[MRG] Implement Sinkhorn in log-domain for WDA by jakubzadrozny · Pull Request #336 · PythonOT/POT
* for small values of the regularization parameter (reg) the current implementation runs into numerical issues (nans and infs) * this can be resolved by using log-domain implementation of the sinkhorn algorithm
* use the standard Sinkhorn solver by default (faster) * use log-domain Sinkhorn if asked by the user
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