code: def get_feature(f):
      fs, signal = wavfile.read(f)
      signal = signal.astype("float64")
      feat = get_bob_extractor(fs, n_filters=26, n_ceps=13)(signal)
      feat = diff_feature(feat, nd=2)
      return feat
  
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 5 for calling a global function with example usage: get_feature(f) and returns: feat