fix SimpleStatistic -> CallbackStatistic
fix SimpleStatistic -> CallbackStatistic

alexfrolov/grappa,buaasun/grappa,uwsampa/grappa,uwsampa/grappa,uwsampa/grappa,buaasun/grappa,uwsampa/grappa,alexfrolov/grappa,buaasun/grappa,alexfrolov/grappa,alexfrolov/grappa,alexfrolov/grappa,alexfrolov/grappa,alexfrolov/grappa,uwsampa/grappa,buaasun/grappa,buaasun/grappa,uwsampa/grappa,buaasun/grappa,uwsampa/grappa,buaasun/grappa