Update augment in validator (#3943)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/engine/validator.py

@@ -95,6 +95,7 @@ class BaseValidator:
         if trainer is passed (trainer gets priority).
         """
         self.training = trainer is not None
+        augment = self.args.augment and (not self.training)
         if self.training:
             self.device = trainer.device
             self.data = trainer.data
@@ -159,7 +160,7 @@ class BaseValidator:
 
             # Inference
             with dt[1]:
-                preds = model(batch['img'], augment=self.args.augment)
+                preds = model(batch['img'], augment=augment)
 
             # Loss
             with dt[2]: