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Use sparse masks for derivative free leaf optimization #14

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@Clifford-appliedAI-GmbH Clifford-appliedAI-GmbH commented Mar 28, 2023

The current code here crashes due to no logsumexp for sparse matrices. A dense version of this with a hand-rolled logsumexp? works, but is 5x slower than the current implementation and could suffer from floating point inaccuracies.

See #13 for more details.

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