spyk commented on a change in pull request #242:
URL: https://github.com/apache/solr/pull/242#discussion_r683387756
##########
File path:
solr/contrib/ltr/src/java/org/apache/solr/ltr/model/MultipleAdditiveTreesModel.java
##########
@@ -292,10 +291,10 @@ private static float scoreNode(float[] featureVector,
RegressionTreeNode regress
return 0f;
}
- if (featureVector[regressionTreeNode.featureIndex] <=
regressionTreeNode.threshold) {
- regressionTreeNode = regressionTreeNode.left;
- } else {
+ if (featureVector[regressionTreeNode.featureIndex] >=
regressionTreeNode.threshold) {
Review comment:
We run into case with a specific XGBoost model where a variable might
take on 0 or 1 and the split condition being `1.0`. So, in that case if we go
left by default the right path is never evaluated, which results in silently
decreased model performance.
But, agree it's a rather big change, there might be issues with a) other
tree models that split to the left b) backwards incompatibility, so @cpoerschke
suggestion makes a lot of sense.
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