[trainer] modified docstrings (list) for the CNNTrainer

bob/learn/pytorch/trainers/CNNTrainer.py

@@ -71,7 +71,7 @@ class CNNTrainer(object):
       The epoch to start with
     start_iteration: int
       The iteration to start with
-    losses: list
+    losses: list(float)
       The list of losses from previous training 
     
     """
@@ -95,7 +95,7 @@ class CNNTrainer(object):
       the current epoch
     iteration: int
       the current (last) iteration
-    losses: list
+    losses: list(float)
         The list of losses since the beginning of training 
     
     """