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* add interaction constraints * enable both interaction and monotonic constraints at the same time * fix lint * add R test, fix lint, update demo * Use dmlc::JSONReader to express interaction constraints as nested lists; Use sparse arrays for bookkeeping * Add Python test for interaction constraints * make R interaction constraints parameter based on feature index instead of column names, fix R coding style * Fix lint * Add BlueTea88 to CONTRIBUTORS.md * Short circuit when no constraint is specified; address review comments * Add tutorial for feature interaction constraints * allow interaction constraints to be passed as string, remove redundant column_names argument * Fix typo * Address review comments * Add comments to Python test
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