Distance Queries from Sampled Data: Accurate and Efficient

TL;DR

This paper introduces novel, optimal estimators for accurately computing $L_p$ distances from sampled data, enabling scalable and precise analysis of large datasets with minimal sampling.

Contribution

It develops the first effective estimators for $L_p$ distances applicable to common sampling schemes, improving accuracy and scalability in data analysis.

Findings

Estimators are Pareto optimal in variance.

Accurate distance estimation with small samples.

Scalable performance demonstrated on diverse datasets.

Abstract

Distance queries are a basic tool in data analysis. They are used for detection and localization of change for the purpose of anomaly detection, monitoring, or planning. Distance queries are particularly useful when data sets such as measurements, snapshots of a system, content, traffic matrices, and activity logs are collected repeatedly. Random sampling, which can be efficiently performed over streamed or distributed data, is an important tool for scalable data analysis. The sample constitutes an extremely flexible summary, which naturally supports domain queries and scalable estimation of statistics, which can be specified after the sample is generated. The effectiveness of a sample as a summary, however, hinges on the estimators we have. We derive novel estimators for estimating $L_p$ distance from sampled data. Our estimators apply with the most common weighted sampling schemes: Poisson Probability Proportional to Size (PPS) and its fixed sample size variants. They also apply when the samples of different data sets are independent or coordinated. Our estimators are admissible (Pareto optimal in terms of variance) and have compelling properties. We study the performance of our Manhattan and Euclidean distance ($p=1,2$) estimators on diverse datasets, demonstrating scalability and accuracy even when a small fraction of the data is sampled. Our work, for the first time, facilitates effective distance estimation over sampled data.