Re: Problem Space: negatives or only positives

On Thu, May 22, 2008 at 03:08:07PM -0600, Trever L. Adams wrote:
> 
> Some texts I have seen suggest to me I want hyperspace or OSBF. 
> Hyperspace is faster and uses less memory which fits what I am after. 

note that HS' cssfile are _not_ fixed size. OTOH OSBF was refined on
email processing. You may want to check OSB, OSBF, HS plus flags and
see which one fits best.

> However, this doesn't allow for negatives. I am not sure I need or want 

at present, likely you need to do some post-proc on such :stats: to state
if sample fits into your set of classes, or lies outside.

> Is it possible to do ((A |  nA) (B | nB) ...) where nX is notWhatever? 

not avail now

> Is it possible to do something like (A B C) | D?

yes, that'd be the current 'classify (A B C | D)', ie either group A B C or D.

> answer is going to be to use negatives. The question is, based on 
> people's experience, which is best.

we've seen not many reports on multiclass systems. 
Seems that not all classifiers behave well in such case.
Hence guinea pigs are welcome ;)

-- 
paolo

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