code: def test_format_kwarg_dictionaries_defaults_empty():
      empty = format_kwarg_dictionaries()
      assert isinstance(empty, dict)
      assert len(empty) == 0
  
imports: import os
  import sys
  import numpy
  from mlxtend.utils import assert_raises, check_Xy, format_kwarg_dictionaries
label_desc: Use image node_id 12 for calling a global function with example usage: test_format_kwarg_dictionaries_defaults_empty() without return types