From 5c24dc5c9642a8d9ed70aee4c950fd0678a1ebec Mon Sep 17 00:00:00 2001
From: Jon Bratseth <bratseth@gmail.com>
Date: Thu, 19 May 2022 12:03:06 +0200
Subject: Rename the 'searchdefinition' package to 'schema'

---
 .../LightGBMFeatureConverter.java                  | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 config-model/src/main/java/com/yahoo/schema/expressiontransforms/LightGBMFeatureConverter.java

(limited to 'config-model/src/main/java/com/yahoo/schema/expressiontransforms/LightGBMFeatureConverter.java')

diff --git a/config-model/src/main/java/com/yahoo/schema/expressiontransforms/LightGBMFeatureConverter.java b/config-model/src/main/java/com/yahoo/schema/expressiontransforms/LightGBMFeatureConverter.java
new file mode 100644
index 00000000000..af5fa5ebeab
--- /dev/null
+++ b/config-model/src/main/java/com/yahoo/schema/expressiontransforms/LightGBMFeatureConverter.java
@@ -0,0 +1,59 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.schema.expressiontransforms;
+
+import com.yahoo.path.Path;
+import com.yahoo.searchlib.rankingexpression.rule.Arguments;
+import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
+import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
+import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
+import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
+import com.yahoo.vespa.model.ml.ConvertedModel;
+import com.yahoo.vespa.model.ml.FeatureArguments;
+
+import java.io.UncheckedIOException;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Replaces instances of the lightgbm(model-path) pseudofeature with the
+ * native Vespa ranking expression implementing the same computation.
+ *
+ * @author lesters
+ */
+public class LightGBMFeatureConverter extends ExpressionTransformer<RankProfileTransformContext> {
+
+    /** A cache of imported models indexed by model path. This avoids importing the same model multiple times. */
+    private final Map<Path, ConvertedModel> convertedLightGBMModels = new HashMap<>();
+
+    @Override
+    public ExpressionNode transform(ExpressionNode node, RankProfileTransformContext context) {
+        if (node instanceof ReferenceNode)
+            return transformFeature((ReferenceNode) node, context);
+        else if (node instanceof CompositeNode)
+            return super.transformChildren((CompositeNode) node, context);
+        else
+            return node;
+    }
+
+    private ExpressionNode transformFeature(ReferenceNode feature, RankProfileTransformContext context) {
+        if ( ! feature.getName().equals("lightgbm")) return feature;
+
+        try {
+            FeatureArguments arguments = asFeatureArguments(feature.getArguments());
+            ConvertedModel convertedModel =
+                    convertedLightGBMModels.computeIfAbsent(arguments.path(),
+                                                           path -> ConvertedModel.fromSourceOrStore(path, true, context));
+            return convertedModel.expression(arguments, context);
+        } catch (IllegalArgumentException | UncheckedIOException e) {
+            throw new IllegalArgumentException("Could not use LightGBM model from " + feature, e);
+        }
+    }
+
+    private FeatureArguments asFeatureArguments(Arguments arguments) {
+        if (arguments.size() != 1)
+            throw new IllegalArgumentException("A lightgbm node must take a single argument pointing to " +
+                                               "the LightGBM model file under [application]/models");
+        return new FeatureArguments(arguments);
+    }
+
+}
-- 
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