Re: [Jboost-users] java.lang.RuntimeException in generation of Python code

[Aaron A. <aa...@cb...>]

Hi Julien,

First, thanks for the detailed error message.

While I'm no longer a main developer (and so I won't edit the public 
repository), it looks like the problem is a simple typo.

In AlternatingTree.java, there should be code that looks like this (line 
numbers may not match up):

   1051   private String makePythonCode(SplitterNode sn, String tab) {
   1052     String code = "";
   1053     
   1054     Summary summary=sn.splitter.getSummary();
   1055     
   1056     code += tab + (allDefined
   1057                    ? "    " 
   1058                    : "if def(" + (summary.index+1) + "):")
   1059             + " # " + sn.id + "\n";
   1060     String stab = (allDefined ? tab : tab);
   1061     switch(summary.type) {
   1062       case Summary.EQUALITY:
   1063         code += stab + "if self.get_data_value(x,'" + ad[(summary.index)].getAttributeName() + "') == " +
   1064         ((Integer)summary.val) + ":\n";
   1065       code += makeMatlabCode(sn.predictorNodes[0], stab + "\t");
   1066       code += stab + "else:\n";
   1067       code += makeMatlabCode(sn.predictorNodes[1], stab + "\t");
   1068       break;
   1069       case Summary.LESS_THAN:
   1070         code += stab + "if self.get_data_value(x,'" + ad[(summary.index)].getAttributeName() + "') <= " +
   1071         ((Double) summary.val) + ":\n";
   1072       code += makePythonCode(sn.predictorNodes[0], stab + "\t");
   1073       code += stab + "else:\n";
   1074       code += makePythonCode(sn.predictorNodes[1], stab + "\t");
   1075       break;
   1076       default:
   1077         throw new RuntimeException("Type of split not allowed");
   1078     }
   1079     
   1080     return code;
   1081   }


Notice the three lines:

   1065       code += makeMatlabCode(sn.predictorNodes[0], stab + "\t");
   1066       code += stab + "else:\n";
   1067       code += makeMatlabCode(sn.predictorNodes[1], stab + "\t");

These calls should be changed to recursively call the Python method 
whereas they are currently calling the matlab method:

   1065       code += makePythonCode(sn.predictorNodes[0], stab + "\t");
   1066       code += stab + "else:\n";
   1067       code += makePythonCode(sn.predictorNodes[1], stab + "\t");

You may also have to change  the line

   1064         ((Integer)summary.val) + ":\n";

So that it can handle strings (though the strings may be converted to 
integers, and this may be easier to edit once the python code has been 
outputted using a dictionary, etc).  I don't remember the exact internal 
string representation, but you can email again if you have further 
problems.

Running 'ant jar' or 'ant dist' in the top directory will compile the code 
(make sure the file 'JBOOST_DIR/dist/jboost.jar' has been updated).

Aaron



On Fri, 23 Apr 2010, Julien Hénot wrote:

> Hi all,
> 
> I am a new user of JBoost and I'm very enthusiastic and happy to use it.
> It's really simple to start and I succeed easily in having some good
> results.
> 
> I would ask you a little question.
> 
> When I run my Jboost command with generation of python code, I have this
> exception :
> 
> Exception occured while attempting to write Python code
> Message:java.lang.RuntimeException: Type of split not allowed
> java.lang.RuntimeException: Type of split not allowed
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:780)
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:751)
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:765)
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:751)
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:775)
>     at jboost.atree.AlternatingTree.makeMatlabCode(AlternatingTree.java:751)
>     at jboost.atree.AlternatingTree.makePythonCode(AlternatingTree.java:705)
>     at jboost.atree.AlternatingTree.makePythonCode(AlternatingTree.java:691)
>     at jboost.atree.AlternatingTree.toPython(AlternatingTree.java:654)
>     at jboost.controller.Controller.generateCode(Controller.java:694)
>     at
> jboost.controller.Controller.outputLearningResults(Controller.java:273)
>     at jboost.controller.Controller.main(Controller.java:91)
> 
> 
> Have you an idea ? I look the code but I did not succeed to fix the problem.
> 
> I have different types of value in my spec file : number, text, and finite
> (none,same,not)
> 
> Thanks in advance,
> 
> Regards,
> Julien Henot
>