[Config Refactor] sentinel default precedence (#3078)

Signed-off-by: lishunyang <lishunyang12@163.com>
Signed-off-by: xiaohajiayou <923390377@qq.com>
Co-authored-by: lishunyang <lishunyang12@163.com>

examples/offline_inference/vace/vace_video_generation.py

@@ -71,6 +71,9 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--ulysses-degree", type=int, default=1, help="Ulysses SP degree.")
     parser.add_argument("--ring-degree", type=int, default=1, help="Ring attention degree.")
     parser.add_argument("--cfg-parallel-size", type=int, default=1, choices=[1, 2], help="CFG parallel size.")
+    from vllm_omni.engine.arg_utils import nullify_stage_engine_defaults
+
+    nullify_stage_engine_defaults(parser)
     return parser.parse_args()