class_docstr: Given flist, apply random speed perturbation
class_docstr_tok: ["Given","flist",",","apply","random","speed","perturbation"]
code: def __len__(self):
      return len(self.flist)
  
imports: import os
  import platform
  import sys
  from concurrent.futures import ProcessPoolExecutor
  from typing import List, Tuple
  from unittest import skipIf
  import numpy
  import torch
  import torchaudio
  from torchaudio_unittest.common_utils import get_whitenoise, PytorchTestCase, save_wav, skipIfNoSox, TempDirMixin
label_desc: Use image node_id 3 for calling the RandomPerturbationFile obj's underlying member method code with example usage: obj.__len__() and returns: len