code: def test_convert_old_distribution_to_new_distribution_noop() -> None:
      # No conversion happens for CategoricalDistribution.
      cd = distributions.CategoricalDistribution(
          choices=["a", "b", "c"]
      )
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              cd
          )
          == cd
      )
  
      # No conversion happens for new distributions.
      fd = distributions.FloatDistribution(
          low=0, high=10, log=False, step=None
      )
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              fd
          )
          == fd
      )
  
      dfd = distributions.FloatDistribution(
          low=0, high=10, log=False, step=2
      )
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              dfd
          )
          == dfd
      )
  
      lfd = distributions.FloatDistribution(
          low=1, high=10, log=True, step=None
      )
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              lfd
          )
          == lfd
      )
  
      id = distributions.IntDistribution(low=0, high=10)
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              id
          )
          == id
      )
  
      idd = distributions.IntDistribution(low=0, high=10, step=2)
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              idd
          )
          == idd
      )
  
      ild = distributions.IntDistribution(low=1, high=10, log=True)
      assert (
          distributions._convert_old_distribution_to_new_distribution(
              ild
          )
          == ild
      )
  
imports: import copy
  import json
  from typing import Any
  from typing import cast
  from typing import Dict
  from typing import Optional
  import warnings
  import numpy
  import pytest
  from optuna import distributions
label_desc: Use image node_id 27 for calling a global function with example usage: test_convert_old_distribution_to_new_distribution_noop() without return types