correction doc in gromov.py

Author: rflamary

ot/gromov.py

@@ -39,7 +39,7 @@ def init_matrix(C1, C2, T, p, q, loss_fun='square_loss'):
             * h1(a)=a
             * h2(b)=b
 
-    The kl-loss function L(a,b)=(1/2)*|a-b|^2 is read as :
+    The kl-loss function L(a,b)=a*log(a/b)-a+b is read as :
         L(a,b) = f1(a)+f2(b)-h1(a)*h2(b) with :
             * f1(a)=a*log(a)-a
             * f2(b)=b