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. 2016 Feb 9;10:28. doi: 10.3389/fnins.2016.00028

Figure 2.

Figure 2

Graphical representation of a reproducing kernel Hilbert space defined on spike trains using the Schoenberg kernel. Spike trains are transformed into a high dimensional feature space (Hilbert space). Applying the kernel trick allows inner products in this space to be computed without explicit reference to the feature vectors.