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Softmax output of for three sleep stages (Wake, REM, N3).
This figure illustrates that the softmax output spans a hyper-plane (in 3D a 2D hyper-plane with 3 corners). It can be seen that the sleep stage N3 is not confused with the Wake or the REM state. Note that absolute coordinates of points in MDS projections have no particular meaning other than scaling relative distances between any pair of points.
