Combining tokens gives context. It allows you to differentiate to an extent between 'are you free tonight' and 'debt free' 'free widgets' etc.

If you just run on 'free' as a word you lose sensitivity as this is quite common. Using consecutive tokens is the way to go IMHO and is the method employed in voice recognition (Dragon used to use 2 words for context and IBM 3 I believe).

The price is size and speed based. To give you and idea our single word token file is ~ 100K, the two word token file is ~ 10MB and the three word token file > 1GB You will note a rough 2 order of magnitude increase in size as you add length to the phrases.

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

In reply to Re: Re: Re: Spam filtering regexp - keyword countermeasure countermeasure by tachyon
in thread Spam filtering regexp - keyword countermeasure countermeasure by John M. Dlugosz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.