[trainer] corrected small bug in CNNTrainer

bob/learn/pytorch/trainers/CNNTrainer.py

@@ -197,7 +197,7 @@ class CNNTrainer(object):
       
       start_epoch, start_iter, losses = self.load_and_initialize_model(model)
       if start_epoch != 0: 
-        logger.info('Previous network was trained up to epoch {}, iteration {}'.format(start_epoch, start_iter, losses[-1]))
+        logger.info('Previous network was trained up to epoch {}, iteration {}'.format(start_epoch, start_iter))
         if losses:
           logger.info('Last loss = {}'.format(losses[-1]))
       else: