Add SymmetricMvLaplace
distribution
#2004
Open
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As per title, I needed a multivariate Laplace distribution in some applications,
Distributions.jl
didn't seem to have it, so here is one of its versions (of the few possible). This PR follows the mathematical description provided here. A lot of the code is based onMvNormal
implementation because externally they have lots of similarities.Stuff done/to do (trying to follow the requirements outlined in the docs:
length
sampler
- it wasn't immediately obvious to me that a more efficient sampler for batches exists, so I didn't implement one. If I am missing something, please let me know and I'll try to implement it.eltype
Distributions._rand!
Distributions._logpdf
mean
var
cov
invcov
Feedback welcome!