code: def compute_head(self, x: Tensor):
      pi, sigma, mu = self.head(x)
      return {
          "pi": pi,
          "sigma": sigma,
          "mu": mu,
          "backbone_features": x,
      }
  
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 9 for calling the MDNModel obj's underlying member method code with example usage: obj.compute_head(x) and returns: dict