用多尺度张量网络压缩喷注数据,提升异常检测能力。
Quantum-Inspired Tensor Network Autoencoders for Anomaly Detection: A MERA-Based Approach
- 基于MERA结构设计层级压缩自动编码器,保留局部关联性。
- 在强压缩瓶颈下,MERA的解纠缠层显著提升检测性能。
- 适合对粒子物理中喷注异常检测感兴趣的读者。
我们研究多尺度张量网络架构是否能为对撞机喷注的重建式异常检测提供有益的归纳偏置。喷注由级联分支产生,其内部结构天然具有角动量尺度上的层次组织。这启发我们设计一种分层压缩、可重排短程相关性的自编码器。受此启发,我们提出了一个直接作用于有序喷注组分的MERA-inspired自编码器。据我们所知,这是首个将MERA结构引入对撞机异常检测的尝试。我们在统一的仅背景重建框架下,将其与密集自编码器、树张量网络极限及经典基线进行对比。论文围绕两个核心问题展开:数据是否真正支持局域性感知的层级压缩?MERA的解纠缠层是否超越简单树结构?通过基准对比、免训练的局域可压缩性诊断和直接的身份解纠缠消融实验,结果表明,保持局域性的多尺度结构与喷注数据高度匹配,且当压缩瓶颈最强时,MERA解纠缠层开始发挥优势。总体而言,该研究支持局域性感知的层级压缩作为喷注异常检测的有效归纳偏置。
原文摘要 · Abstract (English)
We investigate whether a multiscale tensor-network architecture can provide a useful inductive bias for reconstruction-based anomaly detection in collider jets. Jets are produced by a branching cascade, so their internal structure is naturally organised across angular and momentum scales. This motivates an autoencoder that compresses information hierarchically and can reorganise short-range correlations before coarse-graining. Guided by this picture, we formulate a MERA-inspired autoencoder acting directly on ordered jet constituents. To the best of our knowledge, a MERA-inspired autoencoder has not previously been proposed, and this architecture has not been explored in collider anomaly detection. We compare this architecture to a dense autoencoder, the corresponding tree-tensor-network limit, and standard classical baselines within a common background-only reconstruction framework. The paper is organised around two main questions: whether locality-aware hierarchical compression is genuinely supported by the data, and whether the disentangling layers of MERA contribute beyond a simpler tree hierarchy. To address these questions, we combine benchmark comparisons with a training-free local-compressibility diagnostic and a direct identity-disentangler ablation. The resulting picture is that the locality-preserving multiscale structure is well matched to jet data, and that the MERA disentanglers become beneficial precisely when the compression bottleneck is strongest. Overall, the study supports locality-aware hierarchical compression as a useful inductive bias for jet anomaly detection.
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