arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.05481stat.CO
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基于高斯混合模型的快速函数聚类

Faster Functional Clustering via Gaussian Mixture Models

Hien D Nguyen, Geoffrey J McLachlan, Jeremy F P Ullmann, Andrew L Janke

摘要:

函数式数据分析(FDA)是处理无限维数据的一种重要的现代范式。FDA的一个重要任务是基于模型的聚类,它通过亚群结构将功能群体组织成组。基于模型的函数数据聚类最常见的方法是通过线性混合效应模型的混合。混合线性混合效应模型(MLMM)的方法需要一个计算密集型算法的估计。我们提供了一种新的高斯混合模型(GMM)表征基于模型的聚类问题。我们证明,这种基于GMM的表征允许通过R编程环境中的可用函数应用时,提高MLMM方法的计算速度。GMM方法的理论考虑进行了讨论。一个例子应用到一个数据集的基础上钙成像在幼体斑马鱼的大脑中提供了一个演示的有效性更简单的GMM方法。

英文摘要:

Functional data analysis (FDA) is an important modern paradigm for handling infinite-dimensional data. An important task in FDA is model-based clustering, which organizes functional populations into groups via subpopulation structures. The most common approach for model-based clustering of functional data is via mixtures of linear mixed-effects models. The mixture of linear mixed-effects models (MLMM) approach requires a computationally intensive algorithm for estimation. We provide a novel Gaussian mixture model (GMM) characterization of the model-based clustering problem. We demonstrate that this GMM-based characterization allows for improved computational speeds over the MLMM approach when applied via available functions in the R programming environment. Theoretical considerations for the GMM approach are discussed. An example application to a dataset based upon calcium imaging in the larval zebrafish brain is provided as a demonstration of the effectiveness of the simpler GMM approach.

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