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. 1997 Dec 23;94(26):14220–14224. doi: 10.1073/pnas.94.26.14220

Figure 2.

Figure 2

(A) The two-spirals problem. The 192 training cases correspond to the 192 points. For each case the two input values are the x and y coordinates of the point, and the ideal output value is either 0 or 1, depending on which spiral the point lies on. (B) Profile of the error surface corresponding to variation in one connection with the remaining connections at fixed values.