The backend computation is not working

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I have the same python2 environment configured and dependencies are the same as inside docker, but when I run the frontend and backend separately, the computation of analytical and simulated pronbability both fail. Should I config the port of frontend and backend port differently or they can listen to the same port but different url? Looking forward for answers. Thanks.

[850075610]

Btw, even I run the docker way, the computation didn't work, either.