In uncertain and partially observable environments control policies must be a function of the complete history of actions and observations. Rather than present an ever growing history to a learner, we instead track sufficient statistics of the history and map those to a control policy. The mapping has typically been done using dynamic programming, requiring large amounts of memory. We present a...

Overseas investigations have shown that many healthcare institutions are understocked of antidotes to treat these patients. 1–4 Despite a recent study to the contrary, 5 the paper by Fountain and colleagues, published in this issue of the New Zealand Medical Journal, suggests similar problems in New Zealand hospitals with shortcomings in hospital pharmacy stocks and resupply. 6 The paper raises...

Several reasoning tasks need to scale over the volume of evidence and the entities of interest. A technique used by statisticians is to represent a collection of evidence by the sufficient statistics of the data. This reduces the computation burden on the BN model significantly by representing a large set of records (and therefore nodes) with a single node. However, this procedure is not genera...