code: def test_feature_names(test_sample) -> None:
      enc = OrdinalEncoder().fit(test_sample)
      assert enc.feature_names_in_ == ["cat", "num"]
  
file_path: cuml/python/cuml/tests/test_ordinal_encoder.py
imports: import cupy
  import numpy
  import pandas
  import pytest
  from sklearn.preprocessing import OrdinalEncoder
  from cuml.internals.safe_imports import gpu_only_import_from
  from cuml.preprocessing import OrdinalEncoder
label_desc: Use image node_id 6 for calling a global function with example usage: test_feature_names(test_sample) without return types