code: def on_validation_batch_end(
      self, outputs, batch, batch_idx: int
  ) -> None:
      self._val_output.append(outputs)
      super().on_validation_batch_end(outputs, batch, batch_idx)
  
imports: from typing import Dict, Optional, Union
  import torch
  import torch.nn
  from omegaconf import DictConfig, OmegaConf
  from torch import Tensor
  from pytorch_tabular import models
  from pytorch_tabular.config.config import ModelConfig
  from pytorch_tabular.models.common.heads import blocks
  from pytorch_tabular.models.tab_transformer.tab_transformer import TabTransformerBackbone
  from pytorch_tabular.tabular_model import getattr_nested
  from pytorch_tabular.utils import get_logger
  from ..base_model import BaseModel, safe_merge_config
label_desc: Use image node_id 16 for calling the MDNModel obj's underlying member method code with example usage: obj.on_validation_batch_end(outputs, batch, batch_idx) without return types