PEP660 support for pip install -e . (#9851)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/data/base.py

@@ -122,9 +122,7 @@ class BaseDataset(Dataset):
         except Exception as e:
             raise FileNotFoundError(f"{self.prefix}Error loading data from {img_path}\n{HELP_URL}") from e
         if self.fraction < 1:
-            # im_files = im_files[: round(len(im_files) * self.fraction)]
-            num_elements_to_select = round(len(im_files) * self.fraction)
-            im_files = random.sample(im_files, num_elements_to_select)
+            im_files = im_files[: round(len(im_files) * self.fraction)]  # retain a fraction of the dataset
         return im_files
 
     def update_labels(self, include_class: Optional[list]):

ultralytics/data/dataset.py

@@ -1,4 +1,5 @@
 # Ultralytics YOLO 🚀, AGPL-3.0 license
+
 import contextlib
 import json
 from collections import defaultdict