class_docstr: kws task 
docstr: generate feature
docstr_tok: ["generate","feature"]
code: def generate_feat(self, paths):
      """generate feature"""
  
file_path: delta/delta/data/task/kws_cls_task.py
imports: import struct
  import numpy
  import delta.compat
  from delta import utils
  from delta.utils.register import registers
  from delta.data.task.base_speech_task import SpeechTask
  from delta.data.utils.htk_reader_lib import HtkReaderIO
label_desc: Use image node_id 2 for calling the KwsClsTask obj's underlying member method code with example usage: obj.generate_feat(paths) without return types