Merge branch 'master' into doc_travis

1 files changed, 6 insertions, 0 deletions

diff --git a/ot/utils.py b/ot/utils.py
index c154f99..f9911a1 100644
--- a/ot/utils.py
+++ b/ot/utils.py
@@ -49,6 +49,12 @@ def kernel(x1, x2, method='gaussian', sigma=1, **kwargs):
     return K
 
 
+def laplacian(x):
+    """Compute Laplacian matrix"""
+    L = np.diag(np.sum(x, axis=0)) - x
+    return L
+
+
 def unif(n):
     """ return a uniform histogram of length n (simplex)