code: def test_Lambda(self) -> None:
      lam = transforms.Lambda(keys=["a", "b", "c"], fn=lambda x: x + 1)
      data = {"a": 1, "b": 2, "c": 3, "d": 4}
      out = lam(data)
      self.assertEqual(out, {"a": 2, "b": 3, "c": 4, "d": 4})
  
imports: import os
  import unittest
  from copy import deepcopy
  from typing import List
  from unittest.mock import Mock, patch
  import numpy
  import reagent.core.types
  import torch
  from reagent.preprocessing import transforms
  from reagent.preprocessing.types import InputColumn
label_desc: Use image node_id 11 for calling the TestTransforms obj's underlying member method code with example usage: obj.test_Lambda() without return types