Multiprocessing with libf0.swipe

[akustiker]

For some experiments, I used libf0.swipe in a multiprocessing pipeline to compute pitch estimates for multiple audio files in parallel.

I noticed that libf0.swipe consumes all CPU power on our Linux server. This is due to some NumPy functions that perform multiprocessing for calculations.

To regulate NumPy, I did something like this in my user code:

import os

# Set the number of threads for OpenMP
os.environ['OMP_NUM_THREADS'] = '1'

# Set the number of threads for MKL
os.environ['MKL_NUM_THREADS'] = '1'

# Optionally, set the number of threads for NumExpr if you're using it
os.environ['NUMEXPR_NUM_THREADS'] = '1'

# Your NumPy code goes here
import numpy as np

I'm not sure if this should be part of the library or mentioned in the README.md?