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Smooth Rectifier Linear Unit (SmoothReLU)
The SmoothReLU function is defined as f(x) = log (1 + exp(x)).
Given n feature vectors x 1 = (x 11 , … , x 1p ), ... , x n = (x n1 , … , x np ) of dimension p, the problem is to compute the (n x p)-dimensional matrix Y = (y i j ) n x p such that: