FIG. 1. (a) Scheme of an artificial neuron cell. (b) The cell transfer function (line) fitted to sigmoid and hyperbolic tangent functions (dots). Scaling of the functions (2) is shown in the figure. The transfer function fout(fin) is normalized by 2πlout=(la þ 2lout) and shifted by 2π(la þ lout)=(la þ 2lout) on the flux axis to fit (2a), and normalized to πlout=(la þ 2lout) with no additional shift on flux axis to fit (2b). The optimal values of parameters are l ¼ 0:125, lout ¼ 0:3, la ¼ 1:125. Consistency of curves in both cases is at the level of 10 3. Hyperbolic tangent activation function is fitted with π shift in the Josephson junction CPR (1).
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