diff --git a/README.md b/README.md
index 8570a7f..1d206ed 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,8 @@ Java library and command-line application for converting [R](https://www.r-proje
* `cv.glmnet` - Cross-validated GLMNet regression and calculation
* [`IsolationForest`](https://r-forge.r-project.org/R/?group_id=479) package:
* `iForest` - Isolation Forest (IF) anomaly detection
+ * [`lightgbm`](https://cran.r-project.org/package=lightgbm) package:
+ * `lgb.Booster` - LightGBM regression and classification.
* [`mlr`](https://cran.r-project.org/package=mlr) package:
* `WrappedModel` - Selected JPMML-R model types.
* [`neuralnet`](https://cran.r-project.org/package=neuralnet) package:
diff --git a/pmml-rexp-example/pom.xml b/pmml-rexp-example/pom.xml
index 9c44dc9..921c901 100644
--- a/pmml-rexp-example/pom.xml
+++ b/pmml-rexp-example/pom.xml
@@ -28,6 +28,10 @@
org.jpmml
pmml-rexp
+
+ org.jpmml
+ pmml-rexp-lightgbm
+
org.jpmml
pmml-rexp-xgboost
diff --git a/pmml-rexp-lightgbm/pom.xml b/pmml-rexp-lightgbm/pom.xml
new file mode 100644
index 0000000..8a0b3d8
--- /dev/null
+++ b/pmml-rexp-lightgbm/pom.xml
@@ -0,0 +1,48 @@
+
+
+ 4.0.0
+
+
+ org.jpmml
+ jpmml-r
+ 1.6-SNAPSHOT
+
+
+ org.jpmml
+ pmml-rexp-lightgbm
+ jar
+
+ JPMML R LightGBM converter
+ JPMML R LightGBM to PMML converter
+
+
+
+ GNU Affero General Public License (AGPL) version 3.0
+ http://www.gnu.org/licenses/agpl-3.0.html
+ repo
+
+
+
+
+
+ org.jpmml
+ pmml-rexp
+
+
+
+ org.jpmml
+ pmml-evaluator-testing
+ provided
+
+
+
+ org.jpmml
+ pmml-lightgbm
+
+
+
+ junit
+ junit
+
+
+
diff --git a/pmml-rexp-lightgbm/src/main/java/org/jpmml/rexp/lightgbm/LightGBMConverter.java b/pmml-rexp-lightgbm/src/main/java/org/jpmml/rexp/lightgbm/LightGBMConverter.java
new file mode 100644
index 0000000..a52411b
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/main/java/org/jpmml/rexp/lightgbm/LightGBMConverter.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2024 Villu Ruusmann
+ *
+ * This file is part of JPMML-R
+ *
+ * JPMML-R is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * JPMML-R is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with JPMML-R. If not, see .
+ */
+package org.jpmml.rexp.lightgbm;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collections;
+
+import org.dmg.pmml.PMML;
+import org.jpmml.lightgbm.GBDT;
+import org.jpmml.lightgbm.LightGBMUtil;
+import org.jpmml.rexp.Converter;
+import org.jpmml.rexp.REnvironment;
+import org.jpmml.rexp.RExpEncoder;
+import org.jpmml.rexp.RRaw;
+
+public class LightGBMConverter extends Converter {
+
+ public LightGBMConverter(REnvironment environment){
+ super(environment);
+ }
+
+ @Override
+ public PMML encodePMML(RExpEncoder encoder){
+ REnvironment environment = getObject();
+
+ RRaw raw = (RRaw)environment.findVariable("raw");
+ if(raw == null){
+ throw new IllegalArgumentException();
+ }
+
+ GBDT gbdt;
+
+ try(InputStream is = new ByteArrayInputStream(raw.getValue())){
+ gbdt = LightGBMUtil.loadGBDT(is);
+ } catch(IOException ioe){
