code: def test_to_numpy_dataset_empty():
      pd_df = pd.DataFrame()
  
      np_df = to_numpy_dataset(pd_df, backend=LOCAL_BACKEND)
  
      assert np_df == {}
  
file_path: ludwig/tests/ludwig/utils/test_dataframe_utils.py
imports: import numpy
  import pandas
  import pytest
  from ludwig.backend import create_backend, LOCAL_BACKEND
  from ludwig.utils.dataframe_utils import to_numpy_dataset, to_scalar_df
label_desc: Use image node_id 5 for calling a global function with example usage: test_to_numpy_dataset_empty() without return types