In a Markov decision process, decision epochs are sequences of times at which the decision-maker is required to make a decision. In a discrete time Markov decision process, decision epochs occur at regular, fixed intervals, whereas in a continuous time Markov decision process (or semi-Markov decision process), they may occur at randomly distributed intervals.
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(2017). Decision Epoch. In: Sammut, C., Webb, G.I. (eds) Encyclopedia of Machine Learning and Data Mining. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7687-1_198
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