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On Fri, Jul 24, 2015 at 10:17:18AM -0700, waterdog wrote:
> Okay, I apologize for all the following questions but, the more I
> troubleshoot dspam without progress, the more questions I have.
>
> Are there recommendations/documentation on how to properly train? It seems
> that some users do corpus training and other users just train based on
> actual messages.
>
> What are the pros/cons of using a corpus vs. actual messages?
>
> Does it help to retrain multiple times using the same corpus and/or
> messages?
>
> What are the specific stats that one should look to achieve to determine if
> dspam has had enough training?
>
> Does TL need to be at zero before dspam will work at all?
>
> Do you have to train separately for each user or can all users share the
> same training?
>
> I've tried training and retraining multiple times using corpuses and actual
> messages but don't seem to be making any real progress. Here are my current
> stats after training with a corpus:
>
> sudo dspam_train <username> spam_2 easy_ham_2
>
> sudo dspam_stats -H <username>
>
> TP True Positives: 0
> TN True Negatives: 1315
> FP False Positives: 2443
> FN False Negatives: 2154
> SC Spam Corpusfed: 0
> NC Nonspam Corpusfed: 0
> TL Training Left: 0
> SHR Spam Hit Rate 0.00%
> HSR Ham Strike Rate: 65.01%
> PPV Positive predictive value: 0.00%
> OCA Overall Accuracy: 22.24%
>
> As you can see, the OCA is still low but better than it was before.
>
> It might help if someone could post working configurations for postfix,
> dspam, dovecot, and clamAV for comparison. I've tried to follow the online
> documentation but apparently I'm missing something.
>
Hi,
I am not sure what your training corpus looks like, but those are pretty bad
as results. Training a global/merged group can reduce the accuracy hit at
the beginning, but in general, using a train-on-error setup, with no initial
training would probably be better. Training with some valid good content is
good if your ham/spam ratio is very small. The accuracy is best with an even
mix of spam/ham to start. Then the TOE will keep it balanced.
Regards,
Ken
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