[SYSTEMDS-3951] MM Chain Optimization w/ Basic Average Estimator#2525

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ywcb00 wants to merge 7 commits into

apache:mainfrom

ywcb00:fix/hops/rewrite/sparse

Commits on Jul 10, 2026

chore(main/hops/rewrite/RewriteMatrixMultChainOptimizationSparse.java): delete content of method to get the input matrices since it does not work and replace it with a not implemented exception for…
ywcb00
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feat(main/hops/estim/MMNode.java): add constructor to create a MMNode leaf with its metadata only
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fix(test/functions/rewrite/RewriteMatrixMultChainOptSparseTest.java): check if the mm chain was rewritten with respect to sparsity by checking for the respective keyword in the trace log
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fix(RewriteMatrixMultChainOptimizationSparse.java): replace the mnc estimator by the basic average estimator for matrix multiplication chain rewrites
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fix(test/functions/rewrite/RewriteMatrixMultChainOptSparseTest.java): capture and validate the log output to remove the necessity of having a console print in the code
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fix(test/functions/rewrite/RewriteMatrixMultChainOptSparseTest): add tighter checks for correct rewrites based on sparsity estimates
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refactor(main/hops/rewrite/RewriteMatrixMultChainOptimization.java): apply proper codestyle
ywcb00
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