class_docstr: ASR Task 
class_docstr_tok: ["ASR","Task"]
code: def generate_cmvn(self, paths):
      pass
  
imports: import numpy
  import delta.compat
  from absl import logging
  from delta import utils
  from delta.data.utils import espnet_utils
  from delta.utils.register import registers
  from delta.data.task.base_speech_task import SpeechTask
label_desc: Use image node_id 7 for calling the AsrSeqTask obj's underlying member method code with example usage: obj.generate_cmvn(paths) without return types