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user:zeman:interset:how-to-use [2008/03/10 14:23]
zeman Cesta k nástrojům. 		user:zeman:interset:how-to-use [2008/03/13 17:46]
zeman Oprava.
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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 ''driver-test.pl'' without arguments.
  
   * tagset::ar::conll - Arabic CoNLL treebank (coarse, fine and feat fields in one string, delimited by tabs)   * tagset::ar::conll - Arabic CoNLL treebank (coarse, fine and feat fields in one string, delimited by tabs)
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 There is also the driver testing script, ''bin/driver-test.pl''. The distribution may contain some sample conversion scripts as well; however, these depend much more on the file format than on the tagset drivers, and thus you'll probably need to write your own anyway. There is also the driver testing script, ''bin/driver-test.pl''. The distribution may contain some sample conversion scripts as well; however, these depend much more on the file format than on the tagset drivers, and thus you'll probably need to write your own anyway.
 +
 +
  
  
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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::cs::pdt;
 +use tagset::en::penn;
 +
 +while(<>)
 +{
 +    if(s/<t>([^<]+)/<_tag_to_convert_>/)
 +    {
 +        my $tag0 = $1;
 +        my $tag1;
 +        if(exists($cache{$tag0}))
 +        {
 +            $tag1 = $cache{$tag0};
 +        }
 +        else
 +        {
 +            my $features = tagset::cs::pdt::decode($tag0);
 +            $tag1 = tagset::en::penn::encode($features);
 +            $cache{$tag0} = $tag1;
 +        }
 +        s/<_tag_to_convert_>/<t>$tag1/;
 +    }
 +    print;
 +}
 +</code>
  

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