From 6bab15ceeebc03bf9e858632b7823ac52d881bc2 Mon Sep 17 00:00:00 2001
From: Zaccharie Ramzi <zaccharie.ramzi@gmail.com>
Date: Wed, 20 Mar 2019 14:32:17 +0100
Subject: [PATCH] changed from dot to vdot in fista restarting criterion

---
 modopt/opt/algorithms.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/modopt/opt/algorithms.py b/modopt/opt/algorithms.py
index 9b768b3c..7e301d60 100644
--- a/modopt/opt/algorithms.py
+++ b/modopt/opt/algorithms.py
@@ -393,10 +393,7 @@ def is_restart(self, z_old, x_new, x_old):
         """
         if self.restart_strategy is None:
             return False
-        criterion = np.dot(
-            (z_old - x_new).flatten(),
-            (x_new - x_old).flatten(),
-        ) >= 0
+        criterion = np.vdot(z_old - x_new, x_new - x_old) >= 0
         if criterion:
             if 'adaptive' in self.restart_strategy:
                 self.r_lazy *= self.xi_restart