code: def __len__(self):
      return len(self.filelists)
  
imports: import argparse
  import numpy
  import os
  import string
  import bob.ap
  import scipy.io.wavfile
  from tensorpack.dataflow import DataFlow, LMDBSerializer
  from tensorpack.utils import fs, logger, serialize, get_tqdm
  from tensorpack.utils.argtools import memoized
  from tensorpack.utils.stats import OnlineMoments
label_desc: Use image node_id 2 for calling the RawTIMIT obj's underlying member method code with example usage: obj.__len__() and returns: len