Increase NCCL timeout from 1 hour to 3 hours (#3343)

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>

ultralytics/yolo/engine/trainer.py

@@ -197,8 +197,9 @@ class BaseTrainer:
         self.device = torch.device('cuda', RANK)
         LOGGER.info(f'DDP info: RANK {RANK}, WORLD_SIZE {world_size}, DEVICE {self.device}')
         os.environ['NCCL_BLOCKING_WAIT'] = '1'  # set to enforce timeout
-        dist.init_process_group('nccl' if dist.is_nccl_available() else 'gloo',
-                                timeout=timedelta(seconds=3600),
+        dist.init_process_group(
+            'nccl' if dist.is_nccl_available() else 'gloo',
+            timeout=timedelta(seconds=10800),  # 3 hours
             rank=RANK,
             world_size=world_size)