Merge pull request #562 from aai-institute/fix/561-future-warning

Make default argument for config None and instantiate in init

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+### Fixed
+
+- `FutureWarning` for `ParallelConfig` constantly raised without actually 
+  instantiating the object
+  [PR #562](https://github.com/aai-institute/pyDVL/pull/562)
+
 ## 0.9.0 - 🆕 New methods, better docs and bugfixes 📚🐞
 
 ### Added

src/pydvl/parallel/futures/__init__.py

@@ -21,7 +21,7 @@
 )
 def init_executor(
     max_workers: Optional[int] = None,
-    config: ParallelConfig = ParallelConfig(),
+    config: Optional[ParallelConfig] = None,
     **kwargs,
 ) -> Generator[Executor, None, None]:
     """Initializes a futures executor for the given parallel configuration.
@@ -50,6 +50,10 @@ def init_executor(
         assert results == [1, 2, 3, 4, 5]
         ```
     """
+
+    if config is None:
+        config = ParallelConfig()
+
     try:
         cls = ParallelBackend.BACKENDS[config.backend]
         with cls.executor(max_workers=max_workers, config=config, **kwargs) as e: