Re: [libann-users] Feature map is unbalanced

[John Darrington]

On Sat, Jun 28, 2003 at 08:30:12AM +0200, Johnny Wezel wrote:
     I'm getting an exception "Feature map is unbalanced" which I don't 
     understand.

This means that the training data has an unequal number of samples per
class, and would therefore bias the result.  One gotcha is that if you
call 


fm.addFeature("class1", featureA);
fm.addFeature("class1", featureB);

and featureA happens to be identical to featureB then in fact, class1
will get only one feature.  This is a result of ann::FeatureMap being
derived from std::set.  In future versions perhaps it'll derive from 
std::multiset instead.


J'


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