message: update import gudhi.wasserstein
diff: @@ -2,7 +2,7 @@ import ot
  import numpy as np
  import scipy.spatial.distance as sc
  -from wasserstein import _build_dist_matrix, _perstot
  +from gudhi.wasserstein import _build_dist_matrix, _perstot
  # This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
  # See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
  