changed x.numpy to x.item in mix_transformer (#3891)

Author: GoldenStain

paddleseg/models/backbones/mix_transformer.py

@@ -305,7 +305,7 @@ def __init__(self,
 
         # transformer encoder
         dpr = [
-            x.numpy() for x in paddle.linspace(0, drop_path_rate, sum(depths))
+            x.item() for x in paddle.linspace(0, drop_path_rate, sum(depths))
         ]  # stochastic depth decay rule
         cur = 0
         self.block1 = nn.LayerList([