Spyros Kapnissis created SOLR-15569:
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Summary: MultipleAdditiveTreesModel does not split as expected
when the node value equals the split threshold
Key: SOLR-15569
URL: https://issues.apache.org/jira/browse/SOLR-15569
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: contrib - LTR
Affects Versions: 8.9, main (9.0)
Reporter: Spyros Kapnissis
As discussed on the mailing list:
[https://lists.apache.org/thread.html/r23e10a021445e7bcf26ce578320304bd77165bc0c2136621f7a6225e%40%3Cusers.solr.apache.org%3E]
, MultipleAdditiveTreesModel does not split as expected when the value of the
tree node is equal to the threshold, but splits to the left instead of the
right. This can cause the final score of the model to change significantly.
This issue affects especially categorical or boolean features that take on
integer values. eg. if a feature can take on 0 or 1 and the left/right split is
set to 1.0, the right path will never be evaluated.
I will try to follow up with a test model that showcases the issue.
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