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[使用问题] paddlecloud分布式训练demo报错

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**问题概述**：参照distributed_train.md教程提交paddlecloud训练任务。demo和配置同教程所述，配置采用`K8S集群的Collective模式配置`。任务运行没有输出，日志有报错。 **任务详情** 安装paddle-rec（run.log显示安装成功） ``` # before_hook.sh pip install paddle-rec==1.8.5.1 pip uninstall -y paddlepaddle python -m pip install paddlepaddle-gpu==1.8.5.post107 -i https://mirror.baidu.com/pypi/simple ``` 报错信息(workerlog) ``` # /env_run/logs/workerlog.0 ... /opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/sklearn/externals/joblib/externals/cloudpickle/cloudpickle.py:47: Deprec ationWarning: the ...