In Markov decision processes, negative rewards are often expressed as costs. A reward of − x is expressed as a cost of x. In supervised learning, cost is used as a synonym for loss.
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(2017). Cost. 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_178
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