src/nt_composition/config.py: add cpu variable

src/nt_composition/config.py

@@ -50,6 +50,7 @@ class ConfigNt:
     """
     A class containing every parameters used in the submodule nt_composition
     """
+    cpu = Config.cpu
     data = Config.data
     result = Config.results
     db_file = Config.db_file