[pre-commit.ci] pre-commit suggestions (#7279)

* [pre-commit.ci] pre-commit suggestions

updates:
- [github.com/asottile/pyupgrade: v2.31.0 → v2.31.1](https://github.com/asottile/pyupgrade/compare/v2.31.0...v2.31.1)
- [github.com/pre-commit/mirrors-yapf: v0.31.0 → v0.32.0](https://github.com/pre-commit/mirrors-yapf/compare/v0.31.0...v0.32.0)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update yolo.py

* Update activations.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update activations.py

* Update tf.py

* Update tf.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

utils/datasets.py

@@ -145,6 +145,7 @@ class InfiniteDataLoader(dataloader.DataLoader):
 
     Uses same syntax as vanilla DataLoader
     """
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         object.__setattr__(self, 'batch_sampler', _RepeatSampler(self.batch_sampler))
@@ -164,6 +165,7 @@ class _RepeatSampler:
     Args:
         sampler (Sampler)
     """
+
     def __init__(self, sampler):
         self.sampler = sampler
 
@@ -978,6 +980,7 @@ def dataset_stats(path='coco128.yaml', autodownload=False, verbose=False, profil
         autodownload:   Attempt to download dataset if not found locally
         verbose:        Print stats dictionary
     """
+
     def round_labels(labels):
         # Update labels to integer class and 6 decimal place floats
         return [[int(c), *(round(x, 4) for x in points)] for c, *points in labels]