class_docstr: Apply speaker embedding extraction on hidden layer outputs. 
code: def __init__(self, config):
      super().__init__(config)
  
file_path: delta/delta/utils/postprocess/speaker_cls_proc.py
imports: import os
  import collections
  import numpy
  from absl import logging
  from kaldiio import WriteHelper
  from delta.utils.postprocess.base_postproc import PostProc
  from delta.utils.register import registers
label_desc: Use image node_id 1 to create a new SpkUttPostProc object from inherited base classes: SpeakerPostProc with example: obj = SpkUttPostProc(config)