Tree fits are now also accepted from from the partykit package
(constparty objects), instead of only from the rpart package.
Functions fusedTree and PenOpt now take a new optional input argument
symFusion. Setting this argument to FALSE allows for asymmetric fusion,
where omics effects in nodes having similar predictions of the response
(using only clinical variables) will be shrunken less toward each other compared
to omics effects in nodes having more distinct predictions.
For memory efficiency, Matrix algebra is now conduced using sparse matrices
from the Matrix package when X is high-dimensional.
Predict function does not require the test response by default anymore. Rather, it is an optional parameter.