Update Validator to use `model` argument (#4480)

ultralytics/cfg/__init__.py

@@ -82,7 +82,7 @@ def cfg2dict(cfg):
     Convert a configuration object to a dictionary, whether it is a file path, a string, or a SimpleNamespace object.
 
     Args:
-        cfg (str | Path | SimpleNamespace): Configuration object to be converted to a dictionary.
+        cfg (str | Path | dict | SimpleNamespace): Configuration object to be converted to a dictionary.
 
     Returns:
         cfg (dict): Configuration object in dictionary format.
@@ -110,6 +110,7 @@ def get_cfg(cfg: Union[str, Path, Dict, SimpleNamespace] = DEFAULT_CFG_DICT, ove
     # Merge overrides
     if overrides:
         overrides = cfg2dict(overrides)
+        overrides.pop('save_dir', None)  # special override keys to ignore
         check_dict_alignment(cfg, overrides)
         cfg = {**cfg, **overrides}  # merge cfg and overrides dicts (prefer overrides)
 

ultralytics/engine/validator.py

@@ -29,7 +29,7 @@ from tqdm import tqdm
 from ultralytics.cfg import get_cfg
 from ultralytics.data.utils import check_cls_dataset, check_det_dataset
 from ultralytics.nn.autobackend import AutoBackend
-from ultralytics.utils import DEFAULT_CFG, LOGGER, RANK, SETTINGS, TQDM_BAR_FORMAT, callbacks, colorstr, emojis
+from ultralytics.utils import LOGGER, RANK, SETTINGS, TQDM_BAR_FORMAT, callbacks, colorstr, emojis
 from ultralytics.utils.checks import check_imgsz
 from ultralytics.utils.files import increment_path
 from ultralytics.utils.ops import Profile
@@ -43,9 +43,9 @@ class BaseValidator:
     A base class for creating validators.
 
     Attributes:
+        args (SimpleNamespace): Configuration for the validator.
         dataloader (DataLoader): Dataloader to use for validation.
         pbar (tqdm): Progress bar to update during validation.
-        args (SimpleNamespace): Configuration for the validator.
         model (nn.Module): Model to validate.
         data (dict): Data dictionary.
         device (torch.device): Device to use for validation.
@@ -76,9 +76,9 @@ class BaseValidator:
             args (SimpleNamespace): Configuration for the validator.
             _callbacks (dict): Dictionary to store various callback functions.
         """
+        self.args = get_cfg(overrides=args)
         self.dataloader = dataloader
         self.pbar = pbar
-        self.args = args or get_cfg(DEFAULT_CFG)
         self.model = None
         self.data = None
         self.device = None
@@ -126,8 +126,7 @@ class BaseValidator:
         else:
             callbacks.add_integration_callbacks(self)
             self.run_callbacks('on_val_start')
-            assert model is not None, 'Either trainer or model is needed for validation'
-            model = AutoBackend(model,
+            model = AutoBackend(model or self.args.model,
                                 device=select_device(self.args.device, self.args.batch),
                                 dnn=self.args.dnn,
                                 data=self.args.data,

ultralytics/models/rtdetr/val.py

@@ -14,7 +14,7 @@ from ultralytics.utils import colorstr, ops
 __all__ = 'RTDETRValidator',  # tuple or list
 
 
-# TODO: Temporarily, RT-DETR does not need padding.
+# TODO: Temporarily RT-DETR does not need padding.
 class RTDETRDataset(YOLODataset):
 
     def __init__(self, *args, data=None, **kwargs):
@@ -47,7 +47,7 @@ class RTDETRDataset(YOLODataset):
         return self.ims[i], self.im_hw0[i], self.im_hw[i]
 
     def build_transforms(self, hyp=None):
-        """Temporarily, only for evaluation."""
+        """Temporary, only for evaluation."""
         if self.augment:
             hyp.mosaic = hyp.mosaic if self.augment and not self.rect else 0.0
             hyp.mixup = hyp.mixup if self.augment and not self.rect else 0.0
@@ -76,12 +76,13 @@ class RTDETRValidator(DetectionValidator):
 
         args = dict(model='rtdetr-l.pt', data='coco8.yaml')
         validator = RTDETRValidator(args=args)
-        validator(model=args['model'])
+        validator()
         ```
     """
 
     def build_dataset(self, img_path, mode='val', batch=None):
-        """Build YOLO Dataset
+        """
+        Build an RTDETR Dataset.
 
         Args:
             img_path (str): Path to the folder containing images.

ultralytics/models/yolo/classify/val.py

@@ -22,7 +22,7 @@ class ClassificationValidator(BaseValidator):
 
         args = dict(model='yolov8n-cls.pt', data='imagenet10')
         validator = ClassificationValidator(args=args)
-        validator(model=args['model'])
+        validator()
         ```
     """
 

ultralytics/models/yolo/detect/val.py

@@ -25,7 +25,7 @@ class DetectionValidator(BaseValidator):
 
         args = dict(model='yolov8n.pt', data='coco8.yaml')
         validator = DetectionValidator(args=args)
-        validator(model=args['model'])
+        validator()
         ```
     """
 

ultralytics/models/yolo/pose/val.py

@@ -22,7 +22,7 @@ class PoseValidator(DetectionValidator):
 
         args = dict(model='yolov8n-pose.pt', data='coco8-pose.yaml')
         validator = PoseValidator(args=args)
-        validator(model=args['model'])
+        validator()
         ```
     """
 

ultralytics/models/yolo/segment/val.py

@@ -24,7 +24,7 @@ class SegmentationValidator(DetectionValidator):
 
         args = dict(model='yolov8n-seg.pt', data='coco8-seg.yaml')
         validator = SegmentationValidator(args=args)
-        validator(model=args['model'])
+        validator()
         ```
     """