optimize the efficiency of beam search
optimize the efficiency of beam search

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