Remove additional warnning in layer.to (#36700)

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

Author: JiabinYang

python/paddle/fluid/dygraph/layers.py

@@ -1590,7 +1590,10 @@ def transform(t, device, dtype, blocking):
 
             return new_t
 
-        self._apply(transform, device, dtype, blocking)
+        with warnings.catch_warnings():
+            warnings.filterwarnings("ignore", category=UserWarning)
+            self._apply(transform, device, dtype, blocking)
+
         self._dtype = dtype
 
     # [aliases] Compatible with old method names