arXiv Computer Vision By Nikita Gabdullin, Anton Raskovalov

Latent space configuration for neural network finetuning, fast ranking, and embedding dimensionality reduction

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The paper introduces Latent Space Configuration (LSC) for fine‑tuning neural networks, enabling the creation of structured latent spaces that accelerate top‑K retrieval with O(1) candidate search. Using ArcFace‑pretrained IResNet50 models, the authors demonstrate up to three‑fold GPU speed‑ups and 40% CPU speed‑ups over exhaustive search, while also showing that reducing latent space dimensionality further speeds up queries and can improve rank‑N metrics.

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arXiv Machine Learning
Oct 5

Learning Query Encoders Can Be Hard Even When Vector Retrieval Is Geometrically Easy

The paper investigates the geometric capacity of vector retrieval systems, focusing on the maximum recall achievable with a fixed document index. It demonstrates that, on real-world benchmarks, single-vector query encoders often underperform relative to the index’s potential. The authors provide theoretical evidence that learning such encoders can be computationally hard, constructing a task where a simple neural network can achieve perfect recall while any statistical-query learner would need exponentially many queries to surpass random chance.

By Anders Wikum, Nina Mishra, Amin Saberi, Tal Wagner