提出新框架评估空间标注相似性,兼顾标签匹配与拓扑结构。
A Methodological Framework for Measuring Spatial Labeling Similarity
- 将空间标注转为图结构,融合位置与属性信息
- 通过图属性分布差异衡量标注相似性,精度优于传统方法
- 适用于空间转录组等科学场景,可精准评估标注质量
空间标注通过为特定位置分配标签来描述其空间属性与关系,在科研与实践中应用广泛。衡量两个空间标注的相似性对理解其差异及成因(如位置属性变化或标注方法不同)至关重要。现有方法常忽略标签匹配数量、空间分布拓扑结构以及不匹配标签的异质影响。为此,我们提出一种方法论框架,指导开发满足这些要求的度量方法。给定两个空间标注,该框架基于位置组织、标签及属性(如位置重要性)将其转换为图结构,提取图属性分布,进而高效计算分布差异以反映两标注间的不相似程度。我们进一步实现该框架的具体算法——空间标注类比度量(SLAM),并分析其理论基础,用于评估空间转录组(ST)标注结果与真实标注的相似性。通过模拟与真实ST数据的多组实验,验证了SLAM相比其他成熟评估指标能更全面准确地反映标注质量。代码开源:https://github.com/YihDu/SLAM。
原文摘要 · Abstract (English)
Spatial labeling assigns labels to specific spatial locations to characterize their spatial properties and relationships, with broad applications in scientific research and practice. Measuring the similarity between two spatial labelings is essential for understanding their differences and the contributing factors, such as changes in location properties or labeling methods. An adequate and unbiased measurement of spatial labeling similarity should consider the number of matched labels (label agreement), the topology of spatial label distribution, and the heterogeneous impacts of mismatched labels. However, existing methods often fail to account for all these aspects. To address this gap, we propose a methodological framework to guide the development of methods that meet these requirements. Given two spatial labelings, the framework transforms them into graphs based on location organization, labels, and attributes (e.g., location significance). The distributions of their graph attributes are then extracted, enabling an efficient computation of distributional discrepancy to reflect the dissimilarity level between the two labelings. We further provide a concrete implementation of this framework, termed Spatial Labeling Analogy Metric (SLAM), along with an analysis of its theoretical foundation, for evaluating spatial labeling results in spatial transcriptomics (ST) \textit{as per} their similarity with ground truth labeling. Through a series of carefully designed experimental cases involving both simulated and real ST data, we demonstrate that SLAM provides a comprehensive and accurate reflection of labeling quality compared to other well-established evaluation metrics. Our code is available at https://github.com/YihDu/SLAM.
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