Bayesian network structure learning from uncertain interventions

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• Kevin Murphy, University of British Columbia
• Tuesday 14 August 2007, 15:00-16:00
• Small public lecture room, Microsoft Research Ltd, 7 J J Thomson Avenue (Off Madingley Road), Cambridge.

If you have a question about this talk, please contact Oliver Williams.

We show how to learn causal structure from data generated by systems subject to perturbations (interventions) with unknown effects. Our approach is to treat the interventions, as well as the other system variables, as random variables, and to learn a joint graph topology using Bayesian inference. This is in contrast to the standard approach, which assumes that the effects of interventions are known. We show that, on a dataset consisting of protein phosphorylation levels measured under various perturbations, learning the targets of intervention results in models that fit the data better than falsely assuming the interventions have known targets. Furthermore, learning the targets of intervention is useful for such tasks as drug and disease target discovery, where we wish to distinguish direct effects from indirect effects. We illustrate the latter by correctly identifying known targets of genetic mutation in various forms of leukemia using microarray expression data. Joint work with Daniel Eaton.

This talk is part of the Microsoft Research Machine Learning and Perception Seminars series.

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