diff --git a/great_ai/src/great_ai/utilities/__init__.py b/great_ai/src/great_ai/utilities/__init__.py
index e69de29..1e9de78 100644
--- a/great_ai/src/great_ai/utilities/__init__.py
+++ b/great_ai/src/great_ai/utilities/__init__.py
@@ -0,0 +1,12 @@
+from .clean import clean
+from .evaluate_ranking import evaluate_ranking
+from .get_sentences import get_sentences
+from .language import english_name_of_language, is_english, predict_language
+from .lemmatize_text import lemmatize_text
+from .lemmatize_token import lemmatize_token
+from .match_names import match_names
+from .matcher import fast_tokenize, filter_sentences, normalize
+from .nlp import nlp
+from .parallel_map import parallel_map
+from .publication_tei import PublicationTEI
+from .unique import unique
diff --git a/great_ai/src/great_ai/utilities/parallel_map.py b/great_ai/src/great_ai/utilities/parallel_map.py
index b9aa438..108bdcc 100644
--- a/great_ai/src/great_ai/utilities/parallel_map.py
+++ b/great_ai/src/great_ai/utilities/parallel_map.py
@@ -14,9 +14,12 @@ def parallel_map(
     function: Callable[[Any], Any],
     values: Iterable[Any],
     chunk_size: Optional[int] = None,
-    concurrency: int = psutil.cpu_count(),
+    concurrency: Optional[int] = None,
     disable_progress: bool = False,
 ) -> List[Any]:
+    if concurrency is None:
+        concurrency = psutil.cpu_count()
+
     assert concurrency > 0
     assert chunk_size is None or chunk_size > 0