Issues with running on Spyder 5.0.5

[lrcfmd]

Issues with running on Spyder 5.0.5

[sgbaird]

Python multiprocessing RuntimeError: An attempt has been made to start a new process before the current process has finished its bootstrapping phase

Multiprocessing usually doesn't work in a console/ide in Windows. When using a spawning system instead of fork, python must import modules and create state in the child process to get things to work. If you do not protect your outer script with a if name=="main": clause, you get this problem.

[sgbaird]

However, what's odd is the ElM2D does seem to have this:

ElM2D/ElM2D/ElM2D.py

Lines 510 to 511 in 7c82fdc

	if __name__ == "__main__":
	main()

Another related SE post:
https://stackoverflow.com/questions/18204782/runtimeerror-on-windows-trying-python-multiprocessing

Is it possible that the pip-installed version didn't include the if __name__ == "__main__": clause?

[sgbaird]

(Spyder maintainer here) Multiprocessing doesn't work well on Windows in Spyder's IPython console. However, you can run your code in an external terminal to have the results you want.

To do that, please go to

Run > Configuration per file > Execute in an external system terminal
https://stackoverflow.com/a/48099756/13697228

[sgbaird]

Also related: https://stackoverflow.com/a/52768747/13697228

I was able to get it working by making a "test" function as follows:

from multiprocessing import freeze_support
from os.path import join
import pandas as pd
from ElM2D import ElM2D

def main():
    mapper = ElM2D()
    datapath = join("train-debug.csv")
    df = pd.read_csv(datapath)
    mapper.fit(df["formula"])
    
if __name__ == '__main__':
    freeze_support()
    main()