arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.07064cs.DB
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Web上的数据索引:数据搜索的模式级索引的比较-扩展技术报告

Indexing Data on the Web: A Comparison of Schema-level Indices for Data Search -- Extended Technical Report

Till Blume, Ansgar Scherp

摘要:

为数据网编制索引提供了许多机会,特别是查找和探索数据源的机会。索引Web of Data时的一个主要设计决策是找到合适的索引模型,即,如何索引和汇总数据。已经进行了各种努力来为给定任务开发具体的指数模型。由于每个索引模型都是独立设计、实现和评估的,因此仍然很难判断一种方法是否可以很好地推广到另一个任务、查询集或数据集。在这项工作中,我们经验性地评估六个具有代表性的指数模型与独特的功能组合。其中包括一个新的索引模型,它结合了RDFS和owl:sameAs的推理。我们首次将所有索引模型实现为一个基于流的框架。我们评估的索引模型的变化,考虑子图的大小为0,1,和2跳两个大的,现实世界的数据集。我们评估的压缩比,摘要比,和F1分数表示的近似质量的基于流的索引计算的指数的质量。实验揭示了不同索引模型、查询和数据集的压缩比、摘要比和近似质量的巨大差异。然而,我们在结果中观察到有意义的相关性,这些相关性有助于为给定的任务、查询类型和数据集确定正确的索引模型。

英文摘要:

Indexing the Web of Data offers many opportunities, in particular, to find and explore data sources. One major design decision when indexing the Web of Data is to find a suitable index model, i.e., how to index and summarize data. Various efforts have been conducted to develop specific index models for a given task. With each index model designed, implemented, and evaluated independently, it remains difficult to judge whether an approach generalizes well to another task, set of queries, or dataset. In this work, we empirically evaluate six representative index models with unique feature combinations. Among them is a new index model incorporating inferencing over RDFS and owl:sameAs. We implement all index models for the first time into a single, stream-based framework. We evaluate variations of the index models considering sub-graphs of size 0, 1, and 2 hops on two large, real-world datasets. We evaluate the quality of the indices regarding the compression ratio, summarization ratio, and F1-score denoting the approximation quality of the stream-based index computation. The experiments reveal huge variations in compression ratio, summarization ratio, and approximation quality for different index models, queries, and datasets. However, we observe meaningful correlations in the results that help to determine the right index model for a given task, type of query, and dataset.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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