code: def test_data_frame_value_counts_empty_normalize():
      df_no_cols = pd.DataFrame()
  
      result = df_no_cols.value_counts(normalize=True)
      expected = pd.Series(
          [],
          dtype=np.float64,
          name="proportion",
          index=np.array([], dtype=np.intp),
      )
  
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/frame/methods/test_value_counts.py
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 7 for calling a global function with example usage: test_data_frame_value_counts_empty_normalize() without return types