code: def _mt_fft(x):
      return fft.fft(x, workers=2)
  
file_path: catboost/contrib/python/scipy/py3/scipy/fft/tests/test_multithreading.py
imports: from scipy import fft
  import numpy
  import pytest
  from numpy.testing import assert_allclose
  import multiprocessing
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: _mt_fft(x) and returns: fft