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Recalcitrance refers to the quality of being obstinately defiant of authority or restraint, or the trait of being difficult to manage or control. It essentially describes a stubborn unwillingness to comply or cooperate. source
As depicted above but within AI it has its own meaning.
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Recalcitrance is defined as the inverse of the rate of increase to intelligence per time per unit of effort put into increasing that intelligence. source 4th item down.
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An AI system's Recalcitrance can be defined as the resistance to improvements in model accuracy in relation to the efforts put into maximizing it's [sic] prediction accuracy.
A few lines down from the blurred photo - source
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It is meant to capture how hard it is to make an intelligent system smarter, and in particular how hard it is for an intelligent system to make itself smarter. source just above Digifesto.
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