你如何在 Java 中解开一个 python 对象

Question

I am trying unpickle an xgboost model within Java to load it. Is there any way to do this. It's difficult for me to run purely in python.

I've been thinking of programmatically writing and executing a python script but is there a cleaner way? Solutions like Jython are outdated because I am using Python 3.8.

Answer 1

See the awesome Pickle library.

The usage is very simple:

Object pyObject;
try(InputStream is = new FileInputStream("dump.pkl")){
  net.razorvine.pickle.Unpickler unpickler = new net.razorvine.pickle.Unpickler();
  pyObject = unpickler.load(is);
}

If the pickle file contains a Python object, then the loaded pyObject is a Java map that contains key-value attribute mappings.