code: def __init__(self, cfg: DictConfig, trainer: Trainer = None):
      super().__init__(cfg=cfg, trainer=trainer)
  
      self._setup_loss()
  
imports: from abc import ABC, abstractmethod
  from typing import List, Union
  import hydra
  import torch
  from omegaconf import DictConfig, OmegaConf
  from pytorch_lightning import Trainer
  from nemo.collections.asr.metrics.audio import AudioMetricWrapper
  from nemo.core.classes import ModelPT
  from nemo.utils import logging, model_utils
label_desc: Use image node_id 1 to create a new AudioToAudioModel object from inherited base classes: ModelPT, ABC with example: obj = AudioToAudioModel(cfg, trainer)