feat(framework) Add SimpleBackend
for simulations
#3989
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A new backend based on pure mp
Processes
and that doesn't requireray
.Merge after #3988 .
Limitation: it would be better if we first redesign
ClientApp
so it's pickleable. Currently the wayClientApp
defines and uses ffn prevents it from being pickleable. The current solution is to use cloudpickle which relaxes the conditions that objects need to meet to be pickleable