&yarnabrina [BUG] correct ForecastX
behaviour in case of multivariate y
#4719
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For multivariate
y
, the compositorForecastX
would always broadcast over variables ofy
, even if wrapped forecasters were multivariate.However,
ForecastX
itself should never broadcast overy
, that should be left to component forecasters.Fixed here, this also fixes #4718
Includes a slightly extended test case from the bug report #4718 by @yarnabrina