[Misc] Throw error on unintended access to scheduler_config.max_model_len (#29771)

frank-wei · web-flow · commit fc95521ba59f · 2025-12-02T10:58:44.000+08:00
Signed-off-by: Wei Wei &lt;wwei6@meta.com&gt;
diff --git a/vllm/config/scheduler.py b/vllm/config/scheduler.py
@@ -274,3 +274,8 @@ def verify_max_model_len(self, max_model_len: int) -> Self:
             )
 
         return self
+
+    def __getattribute__(self, name: str) -> Any:
+        if name == "max_model_len" or name == "is_encoder_decoder":
+            raise AttributeError(f"{name} is an init-only parameter. ")
+        return object.__getattribute__(self, name)

Original file line number	Diff line number	Diff line change
`@@ -274,3 +274,8 @@ def verify_max_model_len(self, max_model_len: int) -> Self:`
`274`	`274`	`)`
`275`	`275`
`276`	`276`	`return self`
	`277`	`+`
	`278`	`+ def __getattribute__(self, name: str) -> Any:`
	`279`	`+ if name == "max_model_len" or name == "is_encoder_decoder":`
	`280`	`+ raise AttributeError(f"{name} is an init-only parameter. ")`
	`281`	`+ return object.__getattribute__(self, name)`