macw at cmu.edu
Thu Sep 20 17:37:47 EDT 2018
In order to further improve the accuracy of the POST (part of speech tagger) program for English and other languages, we have added a new facility called PREPOST. This facility supplements the operation of POSTMORTEM. Unlike POSTMORTEM, it runs right at the end of MOR when ambiguities have not yet been resolved. This provides additional flexibility for correcting errors in difficult choices such as that between the auxiliary and the copula in English. Here is the new description of PREPOST from the manual:
> The PREPOST program provides a second method for resolving ambiguities that are not fully handled by POST. Because it runs before POST, PREPOST has full access to the ambiguous structures created by MOR. This means that it can refer to ambiguities in full detail to create a more specific environment for disambiguation. This is particularly useful in resolving the ambiguity between the copula and auxiliary in English, as illustrated in these PREPOST rules:
> cop|*^aux|* neg|not adj|* => cop|* neg|not adj|*
> cop|*^aux|* det:num|* => cop|* det:num|*
> In the first rule the copula is chosen in a sequence such as is not fun. In the second rule, the copula is chosen in a sequence such as is five in a sentence such as Tim is five years old. Care must be taken in the formulating PREPOST rules to avoid overgeneralizations to incorrect cases.
Unfortunately, there was an error in the PREPOST file on Monday. The PREPOST rules file is included in the ENG MOR grammar. So, if you downloaded a copy of English MOR that day, you should get a new copy. That error made MOR/POST totally fail. So, it will be quite clear if you possibly got this bad copy. The copies on the web now have no problems.
When using the new PREPOST facility, you also need to get a new version of CLAN.
-- Brian MacWhinney
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