MATLAB: Using deploytool to create Java package

Question

Hello!

My intention is to use a Random Forest Ensemble, trained previously in Matlab, in a Java application. My Matlab function, which I compiled, using deploytool is:

   function [Probability]=PredictingTest (Predictor)
     load (['D:/Test/Tree.mat'], 'Tree')
     [~, prob]=predict(Tree , Predictor);
     Probability=prob(:,1);
   end

Where:

• Predictor input is an integer between -10 to 10.
• Probability output is a double between 0 to 1.
• Tree is a .mat file with a CompactTreeBagger object stored in it.

Next I deploy the jar files to my Eclipse project, and try to run this Java code:

/* Necessary package imports */
import com.mathworks.toolbox.javabuilder.*;
import PredictTest.*;
public class predict_test {
  
   static MWNumericArray rhs = null;   /* Stores input value */
   static PredictTest prediction;
   static Object[] result = null;    /* Stores the result */
  
   public static void main(String[] args) {
  
  try {
       prediction = new PredictTest();
       rhs=new MWNumericArray(5,MWClassID.DOUBLE);      
       result=prediction.PredictingTest(1, rhs);
       }
      catch (MWException e) {
      e.printStackTrace();
  }}}

Sadly what I get is this exception:

{Warning: Variable 'Tree' originally saved as a CompactTreeBagger cannot be instantiated as an object and will be read in as a uint32.}

> In PredictingTest at 3

{??? Undefined function or method 'predict' for input arguments of type 'uint32'.

So, as far as I understood, this means that Java can't use Matlab objects even by the methods, compiled from Matlab functions. It will be very nice if I could get some help on how can I overcome this. It is very important to me. Thank you all in advance!

P.S I'm surely not confined to a Matlab TreeBagger algorithm. If there is a Java package you are familiar with, that can do the work, it can be a nice solution too.

Answer 1

Hi,

try to add the CompactTreeBagger class definition to your project. Then you should be able to handle objects of this class within your project ...

Titus