Fix wrong weight reference in dynamic EPLB (#6818)

python/sglang/srt/utils.py

@@ -2257,3 +2257,16 @@ except:
 
 def cpu_has_amx_support():
     return torch._C._cpu._is_amx_tile_supported() and is_intel_amx_backend_available
+
+
+class LazyValue:
+    def __init__(self, creator: Callable):
+        self._creator = creator
+        self._value = None
+
+    @property
+    def value(self):
+        if self._creator is not None:
+            self._value = self._creator()
+            self._creator = None
+        return self._value