[SYSTEMDS-3166] Refactor Isolation Forest builtin and add edge-case tests#2498
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PeilinChen01 wants to merge 4 commits into
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[SYSTEMDS-3166] Refactor Isolation Forest builtin and add edge-case tests#2498PeilinChen01 wants to merge 4 commits into
PeilinChen01 wants to merge 4 commits into
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This patch promotes the existing Isolation Forest algorithm implementation from the staging phase to builtin status, with improvements. The implementation provides two main builtins, outlierByIsolationForest for training iForest models and outlierByIsolationForestApply for scoring samples based on trained models. Specifically, we optimized the algorithm with vectorized harmonic number computation for improved scalability. The patch extends test coverage in `staging/isolationForestTest.dml` with comprehensive tests, and Python API integration tests. Refer to JIRA for detailed discussions. Related to apache#1980 Co-authored-by: keremaras1 <60196502+keremaras1@users.noreply.github.com> Co-authored-by: denizzqq <denizdolanmaz@rocketmail.com>
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July 24, 2026 07:05
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Summary
This pull request contains the current LDE progress for SYSTEMDS-3166 and builds on the original Isolation Forest implementation in #2421.
Main changes:
Tests
The following command passes locally:
mvn -Dtest=BuiltinIsolationForestTest testCovered test cases include: