code: def m2s(pf):
      if ".wav" not in pf[2]:
          return
      mwav = os.path.join(pf[0], pf[2])
      maudio, sr = torchaudio.load(mwav)
      swav = os.path.join(pf[1], pf[2])
      saudio = maudio[0:1]
      torchaudio.save(swav, saudio, sr)
      return
  
imports: import os
  import sys
  from multiprocessing import Pool
  from pathlib import Path
  import torchaudio
  import tqdm
label_desc: Use image node_id 1 for calling a global function with example usage: m2s(pf) without return types