 18.6%-77.8%, demonstrating substantial improvements in efficiency and deployability.

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Jiahao Zhou, Chengliang Lin, Dingji Li, Mingkai Dong, Haibo Chen. 2026-03-24. On-device Semantic Selection Made Low Latency and Memory Efficient with Monolithic Forwarding. https://arxiv.org/abs/2510.15620

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