code: def powspec_feat(
      samples,
      sr=8000,
      nfft=512,
      winlen=0.025,
      winstep=0.01,
      lowfreq=0,
      highfreq=None,
      preemph=0.97,
  ):
      """return : [nframe, nfft / 2 + 1]"""
      feat = psf.powerspec(
          samples,
          nfft=nfft,
          samplerate=sr,
          winlen=winlen,
          winstep=winstep,
          lowfreq=lowfreq,
          highfreq=highfreq,
          preemph=preemph,
      )
      return feat
  
file_path: delta/delta/data/feat/speech_feature.py
imports: import os
  import numpy
  import delta.compat
  from absl import logging
  from delta.data.feat import speech_ops
  from core.ops import py_x_ops
  from delta.data.feat import python_speech_features
label_desc: Use image node_id 10 for calling a global function with example usage: powspec_feat(samples, sr, nfft, winlen, winstep, lowfreq, highfreq, preemph) and returns: feat