fix bert temporary (#3014)

PaddleNLP/dialogue_model_toolkit/dialogue_general_understanding/.run_ce.sh

@@ -50,6 +50,11 @@ train_mrda(){
   --enable_ce
 }
 
+# FIXME(zjl): this model would fail when GC is enabled,
+# but it seems that this error is from the model itself.
+# See issue here: https://github.com/PaddlePaddle/Paddle/issues/18994#event-2532039900       
+# To fix ce, disable gc in this model temporarily.  
+export FLAGS_eager_delete_tensor_gb=-1
 
 cudaid=${multi:=0,1,2,3}
 export CUDA_VISIBLE_DEVICES=$cudaid