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Laplace distribution operator for L1 regularisation

Vincent Eberle requested to merge laplace_op into NIFTy_7

Laplace Distribution

First draft for a laplace distribution operator. Up to now it produces a laplace distribution:
p(x) = 1/(2*sigma) * exp(-1*abs(x-mu)/sigma) with mu = 0 and sigma = 1, by default.

Now the operator transforms the Gaussian distribution to a uniform distribution and then to a laplace. If there is a computational more efficient way, I could incorperate this (@parras @mtr)

Edited by Philipp Arras

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