+ throw new IllegalArgumentException(ioe);
+ }
+
+ return gbdt.encodePMML(Collections.emptyMap(), null, null);
+ }
+}
\ No newline at end of file
diff --git a/pmml-rexp-lightgbm/src/main/resources/META-INF/r2pmml.properties b/pmml-rexp-lightgbm/src/main/resources/META-INF/r2pmml.properties
new file mode 100644
index 0000000..ee90292
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/main/resources/META-INF/r2pmml.properties
@@ -0,0 +1 @@
+lgb.Booster = org.jpmml.rexp.lightgbm.LightGBMConverter
\ No newline at end of file
diff --git a/pmml-rexp-lightgbm/src/test/R/lightgbm.R b/pmml-rexp-lightgbm/src/test/R/lightgbm.R
new file mode 100644
index 0000000..d34198e
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/R/lightgbm.R
@@ -0,0 +1,51 @@
+library("lightgbm")
+
+source("util.R")
+
+auto = loadAutoCsv("Auto")
+
+auto_X = auto[, -ncol(auto)]
+auto_y = auto[, ncol(auto)]
+
+auto.matrix = as.matrix(auto_X)
+
+auto.dset = lgb.Dataset(auto.matrix, label = auto_y)
+
+generateLightGBMAuto = function(){
+ auto.lgbm = lgb.train(params = list(objective = "regression"), data = auto.dset, nrounds = 31)
+
+ mpg = predict(auto.lgbm, auto.matrix)
+
+ storeRds(auto.lgbm, "LightGBMAuto")
+ storeCsv(data.frame("_target" = mpg), "LightGBMAuto")
+}
+
+set.seed(42)
+
+generateLightGBMAuto()
+
+iris = loadIrisCsv("Iris")
+
+iris_X = iris[, -ncol(iris)]
+iris_y = iris[, ncol(iris)]
+
+# Convert from factor to integer[0, num_class]
+iris_y = (as.integer(iris_y) - 1)
+
+iris.matrix = as.matrix(iris_X)
+
+iris.dset = lgb.Dataset(iris.matrix, label = iris_y)
+
+generateLightGBMIris = function(){
+ iris.lgbm = lgb.train(params = list(objective = "multiclass", num_class = 3, max_depth = 3), data = iris.dset, nrounds = 5)
+
+ probabilities = predict(iris.lgbm, iris.matrix)
+ species = max.col(probabilities) - 1
+
+ storeRds(iris.lgbm, "LightGBMIris")
+ storeCsv(data.frame("_target" = species, "probability(0)" = probabilities[, 1], "probability(1)" = probabilities[, 2], "probability(2)" = probabilities[, 3], check.names = FALSE), "LightGBMIris")
+}
+
+set.seed(42)
+
+generateLightGBMIris()
diff --git a/pmml-rexp-lightgbm/src/test/R/util.R b/pmml-rexp-lightgbm/src/test/R/util.R
new file mode 100644
index 0000000..599ff82
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/R/util.R
@@ -0,0 +1 @@
+source("../../../../pmml-rexp/src/test/R/util.R")
\ No newline at end of file
diff --git a/pmml-rexp-lightgbm/src/test/java/org/jpmml/rexp/lightgbm/testing/LightGBMConverterTest.java b/pmml-rexp-lightgbm/src/test/java/org/jpmml/rexp/lightgbm/testing/LightGBMConverterTest.java
new file mode 100644
index 0000000..0c5e6b2
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/java/org/jpmml/rexp/lightgbm/testing/LightGBMConverterTest.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2024 Villu Ruusmann
+ *
+ * This file is part of JPMML-R
+ *
+ * JPMML-R is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * JPMML-R is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with JPMML-R. If not, see .
