zmq.error.ZMQError: Address already in use when enable multiprocessing in notebook

[Zhiwei35]

Error

zmq.error.ZMQError: Address already in use

overview

I am benchmarking a DL model using multiprocessing python library. And it reported above error. when I disabled the multiprocessing or run without jupyter notebook, it works well

Reproduce steps

os: linux python reproduce.py --model_path=/path/to/froze_graph.pb
note that github does not support attach .py and .pb file, so I change its suffix to .log and .txt. When you are reproducing, please change its suffix. Thanks very much.
reproduce.log
frozen_graph.pb.txt

[JasonWeill]

Another multiprocessing bug here: #5951

[JasonWeill]

Another multiprocessing bug here: #5951