code: def _get_input_config(self):
      model_config = self._get_model_config()
      return {
          "batch_size": 7,
          "in_channels": model_config["in_channels"],
          "time_length": 10,
      }
  
imports: import math
  import torch
  from parameterized import parameterized
  from torchaudio.prototype.models import hifigan_vocoder, hifigan_vocoder_v1, hifigan_vocoder_v2, hifigan_vocoder_v3
  from torchaudio.prototype.pipelines import HIFIGAN_VOCODER_V3_LJSPEECH
  from torchaudio_unittest.common_utils import TestBaseMixin, torch_script
  from .original.env import AttrDict
  from .original.meldataset import mel_spectrogram
  from .original.models import Generator
label_desc: Use image node_id 2 for calling the HiFiGANTestImpl obj's underlying member method code with example usage: obj._get_input_config() and returns: dict