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Use Eigen::BlockSparseMatrix in Embedded Laplace approximation internals #3422

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Use Eigen::BlockSparseMatrix in Embedded Laplace approximation internals#3422
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@SteveBronder
SteveBronder
opened on Sep 28, 2026

Eigen 5+ has BlockSparseMatrix which we can use for the block diagonal matrix W_r in the internals for the Laplace marginal density estimator functions.

https://gitlab.com/libeigen/eigen/-/merge_requests/2644

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