Breaking big initializer methods into manageable-size segments

[TPF2017]

When I run
java -Xms4g -Xmx4g -jar jpmml-transpiler-executable-1.1-SNAPSHOT.jar --pmml-input LambdaRank.pmml --jar-output LambdaRank.pmml.jar

I Got

java.io.IOException
at org.jpmml.codemodel.CompilerUtil.compile(CompilerUtil.java:89)
at org.jpmml.codemodel.CompilerUtil.compile(CompilerUtil.java:45)
at org.jpmml.transpiler.TranspilerUtil.compile(TranspilerUtil.java:75)
at org.jpmml.transpiler.Main.run(Main.java:116)
at org.jpmml.transpiler.Main.main(Main.java:99)

[vruusmann]

Please provide more information about the compilation error.

You should have a half-baked JAR file somewhere, which contains a problematic Java source code file. You can parse it yourself, or you can give it to me.

[TPF2017]

jar.zip
Do you mean this file?

[vruusmann]

Do you mean this file?

Yes!

You can extract the enclosed PMML$750029115.java Java source code file, and compile it using the command-line javac.exe tool in order to see the real compilation problem:

$ javac -cp pmml-evaluator-example-executable-1.6-SNAPSHOT.jar PMML\$750029115.java 

The error message is:

PMML$750029115.java:20257: error: code too large
        private static void initScores$892555958(DataInputStream dataInput)
                            ^
PMML$750029115.java:20266: error: code too large
        private static void initMethods$892555958() {
                            ^
2 errors

In short, JPMML-Transpiler is generating static initializer methods which exceed some JLS/JVM limits. The root cause is that your GBDT model contains too many child decision tree models.

You should try to limit n_estimators to 1000 for starters.

[vruusmann]

You can extract the enclosed PMML$750029115.java Java source code file, and compile it using the command-line javac.exe tool

FYI, you can satisfy all import requirements by adding the JPMML-Evaluator uber-JAR file to compiler classpath:
https://github.com/jpmml/jpmml-evaluator/releases

[TPF2017]

You can extract the enclosed PMML$750029115.java Java source code file, and compile it using the command-line javac.exe tool

FYI, you can satisfy all import requirements by adding the JPMML-Evaluator uber-JAR file to compiler classpath:
https://github.com/jpmml/jpmml-evaluator/releases

Thanks a lot !!