#1 An error occurs when running JgibbLDA

[Ming Hsuan Tu]

When I follow the document of JgibbLDA.
I can not generate any output from that.
My Operating system is Ubuntu 10.04.
And type command just follow the document, that is (From scratch):
$ java -mx512M -cp bin:lib/args4j-2.0.6.jar jgibblda.LDA -est -alpha 0.5 -beta 0.1 -ntopics 100 -niters 1000 -savestep 100 -twords 20 -dfile models/casestudy/newdocs.dat
The error message occurs when saving the output to disk.
It is that:
Error while saving model tassign: null
java.lang.NullPointerException
at jgibblda.Model.saveModelTAssign(Model.java:276)
at jgibblda.Model.saveModel(Model.java:410)
at jgibblda.Estimator.estimate(Estimator.java:89)
at jgibblda.LDA.main(LDA.java:50)

I am not sure whether that is a bug.

How can I solve that?

Thanks in advance.

[Latest Tom]

I'm also having the same problem!

This is the output from command line.

Iteration 999 ...
Gibbs sampling completed!

Saving the final model!

Error while saving model tassign: null
java.lang.NullPointerException
at jgibblda.Model.saveModelTAssign(Model.java:276)
at jgibblda.Model.saveModel(Model.java:410)
at jgibblda.Estimator.estimate(Estimator.java:89)
at jgibblda.LDA.main(LDA.java:50)

In the beginning I'm getting this error also

Read Dataset Error: \models\casestudy-en\newdocs.dat (The system cannot find the path specified)
java.io.FileNotFoundException: \models\casestudy-en\newdocs.dat (The system cannot find the path specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at jgibblda.LDADataset.readDataSet(LDADataset.java:154)
at jgibblda.Model.initNewModel(Model.java:476)
at jgibblda.Estimator.init(Estimator.java:45)
at jgibblda.LDA.main(LDA.java:49)
Fail to read training data!</init></init>

Sampling 1000 iteration!
Iteration 1 ...

I think the error is because the file is not reading. How to fix this error?

[Mostafa]

use this:

$ java -mx512M -cp bin:lib/args4j-2.0.6.jar jgibblda.LDA -est -alpha 0.5 -beta 0.1 -ntopics 100 -niters 1000 -savestep 100 -twords 20 -dir models/casestudy-en -dfile newdocs.dat

you have to set [-dir] based on correct directory name.