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Modeling Events with Cascades of Poisson Processes
Proceedings of the 26th Conference on Uncertainty in Artificial Intelligence, PMLR R8:545-554, 2010.
Abstract
We present a probabilistic model of events in continuous time in which each event triggers a Poisson process of successor events. The ensemble of observed events is thereby mod- eled as a superposition of Poisson processes. Efficient inference is feasible under this model with an EM algorithm. Moreover, the EM al- gorithm can be implemented as a distributed algorithm, permitting the model to be ap- plied to very large datasets. We apply these techniques to the modeling of Twitter mes- sages and the revision history of Wikipedia.