Merge pull request #271 from theislab/fix/import

don't import external

Author: MUCDK

src/cellflow/__init__.py

@@ -1,4 +1,4 @@
 from importlib import metadata
 
 import cellflow.preprocessing as pp
-from cellflow import data, datasets, external, metrics, model, networks, solvers, training, utils
+from cellflow import data, datasets, metrics, model, networks, solvers, training, utils