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The Eigen overloads for model base methods like log_prob and unconstrain_array only accept Eigen::VectorXd inputs, which can require some data-reshaping/copying for downstream interfaces.
If these could be changed to Eigen::Ref<Eigen::VectorXd> (or overloads for these added), then the current Stan behaviour would be unchanged but interfaces could then pass Eigen::Map<Eigen::VectorXd> types and avoid extra copies
Summary:
The Eigen overloads for model base methods like
log_probandunconstrain_arrayonly acceptEigen::VectorXdinputs, which can require some data-reshaping/copying for downstream interfaces.If these could be changed to
Eigen::Ref<Eigen::VectorXd>(or overloads for these added), then the current Stan behaviour would be unchanged but interfaces could then passEigen::Map<Eigen::VectorXd>types and avoid extra copiesCurrent Version:
v2.35.0