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https://issues.apache.org/jira/browse/SOLR-16596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682117#comment-17682117
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ASF subversion and git services commented on SOLR-16596:
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Commit 8477a83da9250e9d3dcb8d37ab43a615fc16f47c in solr's branch
refs/heads/main from aruggero
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=8477a83da92 ]
SOLR-16596: Introduce support for null feature values in LTR
MultipleAdditiveTreeModel (#1257)
> LTR MultipleAdditiveTreeModel do not support missing features' value
> --------------------------------------------------------------------
>
> Key: SOLR-16596
> URL: https://issues.apache.org/jira/browse/SOLR-16596
> Project: Solr
> Issue Type: Improvement
> Reporter: Anna
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The current MultipleAdditiveTree model doesn't support missing features'
> values.
> When a feature value is not passed, the model directly translates it to zero.
> Other LTR model libraries, like xgboost, are able to differentiate missing
> values from other values and also from zero values. They learn how to treat
> missing values at training time and add an additional "missing" branch to the
> tree with the direction learned to be the best in that situation.
> It would be nice to integrate this feature also in Solr MultipleAdditiveTree
> models. An additional "missing" parameter should be added to the
> RegressionTreeNode. This will determine the direction to take in case the
> feature value is missing.
> This integration will allow us to differentiate between zero and missing
> features.
> For example, if the feature is "hotel_avg_review" (with a ranking between
> zero and five stars), we would like to behave differently if the hotel has no
> reviews (we do not know if it is good) or if it has a review of zero stars
> (the hotel is bad).
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