add davibarreira's sinkhorn_divergence with some modifications

Project.toml

@@ -28,6 +28,7 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 
 [targets]
-test = ["Distances", "ForwardDiff", "ReverseDiff", "Pkg", "PythonOT", "Random", "SafeTestsets", "Test"]
+test = ["Distances", "ForwardDiff", "ReverseDiff", "Pkg", "PythonOT", "Random", "SafeTestsets", "Test", "StatsBase"]

docs/src/index.md

@@ -29,6 +29,7 @@ squared2wasserstein
 ```@docs
 sinkhorn
 sinkhorn2
+sinkhorn_divergence
 sinkhorn_barycenter
 ```