Re: [Jboost-users] Training and getting one level tree

[Rodrigo P. <piz...@gm...>]

I think that is a bug.

I try with another training and test sets (about 5 examples of { text, =20=

label }) and i still getting one level tree with negative leafs. I =20
guess that the problem is dealing with just one text atribute.

In the file FILE_NAME.log, the text attributes says "set with zero =20
elements". The algorithm is not considering text atributes?

The predict_int() method from the generated java file (-j flag) is

   static private double[] predict_int() {
     reset_pred();
     add_pred(   /* R */
                -0.8047189562170501,
                -0.34657359027997264,
                -0.34657359027997264,
                -0.8047189562170501);

     return finalize_pred();
   }

Is a tree with just one branch, all with negative values! If you try =20
with other demo examples (with numeric, set and text atributes in each =20=

example), the method predict_int() contanins many if-then-else =20
statements, representing all the tree.

I'm in the right?

Rodrigo Pizarro G.
Ingenier=EDa Inform=E1tica
Universidad de Santiago de Chile




El 28-01-2008, a las 14:58, Aaron Arvey escribi=F3:

> Try doing something along the lines of
>
> ./jboost -b AdaBoost -numRounds 1000 -a -2 -S FILE_NAMES -ATreeType =20=

> ADD_ALL
>
> The output tree is going to be incomprehensible no matter what (620 =20=

> labels is just too much to view visually).  You also probably have =20
> an outdated copy of atree2dot2ps.pl.  Grab the latest version from =20
> CVS and see if that works any better for you.  Zoom into the =20
> postscript file (png,gif zoom will be blury, postscript is vector =20
> graphics -- I think). Directions for CVS are at =
http://sourceforge.net/cvs/?group_id=3D195659=20
> .
>
> Also, look at the FILE_NAME.info file and see what the error is.  =20
> This will give you a good idea as to the actuall progress of the =20
> booster.  If error is going down, then you know that something good =20=

> is happening.  If error is staying very high, then there may be a =20
> bug or some other problem.
>
> Aaron
>
>
> On Mon, 28 Jan 2008, Rodrigo Pizarro wrote:
>
>> Hi,
>>
>> i'm training jBoost with examples of the type (text, label). There is
>> 620 different labels, 1720 training examples, and 1600 test examples.
>> The problem is that the output tree has only one level with 620
>> branches  and all the branches has negative values!!!
>>
>> JBoost deals correctly with text attributes? is there some bug? I
>> tried with many different run parameters, but i still get similar
>> wreid outputs. Please, any suggestion?
>>
>> Many Thanks beforehand!
>>
>> Rodrigo Pizarro G.
>> Ingenier=EDa Inform=E1tica
>> Universidad de Santiago de Chile
>>
>>
>>
>>
>>
>> =
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