code: def __init__(self, config):
      self.config = config
      self.collate_fn_test = SpeechCollator.from_config(config)
      self._text_featurizer = TextFeaturizer(
          unit_type=config.collator.unit_type, vocab_filepath=None
      )
  
file_path: PaddleHub/modules/audio/asr/deepspeech2_librispeech/deepspeech_tester.py
imports: import os
  import sys
  from pathlib import Path
  import paddle
  from deepspeech.frontend.featurizer.text_featurizer import TextFeaturizer
  from deepspeech.io.collator import SpeechCollator
  from deepspeech.models.ds2 import DeepSpeech2Model
  from deepspeech.utils import mp_tools
  from deepspeech.utils.utility import UpdateConfig
label_desc: Use image node_id 1 to create a new DeepSpeech2Tester object  with example: obj = DeepSpeech2Tester(config)