[Bug Fix] fix paddle multipy_fwd_func warning message (#7818)

Author: BeingGod

paddlenlp/transformers/llama/modeling.py

@@ -366,10 +366,12 @@ def forward(self, hidden_states):
 
         if paddle.in_dynamic_mode():
             with paddle.amp.auto_cast(False):
-                variance = hidden_states.astype("float32").pow(2).mean(-1, keepdim=True)
+                hidden_states = hidden_states.astype("float32")
+                variance = hidden_states.pow(2).mean(-1, keepdim=True)
                 hidden_states = paddle.rsqrt(variance + self.variance_epsilon) * hidden_states
         else:
-            variance = hidden_states.astype("float32").pow(2).mean(-1, keepdim=True)
+            hidden_states = hidden_states.astype("float32")
+            variance = hidden_states.pow(2).mean(-1, keepdim=True)
             hidden_states = paddle.rsqrt(variance + self.variance_epsilon) * hidden_states
 
         if self.weight.dtype in [paddle.float16, paddle.bfloat16]: