code: def setup_test_data(self, cfg):
      pass
  
imports: import itertools
  from math import ceil
  from pathlib import Path
  from typing import List, Tuple
  import torch
  import torch.nn.functional
  from einops import rearrange
  from hydra.utils import instantiate
  from omegaconf import DictConfig, OmegaConf, open_dict
  from pytorch_lightning import Trainer
  from nemo.collections.tts.losses.audio_codec_loss import MultiResolutionMelLoss, MultiResolutionSTFTLoss, RelativeFeatureMatchingLoss, SISDRLoss, TimeDomainLoss
  from nemo.collections.tts.modules.common import GaussianDropout
  from nemo.collections.tts.parts.utils.callbacks import LoggingCallback
  from nemo.collections.tts.parts.utils.helpers import get_batch_size, get_num_workers
  from nemo.core import ModelPT
  from nemo.core.classes.common import PretrainedModelInfo, typecheck
  from nemo.core.neural_types.elements import AudioSignal, EncodedRepresentation, LengthsType, TokenIndex
  from nemo.core.neural_types.neural_type import NeuralType
  from nemo.core.optim.lr_scheduler import compute_max_steps, prepare_lr_scheduler
  from nemo.utils import logging, model_utils
  from nemo.utils.decorators import experimental
label_desc: Use image node_id 21 for calling the AudioCodecModel obj's underlying member method code with example usage: obj.setup_test_data(cfg) without return types