Fix Keras engine topology to saving

mrcnn/model.py

@@ -2094,7 +2094,7 @@ class MaskRCNN():
         exlude: list of layer names to excluce
         """
         import h5py
-        from keras.engine import topology
+        from keras.engine import saving
 
         if exclude:
             by_name = True
@@ -2116,9 +2116,9 @@ class MaskRCNN():
             layers = filter(lambda l: l.name not in exclude, layers)
 
         if by_name:
-            topology.load_weights_from_hdf5_group_by_name(f, layers)
+            saving.load_weights_from_hdf5_group_by_name(f, layers)
         else:
-            topology.load_weights_from_hdf5_group(f, layers)
+            saving.load_weights_from_hdf5_group(f, layers)
         if hasattr(f, 'close'):
             f.close()