fix the bug that the pool for shuffle is too small.
fix the bug that the pool for shuffle is too small.

Superjom/models-1,qingqing01/models,kuke/models,lcy-seso/models,kuke/models,lcy-seso/models,kuke/models,PaddlePaddle/models,qingqing01/models,qingqing01/models,kuke/models,PaddlePaddle/models,Superjom/models-1,Superjom/models-1,PaddlePaddle/models,lcy-seso/models