How can I call scikit-learn classifiers from Java?

Question

I have a classifier that I trained using Python\'s scikit-learn. How can I use the classifier from a Java program? Can I use Jython? Is there some way to save the classifier

Answer 1

There is JPMML project for this purpose.

First, you can serialize scikit-learn model to PMML (which is XML internally) using sklearn2pmml library directly from python or dump it in python first and convert using jpmml-sklearn in java or from a command line provided by this library. Next, you can load pmml file, deserialize and execute loaded model using jpmml-evaluator in your Java code.

This way works with not all scikit-learn models, but with many of them.