code: def test_serve(backbone):
      train_data = {
          "num_col": [1.4, 2.5],
          "cat_col": ["positive", "negative"],
          "target": [1, 2],
      }
      datamodule = TabularClassificationData.from_data_frame(
          "cat_col",
          "num_col",
          "target",
          train_data_frame=pd.DataFrame.from_dict(train_data),
          batch_size=1,
      )
      model = TabularClassifier.from_data(
          datamodule=datamodule, backbone=backbone
      )
      model.eval()
      model.serve(parameters=datamodule.parameters)
  
imports: from typing import Any
  from unittest.mock import patch
  import flash
  import pandas
  import pytest
  import torch
  from flash.core.data.io.input import DataKeys
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE, _TOPIC_TABULAR_AVAILABLE
  from flash.tabular.classification.data import TabularClassificationData
  from flash.tabular.classification.model import TabularClassifier
  from torch import Tensor
  from tests.helpers.task_tester import StaticDataset, TaskTester
label_desc: Use image node_id 1 for calling a global function with example usage: test_serve(backbone) without return types