RE: [Classifier4j-devel] First look at classifier4j...

[Nick L. <nl...@es...>]

Welcome!

I'm very interested in having help.

1) I hadn't noticed the problems with the zip file. I'll have to check that
- you are talking about the Source zip?. 
I just zipped the source with WinZip, so it doesn't surprise me.

2) I'm reasonably familiar with Hibernate (in theory at least). I'm
reluctant to replace the JDBC Data Source with a Hibernate one because I
want to make Classifier4J very easy to drop into people's code without too
many dependencies. However, I'm not opposed to a HibernateWordsDataSource if
you'd like to work on that. Please be aware that there are performance
problems at the moment when using a database backend, and I'm not convinced
that a normal DB backend will 
ever be able to deliver sufficient performance on large documents. I think
I'll need to have a table that contains the
precalculated word probability for each word to get rid of the
two-queries-per word issue
<http://classifier4j.sourceforge.net/task-list.html#net.sf.classifier4J.baye
sian.JDBCWordsDataSource.methods>). I'm not stuck on the DB schema anyway,
so if something else works better with Hibernate the go with it.

3) Yeah. I'm thinking an extra column on the *_words tables that joins to a
classifier_types table or something. 

Any comments on the API - net.sf.classifier4J.IClassifier
(<http://classifier4j.sourceforge.net/apidocs/net/sf/classifier4J/IClassifie
r.html>) in particular?

Thanks for the feedback.

Nick

-----Original Message-----
From: Peter Leschev [mailto:pe...@le...]
Sent: Tuesday, 1 July 2003 10:03 PM
To: cla...@li...
Subject: [Classifier4j-devel] First look at classifier4j...


Heya,

            I need a Bayesian classifier for a pet project that I'm going to
be working on. Instead of reinventing the wheel, I thought I'd check out
what was available....

I'd like to help out with this project (If you're interested that is!)...

I understand that 0.2 was an initial release, so I'm probably stating the
obvious here, anyhow, here are a couple of suggestions:

- Deployment
    - The zip file has CVS entries in it. From memory, performing a zip from
ant doesn't include the CVS entries by default.
    - Also would be nice if all the files where under "Classifier4J-0.2"
instead of "."....

- Database
    - I would recommend using hibernate (http://hibernate.bluemars.net)
instead of directly using JDBC. I've used this product with other projects
and I wholeheartedly recommend it. This would allow classifier4j get cached
query results etc for free... Also keeps the code cleaner...

- Currently the model only supports one classifier in the database, I would
require a number of separate classifiers to be stored in the database.

Pete