class_docstr: read the kaldi ark format file
class_docstr_tok: ["read","the","kaldi","ark","format","file"]
code: def __init__(self):
      self._fp = None
      self._open_file_name = ""
  
      self._delta_normalizer = 0
      self._delta_window = 1
  
      self._calutlate_mean_variance_start = True
      self._meam_variance_list = []
      self._mean_variance_statu = False
      self._mean_array = None
      self._variance_array = None
  
file_path: delta/delta/data/utils/htk_reader_lib.py
imports: import os
  import math
  import numpy
label_desc: Use image node_id 1 to create a new HtkReaderIO object  with example: obj = HtkReaderIO()