docstr: Takes paths to audio files and returns a list of paths to processed
  audios.
  
  Args:
      paths2audio_files: paths to audio files to be processed
      output_dir: directory to save processed files
      batch_size: batch size for inference
  
  Returns:
      Paths to processed audio signals.
docstr_tok: ["Takes","paths","to","audio","files","and","returns","a","list","of","paths","to","processed","audios",".","Args",":","paths2audio_files",":","paths","to","audio","files","to","be","processed","output_dir",":","directory","to","save","processed","files","batch_size",":","batch","size","for","inference","Returns",":","Paths","to","processed","audio","signals","."]
code: def process(
      self,
      paths2audio_files: List[str],
      output_dir: str,
      batch_size: int = 4,
  ) -> List[Union[str, List[str]]]:
      """
      Takes paths to audio files and returns a list of paths to processed
      audios.
  
      Args:
          paths2audio_files: paths to audio files to be processed
          output_dir: directory to save processed files
          batch_size: batch size for inference
  
      Returns:
          Paths to processed audio signals.
      """
      pass
  
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 13 for calling the AudioToAudioModel obj's underlying member method code with example usage: obj.process(paths2audio_files, output_dir, batch_size) without return types