diff --git a/src/twomartens/masterthesis/ssd.py b/src/twomartens/masterthesis/ssd.py
index 6cd00ee..7e4fd04 100644
--- a/src/twomartens/masterthesis/ssd.py
+++ b/src/twomartens/masterthesis/ssd.py
@@ -217,7 +217,7 @@ def _predict_one_epoch(dataset: tf.data.Dataset,
         from pympler import muppy, summary
         all_objects = muppy.get_objects()
         all_lists = muppy.filter(all_objects, Type=list)
-        muppy.summary.print_(all_objects)
+        summary.print_(summary.summarize(all_lists))
         if lists is None:
             lists = map(id, all_lists)
         list_nr = 0