On Stochastic Belief Revision and Update and their Combination
This work addresses belief change in AI systems, but it is incremental as it extends existing qualitative models to a quantitative framework.
The paper tackles the problem of how an agent should change its probabilistic beliefs when new information is observed, by proposing a unified quantitative model that combines revision and update processes, and evaluates it against rationality postulates.
I propose a framework for an agent to change its probabilistic beliefs when a new piece of propositional information $α$ is observed. Traditionally, belief change occurs by either a revision process or by an update process, depending on whether the agent is informed with $α$ in a static world or, respectively, whether $α$ is a 'signal' from the environment due to an event occurring. Boutilier suggested a unified model of qualitative belief change, which "combines aspects of revision and update, providing a more realistic characterization of belief change." In this paper, I propose a unified model of quantitative belief change, where an agent's beliefs are represented as a probability distribution over possible worlds. As does Boutilier, I take a dynamical systems perspective. The proposed approach is evaluated against several rationality postulated, and some properties of the approach are worked out.