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Dynamics of competitive learning: the role of updates and memory
1Theoretical Science Department, Satyendra Nath Bose National Centre, Block JD Sector 3, Salt Lake, Kolkata 700098, India. ajaz@bose.res.in
Abstract:
We examine the effects of memory and different updating paradigms in a game-theoretic model of competitive learning, where agents are influenced in their choice of strategy by both the choices made by, and the consequent success rates of, their immediate neighbors. We apply parallel and sequential updates in all possible combinations to the two competing rules and find, typically, that the phase diagram of the model consists of a disordered phase separating two ordered phases at coexistence. A major result is that the corresponding critical exponents belong to the generalized universality class of the voter model. When the two strategies are distinct but not too different, we find the expected linear-response behavior as a function of their difference. Finally, we look at the extreme situation when a superior strategy, accompanied by a short memory of earlier outcomes, is pitted against its inverse; interestingly, we find that a long memory of earlier outcomes can occasionally compensate for the choice of a globally inferior strategy.
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