se-resnext多机同步下，有trainer在多个pass下后，loss值突增
Created by: ccmeteorljh
paddle version：0.15 模型：se-resnext paddlecloud job: http://paddlecloud.baidu-int.com:8088/paddle/jobRunInfo?jobId=job-e6c5b7d5391e215f&flag=jobs&groupName=k8s_gpu_demo&groupId=c0a1f165-6279-5320-b9e7-e0218c7a87f5¤tPage=1¤tKey=1