python - Difference between nltk.parse.recursivedescent and nltk.parse.rd? -

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would please explain difference between 2 python modules nltk.parse.recursivedescent , nltk.parse.rd?

it seems former automatically included when import nltk ipython, interested in using 1 of methods included in latter (nbest_parse), mentioned in the 2009 print edition of book "natural language processing python" omitted in current on-line version. method outdated, , use in place see multiple options parsing ambiguous sentence without falling infinite loop "parse_all".

thanks in advance.


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