code: def df_multi():
      return DataFrame(
          data=np.arange(16).reshape(4, 4),
          columns=MultiIndex.from_product([["A", "B"], ["a", "b"]]),
          index=MultiIndex.from_product([["X", "Y"], ["x", "y"]]),
      )
  
imports: import numpy
  import pytest
  from pandas import NA, DataFrame, IndexSlice, MultiIndex, NaT, Timestamp, option_context
  from pandas.io.formats.style import Styler
  from pandas.io.formats.style_render import _str_escape
label_desc: Use image node_id 3 for calling a global function with example usage: df_multi() and returns: DataFrame