Chapter 5: undying error when I run multiprocess code in Jupyter about deepreinforcementlearninginaction HOT 2 OPEN

Had the same issue, this is because multiprocessing does not work natively inside a Jupyter notebook. For details see this StackOverflow discussion (specifically Eden Trainor's answer):
https://stackoverflow.com/questions/48846085/python-multiprocessing-within-jupyter-notebook

Apparently someone has created a similar library to multiprocessing called multiprocess which works inside jupyter notebooks. However, I suggest the authors (@azai91) either put a !pip install multiprocess in the notebook for this, or add a comment saying to run it from an IDE like Spyder. Since the multiprocess library has its own problems (had to re-import numpy inside the process) probably would go for the latter option.

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thanks for the link you provide
solved my question

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