Sparse Approximate Inference for Spatio-Temporal Point Process Models
Sparse Approximate Inference for Spatio-Temporal Point Process Models
复制标题
时空点过程模型的稀疏近似推理
DOI:
10.1080/01621459.2015.1115357
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发表时间:
2017
影响因子:
3.7
通讯作者:
Cseke B
中科院分区:
文献类型:
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作者:
Cseke B
Spatio-temporal log-Gaussian Cox process models play a central role in the analysis of spatially distributed systems in several disciplines. Yet, scalable inference remains computationally challenging both due to the high-resolution modeling generally required and the analytically intractable likelihood function. Here, we exploit the sparsity structure typical of (spatially) discretized log-Gaussian Cox process models by using approximate message-passing algorithms. The proposed algorithms scale well with the state dimension and the length of the temporal horizon with moderate loss in distributional accuracy. They hence provide a flexible and faster alternative to both nonlinear filtering-smoothing type algorithms and to approaches that implement the Laplace method or expectation propagation on (block) sparse latent Gaussian models. We infer the parameters of the latent Gaussian model using a structured variational Bayes approach. We demonstrate the proposed framework on simulation studies with both Gaussian and point-process observations and use it to reconstruct the conflict intensity and dynamics in Afghanistan from the WikiLeaks Afghan War Diary. Supplementary materials for this article are available online.
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影响因子:
5.4
作者:
Andrew Zammit;G. Sanguinetti;V. Kadirkamanathan
通讯作者:
V. Kadirkamanathan
DOI:
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发表时间:
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期刊:
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影响因子:
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作者:
H. Wist;H. Rue
通讯作者:
H. Wist;H. Rue
DOI:
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发表时间:
2011
期刊:
影响因子:
--
作者:
Sebastian Schutte;Nils B. Weidmann
通讯作者:
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影响因子:
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作者:
พงศ์ศักดิ์ บินสมประสงค์
通讯作者:
พงศ์ศักดิ์ บินสมประสงค์
影响因子:
1.5
作者:
Igor Brainman;Sivan Toledo
通讯作者:
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