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parsery [2007/10/16 19:03]
zeman Unwanted wiki markup. |
parsery [2007/10/16 21:55] (current)
zeman N-best parsing with Charniak. |
| make all | make all |
| </code> | </code> |
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| Both folders, ''charniak-parser'' and ''brown-reranking-parser'', have a ''scripts'' subfolder with the basic set of ''parse.pl'', ''cluster-parse.pl'', and ''train.pl''. These scripts are invoked in much the same fashion as for the Stanford parser (see above). | Both folders, ''charniak-parser'' and ''brown-reranking-parser'', have a ''scripts'' subfolder with the basic set of ''parse.pl'', ''cluster-parse.pl'', and ''train.pl''. These scripts are invoked in much the same fashion as for the Stanford parser (see above). |
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| Although Charniak parser can output n best parses for each sentence, the scripts currently do not support that. You would have to go into the scripts and add ''-N5'' (replace 5 by the N you want) to the ''parseIt'' command line. The output will also show you the log prob of the parse. | The ''parse.pl'' and ''cluster-parse.pl'' scripts of the Charniak parser accept the ''-Nbest'' option, in addition to standard options of these scripts. ''-Nbest 50'' translates as ''-N50'' on Charniak's ''parseIt'' commandline. It asks the parser to output N (here 50) best parses, instead of just one. The output format for N>1 differs from the default: the set of parses is preceded by a line with the number of parses and the ID (number) of the sentence, and every parse is preceded by a line with the weight (log probability) of the parse. This option only applies to ''charniak-parser''. It is ignored by ''brown-reranking-parser''. |
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| === Training === | === Training === |