+ */
+package org.jpmml.rexp.lightgbm.testing;
+
+import org.jpmml.converter.testing.Datasets;
+import org.jpmml.rexp.testing.RExpEncoderBatchTest;
+import org.junit.Test;
+
+public class LightGBMConverterTest extends RExpEncoderBatchTest implements Datasets {
+
+ public LightGBMConverterTest(){
+ super();
+ }
+
+ @Test
+ public void evaluateAuto() throws Exception {
+ evaluate("LightGBM", AUTO);
+ }
+
+ @Test
+ public void evaluateIris() throws Exception {
+ evaluate("LightGBM", IRIS);
+ }
+}
\ No newline at end of file
diff --git a/pmml-rexp-lightgbm/src/test/resources/csv/Auto.csv b/pmml-rexp-lightgbm/src/test/resources/csv/Auto.csv
new file mode 100644
index 0000000..92ec293
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/resources/csv/Auto.csv
@@ -0,0 +1,393 @@
+cylinders,displacement,horsepower,weight,acceleration,model_year,origin,mpg
+8,307,130,3504,12,70,1,18
+8,350,165,3693,11.5,70,1,15
+8,318,150,3436,11,70,1,18
+8,304,150,3433,12,70,1,16
+8,302,140,3449,10.5,70,1,17
+8,429,198,4341,10,70,1,15
+8,454,220,4354,9,70,1,14
+8,440,215,4312,8.5,70,1,14
+8,455,225,4425,10,70,1,14
+8,390,190,3850,8.5,70,1,15
+8,383,170,3563,10,70,1,15
+8,340,160,3609,8,70,1,14
+8,400,150,3761,9.5,70,1,15
+8,455,225,3086,10,70,1,14
+4,113,95,2372,15,70,3,24
+6,198,95,2833,15.5,70,1,22
+6,199,97,2774,15.5,70,1,18
+6,200,85,2587,16,70,1,21
+4,97,88,2130,14.5,70,3,27
+4,97,46,1835,20.5,70,2,26
+4,110,87,2672,17.5,70,2,25
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+4,104,95,2375,17.5,70,2,25
+4,121,113,2234,12.5,70,2,26
+6,199,90,2648,15,70,1,21
+8,360,215,4615,14,70,1,10
+8,307,200,4376,15,70,1,10
+8,318,210,4382,13.5,70,1,11
+8,304,193,4732,18.5,70,1,9
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+4,113,95,2228,14,71,3,25
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+4,140,72,2408,19,71,1,22
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+4,91,70,1955,20.5,71,1,26
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diff --git a/pmml-rexp-lightgbm/src/test/resources/csv/Iris.csv b/pmml-rexp-lightgbm/src/test/resources/csv/Iris.csv
new file mode 100644
index 0000000..8b63930
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/resources/csv/Iris.csv
@@ -0,0 +1,151 @@
+Sepal.Length,Sepal.Width,Petal.Length,Petal.Width,Species
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diff --git a/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMAuto.csv b/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMAuto.csv
new file mode 100644
index 0000000..921e185
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMAuto.csv
@@ -0,0 +1,393 @@
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diff --git a/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMIris.csv b/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMIris.csv
new file mode 100644
index 0000000..acec8a6
--- /dev/null
+++ b/pmml-rexp-lightgbm/src/test/resources/csv/LightGBMIris.csv
@@ -0,0 +1,151 @@
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diff --git a/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMAuto.rds b/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMAuto.rds
new file mode 100644
index 0000000..73455f9
Binary files /dev/null and b/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMAuto.rds differ
diff --git a/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMIris.rds b/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMIris.rds
new file mode 100644
index 0000000..46f63d5
Binary files /dev/null and b/pmml-rexp-lightgbm/src/test/resources/rds/LightGBMIris.rds differ
diff --git a/pmml-rexp/src/main/java/org/jpmml/rexp/ConverterFactory.java b/pmml-rexp/src/main/java/org/jpmml/rexp/ConverterFactory.java
index 99c3e15..1582885 100644
--- a/pmml-rexp/src/main/java/org/jpmml/rexp/ConverterFactory.java
+++ b/pmml-rexp/src/main/java/org/jpmml/rexp/ConverterFactory.java
@@ -53,7 +53,13 @@ public Converter newConverter(R rexp){
public Converter newConverter(Class> clazz, R rexp){
try {
- Constructor constructor = clazz.getDeclaredConstructor(rexp.getClass());
+ Class rexpClazz = rexp.getClass();
+
+ while(rexpClazz.isAnonymousClass()){
+ rexpClazz = (Class)rexpClazz.getSuperclass();
+ }
+
+ Constructor constructor = clazz.getDeclaredConstructor(rexpClazz);
return (Converter)constructor.newInstance(rexp);
} catch(Exception e){
diff --git a/pom.xml b/pom.xml
index 60fa281..00b9ef6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,6 +35,7 @@
pmml-rexp
pmml-rexp-example
+ pmml-rexp-lightgbm
pmml-rexp-xgboost
@@ -65,6 +66,11 @@
pmml-rexp-example
1.6-SNAPSHOT
+
+ org.jpmml
+ pmml-rexp-lightgbm
+ 1.6-SNAPSHOT
+
org.jpmml
pmml-rexp-xgboost
@@ -88,6 +94,12 @@
1.6.5
+
+ org.jpmml
+ pmml-lightgbm
+ 1.5.4
+
+
org.jpmml
pmml-xgboost