class_docstr: Class for encoder-mask-decoder audio processing models.
  
  The model consists of the following blocks:
      - encoder: transforms input multi-channel audio signal into an encoded representation (analysis transform)
      - mask_estimator: estimates a mask used by signal processor
      - mask_processor: mask-based signal processor, combines the encoded input and the estimated mask
      - decoder: transforms processor output into the time domain (synthesis transform)
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docstr: This method returns a list of pre-trained model which can be instantiated directly from NVIDIA's NGC cloud.
  
  Returns:
      List of available pre-trained models.
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code: def list_available_models(cls) -> Optional[PretrainedModelInfo]:
      """
      This method returns a list of pre-trained model which can be instantiated directly from NVIDIA's NGC cloud.
  
      Returns:
          List of available pre-trained models.
      """
      results = []
  
      return results
  
imports: import json
  import os
  import tempfile
  from typing import Dict, List, Optional, Union
  import librosa
  import soundfile
  import torch
  from omegaconf import DictConfig
  from pytorch_lightning import Trainer
  from tqdm import tqdm
  from nemo.collections.asr.data import audio_to_audio_dataset
  from nemo.collections.asr.data.audio_to_text_dataset import inject_dataloader_value_from_model_config
  from nemo.collections.asr.models.audio_to_audio_model import AudioToAudioModel
  from nemo.collections.asr.parts.utils.audio_utils import ChannelSelectorType
  from nemo.core.classes.common import PretrainedModelInfo, typecheck
  from nemo.core.neural_types import AudioSignal, LengthsType, NeuralType
  from nemo.utils import logging
label_desc: Use image node_id 14 for calling the EncMaskDecAudioToAudioModel obj's underlying member method code with example usage: obj.list_available_models(cls) and returns: results