Figure 3. Prediction error in a time-series prediction task.

(a) Dependence on laser diode current using 10 dB feedback attenuation. (b) Dependence on feedback attenuation using I_b=7.9 mA. The prediction error increases dramatically for I_b>8.9 mA, when the laser rest state becomes unstable. The importance of memory for time-series prediction can be seen in the lower panel, where the prediction error rapidly increases for a reduced feedback strength. Red error bars give the s.d. between three independent measurements. Blue error bars represent the s.d. for different training/testing partitions of the data.