fix recompute state (#7044)

* fix recompute state

ppdet/modeling/backbones/vision_transformer.py

@@ -352,7 +352,8 @@ class VisionTransformer(nn.Layer):
         self.final_norm = final_norm
 
         if use_checkpoint:
-            print('please set: FLAGS_allocator_strategy=naive_best_fit')
+            paddle.seed(0)
+
         self.patch_embed = PatchEmbed(
             img_size=img_size,
             patch_size=patch_size,