[MRG] Gromov barycenter example bug (#425)

* bug solve

* releases.md

Author: ncassereau

RELEASES.md

@@ -32,6 +32,8 @@ roughly 2^31) (PR #381)
 - Fixed weak optimal transport docstring (Issue #404, PR #410)
 - Fixed error whith parameter `log=True`for `SinkhornLpl1Transport` (Issue #412, 
 PR #413)
+- Fixed a bug breaking an example where we would try to make an array of arrays of different shapes (Issue #424, PR #425)
+
 
 ## 0.8.2
 

examples/gromov/plot_gromov_barycenter.py

@@ -110,8 +110,7 @@ def im2mat(img):
             if shapes[nb][i, j] < 0.95:
                 xs[nb].append([j, 8 - i])
 
-xs = np.array([np.array(xs[0]), np.array(xs[1]),
-               np.array(xs[2]), np.array(xs[3])])
+xs = [np.array(xs[s]) for s in range(S)]
 
 ##############################################################################
 # Barycenter computation