Returns a mapper that computes the mean features of unique feature groups.
The feature groups are identified by the unique combination of all values of a set of provided feature attributes. Order of output features might differ from original and correspond to sorted order of corresponding attrs by default. Use order='occurrence' if you would like to maintain the order.
Parameters : | attrs : list
attrfx : ‘merge’ or callable, optional
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Returns : | FxMapper instance. : |