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user:zeman:interset:how-to-use [2008/03/10 13:10] zeman New location of the drivers. |
user:zeman:interset:how-to-use [2008/03/13 17:45] zeman Caching. |
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=== Existing drivers === | === Existing drivers === | ||
+ | |||
+ | Note: This list may not be up-to-date. To see what drivers are currently available on your system, call '' | ||
* tagset:: | * tagset:: | ||
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Besides drivers, there is a library of useful functions that can be called from within drivers: '' | Besides drivers, there is a library of useful functions that can be called from within drivers: '' | ||
- | There is also the driver testing script, '' | + | There is also the driver testing script, '' |
+ | |||
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You can write your own tag conversion Perl script, and use the Interset driver library. You have to tell Perl where to find the drivers: | You can write your own tag conversion Perl script, and use the Interset driver library. You have to tell Perl where to find the drivers: | ||
- | < | + | < |
+ | setenv PATH / | ||
Once the variable is set, writing a conversion script is very easy. For instance, my '' | Once the variable is set, writing a conversion script is very easy. For instance, my '' | ||
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Note the two-step replacement of the original tag. I do not dare to use the original tag in a regular expression because there could be special characters in the tag. | Note the two-step replacement of the original tag. I do not dare to use the original tag in a regular expression because there could be special characters in the tag. | ||
+ | |||
+ | Some operations performed by the drivers (especially when encoding) are not trivial. While you may not observe long processing times for toy runs, it might matter once you start converting millions of tags in a big corpus. Then you may want to use up the fact that there are tens to thousands of tags, and cache their translations like in the following example: | ||
+ | |||
+ | <code perl> | ||
+ | use tagset:: | ||
+ | use tagset:: | ||
+ | |||
+ | while(<> | ||
+ | { | ||
+ | if(s/< | ||
+ | { | ||
+ | my $tag0 = $1; | ||
+ | my $tag1; | ||
+ | if(exists($cache{$tag0})) | ||
+ | { | ||
+ | $tag1 = $cache{$tag0}; | ||
+ | } | ||
+ | else | ||
+ | { | ||
+ | my $features = tagset:: | ||
+ | $tag1 = tagset:: | ||
+ | } | ||
+ | s/< | ||
+ | } | ||
+ | print; | ||
+ | } | ||
+ | </ | ||