Re: [Classifier4j-devel] Several questions regarding Classifier4J

[Nick L. <ni...@ma...>]

 

>>
>>> - Is there any support of storing the ratings in a file and reload 
>>> it on next JVM startup (some sort of
>>>  Serialisation)?
>>>   
>>
>>
>> I don't know the answer to this.  From my dealings with it,
>> all results are stored in a database.
>>  
>>
> So what kind of database are you using? Is it a real database
> that is running on a server, or some sort of file-based DB?
>

Classifier4J supports SQL based databases (tested with MySQL & HSQLDB) 
and the JDBM non-relational database. I would recommend the JDBM 
database for performance reasons.

>>  
>>
>>> - Is it possible to have a better rating granularity than just match 
>>> and not match? I thought of something like
>>>   5 rating levels that a news may be rated (very good, good, 
>>> moderate, bad, very bad).
>>>   
>>
>>
>> Well - the matching returns a percentage match I think.  So
>> you could test the returned result and say, for example.. that
>> a 0-.2 would be very good, .2-.4 good, .4-.6 moderate, etc.
>>  
>>
> Well I am talking of the other way, giving good or moderate as
> input into classifier4j. Using trainMatch and trainNonMatch
> this does not seem to be possible.


This would be possible in theory, but there is no support for it in C4J 
and it would be quite a lot of work to add it.

Nick