cpoerschke commented on a change in pull request #58:
URL: https://github.com/apache/solr/pull/58#discussion_r629289913
##########
File path:
solr/contrib/ltr/src/java/org/apache/solr/ltr/model/MultipleAdditiveTreesModel.java
##########
@@ -345,6 +281,80 @@ public float score(float[] modelFeatureValuesNormalized) {
return score;
}
+ private static float scoreNode(float[] featureVector, RegressionTreeNode
regressionTreeNode) {
+ while (true) {
+ if (regressionTreeNode.isLeaf()) {
+ return regressionTreeNode.value;
+ }
+ // unsupported feature (tree is looking for a feature that does not
exist)
+ if ((regressionTreeNode.featureIndex < 0) ||
(regressionTreeNode.featureIndex >= featureVector.length)) {
+ return 0f;
+ }
+
+ if (featureVector[regressionTreeNode.featureIndex] <=
regressionTreeNode.threshold) {
+ regressionTreeNode = regressionTreeNode.left;
+ } else {
+ regressionTreeNode = regressionTreeNode.right;
+ }
+ }
+ }
+
+ private static void validateNode(RegressionTreeNode regressionTreeNode)
throws ModelException {
+ while (true) {
+ if (regressionTreeNode.isLeaf()) {
+ if (regressionTreeNode.left != null || regressionTreeNode.right !=
null) {
+ throw new ModelException("MultipleAdditiveTreesModel tree node is
leaf with left=" + regressionTreeNode.left + " and right=" +
regressionTreeNode.right);
+ }
+ return;
+ }
+ if (null == regressionTreeNode.threshold) {
+ throw new ModelException("MultipleAdditiveTreesModel tree node is
missing threshold");
+ }
+ if (null == regressionTreeNode.left) {
+ throw new ModelException("MultipleAdditiveTreesModel tree node is
missing left");
+ } else {
+ regressionTreeNode = regressionTreeNode.left;
+ }
+ if (null == regressionTreeNode.right) {
+ throw new ModelException("MultipleAdditiveTreesModel tree node is
missing right");
+ } else {
+ regressionTreeNode = regressionTreeNode.right;
+ }
Review comment:
```suggestion
if (null == regressionTreeNode.left) {
throw new ModelException("MultipleAdditiveTreesModel tree node is
missing left");
} else {
regressionTreeNode = regressionTreeNode.left;
continue;
}
if (null == regressionTreeNode.right) {
throw new ModelException("MultipleAdditiveTreesModel tree node is
missing right");
} else {
regressionTreeNode = regressionTreeNode.right;
continue;
}
```
I think a `continue` is needed after the `regressionTreeNode =
regressionTreeNode.left` and whilst it's not necessary currently after the
`regressionTreeNode = regressionTreeNode.right` it might be nicely symmetrical
to have it there too e.g. in case additional validation is added in future
after the `regressionTreeNode = regressionTreeNode.right` assignment.
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