现在copy这个策略的话只是一条直线，请问需要做什么改动呢？多谢
log里有如下的warning：
2010-01-01 00:00:00 - WARNING - /opt/conda/lib/python3.6/site-packages/joblib/_multiprocessing_helpers.py:38: UserWarning: [Errno 30] Read-only file system. joblib will operate in serial mode
warnings.warn('%s. joblib will operate in serial mode' % (e,))
雪球
