code: def check_audio(audio_file):
      sig, sample_rate = sf.read(audio_file)
      assert (
          sample_rate == 16000
      ), "Excepting sample rate of input audio is 16000, but got {}".format(
          sample_rate
      )
  
file_path: PaddleHub/modules/audio/asr/u2_conformer_aishell/module.py
imports: import os
  from pathlib import Path
  import sys
  import numpy
  from paddlehub.env import MODULE_HOME
  from paddlehub.module.module import moduleinfo, serving
  from paddlehub.utils.log import logger
  import paddle
  import soundfile
  from deepspeech.exps.u2.config import get_cfg_defaults
  from deepspeech.utils.utility import UpdateConfig
  from .u2_conformer_tester import U2ConformerTester
label_desc: Use image node_id 2 for calling the U2Conformer obj's underlying member method code with example usage: obj.check_audio(audio_file) without return types