fix notebook to properly load data again

notebooks/1.0-hfk-datamodules-exploration.ipynb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:cb54303b39da6232abd0c39c72d4133d38f26cf103c39ec5a2fc4f100e475c9a
-size 4381
+oid sha256:f10076bb7e344f57863514c74c5eebf9b81d3c606fac7670e9d26e5dd91df1b9
+size 17942