Release 8.0.4 fixes (#256)

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>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>
Co-authored-by: TechieG <35962141+gokulnath30@users.noreply.github.com>
Co-authored-by: Parthiban Marimuthu <66585214+partheee@users.noreply.github.com>

ultralytics/yolo/v8/classify/train.py

@@ -143,6 +143,7 @@ def train(cfg):
     cfg.weight_decay = 5e-5
     cfg.label_smoothing = 0.1
     cfg.warmup_epochs = 0.0
+    cfg.device = cfg.device if cfg.device is not None else ''
     # trainer = ClassificationTrainer(cfg)
     # trainer.train()
     from ultralytics import YOLO