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when i changed ExpandingMean, RollingMean from mlforecast with windows_ops options, it worked. not sure whether i made a mistake on how i implemented the nixtla version: i used just ExpendingMean (with no parameters) and then RollingMean(window_size=n)

Did you set ExpandingMean or ExpandingMean()? I think we just check if it's a callable and if you don't initialize the object it will go through the function path

ok, thx. i will check next week