`ray` not in requirements.txt

[cossatot]

I'm working from a fresh install using latest master. When using run_calc from a script I get this error:

File ~/src/gem/oq-engine/openquake/baselib/parallel.py:671, in Starmap.init(cls, distribute)
    670 try:
--> 671     from ray.util.multiprocessing import Pool
    672     cls.pool = Pool(cls.num_cores, init_workers)

ModuleNotFoundError: No module named 'ray'

Obviously an easy fix on my machine with pip install ray but perhaps this should be in the requirements?

[micheles]

No, this is not right, ray is not officially supported, you should never go there. What are you doing exactly?