[ENH] fix Empirical
index to be pd.MultiIndex
for hierarchical data index
#6341
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The
Empirical
distribution would producepd.Index
of tuples instead ofpd.MultiIndex
in some methods, causing failures in #6052.This PR fixes that.
In light of the current refactor in
skpro
which will see theEmpirical
reworked, I think it is sufficient to test indirectly via #6052 for onw.