schofield at ftw.at
Sat Mar 18 16:32:57 CST 2006
On 18/03/2006, at 1:31 AM, Matthew Cooper wrote:
> Hi Ed,
> Thanks again for working on this. I can try and work on it a bit
> this weekend. I've had time to look over the two example scripts
> you provided. There seemed to be some difference in the two in
> terms of the call to the conditionalmodel fit method. In the low
> level example, the count parameter seemed to provide the empirical
> counts of the feature functions, where the features were simply
> (context,label) co-occurrence. In the high level example, the
> features are more complicated, and the counts parameter seems to
> have different dimensionality. I'll try and get a working high
> level example together next.
I've now found and fixed some bugs in the conditional maxent code.
The computation of the conditional expectations was wrong, and the
p_tilde parameter was interpreted inconsistently. Both the examples
work now! Fantastic!
I'd be very grateful for any assistance you could give in providing
more examples -- especially real examples from text classification.
The two examples at the moment are too artificial and perhaps a bit
confusing. Or if you have any suggestions or patches for simplifying
the interface (e.g. the constructor arguments) or any other
improvements (e.g. bug fixes, better docs, or a tutorial) I'd also
readily merge them.
Let me know how you go with it. When you're happy that it's all
working, I'll merge it with the main SVN trunk.
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