[Ml] Validate tree feature index is within range #52515
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This changes the tree validation code to ensure no node in the tree has a feature index that is beyond the bounds of the feature_names array. Specifically this handles the situation where the C++ emits a tree containing a single node and an empty feature_names list. This is valid tree used to centre the data in the ensemble but the validation code would reject this as feature_names is empty. This meant a broken workflow as you cannot GET the model and PUT it back
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Pinging @elastic/ml-core (:ml) |
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This changes the tree validation code to ensure no node in the tree has a
feature index that is beyond the bounds of the feature_names array.
Specifically this handles the situation where the C++ emits a tree containing
a single node and an empty feature_names list. This is valid tree used to
centre the data in the ensemble but the validation code would reject this
as feature_names is empty. This meant a broken workflow as you cannot GET
the model and PUT it back
Backport of #52460