mantichora broken on Windows with release 0.9.8? about mantichora

[TaiSakuma]

Thank you for checking. I will fix it when I can.

[TaiSakuma]

Thank you for letting me know.

I will see if I can revert the default to spawn on Windows.

Incidentally, in the latest version (0.10.0), you can choose to usespawn by the option mp_start_method as described in a section of README.md.

mantichora(mp_start_method='spawn')

However, this still might not work on Windows. I don't have access to a Windows machine and cannot try it at the moment.

[domengorjup]

I don't think that would work, since the error is thrown already when importing mantichora. Here is more information I hope you might find helpful:

(venv) λ python
Python 3.7.1 (default, Oct 23 2018, 22:56:47) [MSC v.1912 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import mantichora
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\test\venv\lib\site-packages\mantichora\__init__.py", line 2, in <module>
    from .main import mantichora
  File "C:\test\venv\lib\site-packages\mantichora\main.py", line 4, in <module>
    from .hubmp import MultiprocessingHub
  File "C:\test\venv\lib\site-packages\mantichora\hubmp.py", line 272, in <module>
    ctx_fork = multiprocessing.get_context('fork')
  File "c:\programdata\anaconda3\Lib\multiprocessing\context.py", line 238, in get_context
    return super().get_context(method)
  File "c:\programdata\anaconda3\Lib\multiprocessing\context.py", line 192, in get_context
    raise ValueError('cannot find context for %r' % method) from None
ValueError: cannot find context for 'fork'

The issue seems to be in the following line:

mantichora/mantichora/hubmp.py

Line 272 in c0b32d0

ctx_fork = multiprocessing.get_context('fork')

as this code fails on Windows.

This is for version 0.10.0 of mantichora.

[TaiSakuma]

This issue has been open for a while. I finally had a chance to work on it.
I released 0.12.0.
It works on Windows in GitHub Actions.