diff --git a/src/HGQ/bops/bops.py b/src/HGQ/bops/bops.py
index b83172d..a681cb3 100644
--- a/src/HGQ/bops/bops.py
+++ b/src/HGQ/bops/bops.py
@@ -12,17 +12,29 @@ def __init__(self):
 
     def on_epoch_end(self, epoch, logs=None):
         assert self.model is not None
+        logs['bops'] = self._bops(self.model)  # type: ignore
+
+    def _bops(self, model):
         bops = 0
-        for layer in self.model.layers:
+        for layer in model.layers:
             if hasattr(layer, 'bops'):
                 bops += layer.bops.numpy()
-        logs['bops'] = bops  # type: ignore
+                continue
+            if isinstance(layer, keras.Model):
+                bops += self._bops(layer)
+        return bops
 
 
 class ResetMinMax(tf.keras.callbacks.Callback):
     def on_epoch_end(self, epoch, logs=None):
         assert self.model is not None
-        for layer in self.model.layers:
+        self.reset_minmax(self.model)
+
+    @staticmethod
+    def reset_minmax(model):
+        for layer in model.layers:
+            if isinstance(layer, keras.Model):
+                ResetMinMax.reset_minmax(layer)
             if isinstance(layer, HLayerBase):
                 layer.reset_minmax()