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From: "Justin Mason" <zzzzzz@zzzzzz.org>
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Subject: [SAtalk] spam-phrases existing algo
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Date: Sat, 17 Aug 2002 16:45:08 +0100 (IST)
BTW, I should not that this algorithm Paul Graham uses is
very close to what we've got in spam-phrases code already.
To turn it into pcode:
mass-check for spamphrases:
- get mail body, strip HTML, attachments and mail formatting
- strip stopwords ("to", "of", "a" etc.)
- find pairs of 3-20 letter words
- foreach pair:
- skip pair if one word is in stoplist of common terms
- ++ the frequency of that word-pair
settle-phrases -- turn mass-check results into a spamphrases file
- read all spam word-pairs, let NS = number of word-pairs
- read all nonspam word-pairs, let NN = number of word-pairs
- let bias = NS / NN (compensates for different corpus size)
- foreach nonspam word-pair:
- wpfreq = (freq in spam) - (frequency in nonspam * bias)
- foreach spam word-pair:
- if (wordpair was not found in nonspam):
- wpfreq *= 10
- note the highest score of all rules
scoring of an incoming message:
- get mail body, strip HTML, attachments and mail formatting
- strip stopwords ("to", "of", "a" etc.)
- find pairs of 3-20 letter words
- foreach pair:
- score += ((wpfreq*10) / highest_score_of_all_rules)
- foreach "!" found in text:
- score++
- return result as "spam phrase score".
So it's quite close to PG's algo, but he also tracks the non-spam
word-pairs -- which we don't do for SpamAssassin, because they
overfit to the mass-checker's nonspam mail corpus (generally
names of friends, etc.)
--j.
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