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Memoize the optimal contraction sequence for each (vertex, edge) pair during message updates, avoiding redundant calls to optimaltree which accounted for ~50% of boundary MPS time. The cache is stored on the BeliefPropagationCache and BoundaryMPSCache structs and is invalidated via invalidate_contraction_sequences! when tensor dimensions change. Also fixes a bug in sampling where stale cached sequences caused incorrect density matrix contractions after state projection. Version bump to 0.3.3. Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Cache contraction sequences to boost performance.