--- a
+++ b/survival4D/paths.py
@@ -0,0 +1,6 @@
+from pathlib import Path
+
+ROOT_DIR = Path(__file__).parent.parent
+DATA_DIR = ROOT_DIR.joinpath("data")
+DEMO_DIR = ROOT_DIR.joinpath("demo")
+LIB_DIR = ROOT_DIR.joinpath("survival4D")