code: def ae_model(self):
      return VQVAE(VQVAEConfig(input_dim=(1, 28, 28), latent_dim=4))
  
imports: import os
  from copy import deepcopy
  import pytest
  import torch
  from pydantic import ValidationError
  from pythae.customexception import BadInheritanceError
  from pythae.models import VQVAE, AutoModel, VQVAEConfig
  from pythae.models.base.base_utils import ModelOutput
  from pythae.models.vq_vae.vq_vae_utils import Quantizer, QuantizerEMA
  from pythae.pipelines import GenerationPipeline, TrainingPipeline
  from pythae.samplers import PixelCNNSamplerConfig
  from pythae.trainers import BaseTrainer, BaseTrainerConfig
  from tests.data.custom_architectures import Decoder_AE_Conv, Encoder_AE_Conv, NetBadInheritance
label_desc: Use image node_id 2 for calling the Test_VQVAE_Generation obj's underlying member method code with example usage: obj.ae_model() and returns: VQVAE