Remove v-pred warnings

Different model architectures, such as SDXL, can take advantage of
v-pred. It doesn't make sense to include these warnings anymore.

library/train_util.py

@@ -3698,10 +3698,6 @@ def verify_training_args(args: argparse.Namespace):
         global HIGH_VRAM
         HIGH_VRAM = True
 
-    if args.v_parameterization and not args.v2:
-        logger.warning(
-            "v_parameterization should be with v2 not v1 or sdxl / v1やsdxlでv_parameterizationを使用することは想定されていません"
-        )
     if args.v2 and args.clip_skip is not None:
         logger.warning("v2 with clip_skip will be unexpected / v2でclip_skipを使用することは想定されていません")