[SYSTEMDS-3948] Row-wise Sparsity Estimator#2466

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ywcb00 wants to merge 6 commits intoapache:mainfrom

ywcb00:feat/sparsity/estim/rs

Commits on Apr 30, 2026

feat(EstimatorRowWise.java): implement the first version of the row wise sparsity estimator
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feat(test/estim): add some tests for the row wise sparsity estimator to the unity tests for sparsity estimation
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Commits on May 4, 2026

feat(hops/estim/EstimatorRowWise.java): introduce a separate object container for row wise sparsity vectors to simplify access and allow storing it with chain nodes
ywcb00
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Commits on May 5, 2026

fix(hops/estim/EstimatorRowWise.java): fix derivation of output data characteristics
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Commits on May 6, 2026