CFG fromString for Questions





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Say i generate grammar for a question using pystatparser, and get the productions from it, is it possible to convert it to a CFG using nltk CFG fromString method?
Example input from PyStatParser:



(NP+SBAR (WHNP (WP what)) (S+VP (VBZ is) (NP (DT a) (NN cat))))


After converting to productions:



NP+SBAR -> WHNP S+VP

WHNP -> WP

WP -> 'what'

S+VP -> VBZ NP

VBZ -> 'is'

NP -> DT NN

DT -> 'a'

NN -> 'cat'


If i give production as string input CFG.fromString i get a value error 



ValueError: Unable to parse line 1: NP+SBAR -> WHNP S+VP

Expected an Arrow


Can you please help and let me know what mistake im making?






python nltk context-free-grammar penn-treebank







share|improve this question























  • Is the symbol + causing a problem?

    – user2401464
    Jan 3 at 9:38


















0















Say i generate grammar for a question using pystatparser, and get the productions from it, is it possible to convert it to a CFG using nltk CFG fromString method?
Example input from PyStatParser:



(NP+SBAR (WHNP (WP what)) (S+VP (VBZ is) (NP (DT a) (NN cat))))


After converting to productions:



NP+SBAR -> WHNP S+VP

WHNP -> WP

WP -> 'what'

S+VP -> VBZ NP

VBZ -> 'is'

NP -> DT NN

DT -> 'a'

NN -> 'cat'


If i give production as string input CFG.fromString i get a value error 



ValueError: Unable to parse line 1: NP+SBAR -> WHNP S+VP

Expected an Arrow


Can you please help and let me know what mistake im making?






python nltk context-free-grammar penn-treebank







share|improve this question























  • Is the symbol + causing a problem?

    – user2401464
    Jan 3 at 9:38














0












0








0








Say i generate grammar for a question using pystatparser, and get the productions from it, is it possible to convert it to a CFG using nltk CFG fromString method?
Example input from PyStatParser:



(NP+SBAR (WHNP (WP what)) (S+VP (VBZ is) (NP (DT a) (NN cat))))


After converting to productions:



NP+SBAR -> WHNP S+VP

WHNP -> WP

WP -> 'what'

S+VP -> VBZ NP

VBZ -> 'is'

NP -> DT NN

DT -> 'a'

NN -> 'cat'


If i give production as string input CFG.fromString i get a value error 



ValueError: Unable to parse line 1: NP+SBAR -> WHNP S+VP

Expected an Arrow


Can you please help and let me know what mistake im making?






python nltk context-free-grammar penn-treebank







share|improve this question














Say i generate grammar for a question using pystatparser, and get the productions from it, is it possible to convert it to a CFG using nltk CFG fromString method?
Example input from PyStatParser:



(NP+SBAR (WHNP (WP what)) (S+VP (VBZ is) (NP (DT a) (NN cat))))


After converting to productions:



NP+SBAR -> WHNP S+VP

WHNP -> WP

WP -> 'what'

S+VP -> VBZ NP

VBZ -> 'is'

NP -> DT NN

DT -> 'a'

NN -> 'cat'


If i give production as string input CFG.fromString i get a value error 



ValueError: Unable to parse line 1: NP+SBAR -> WHNP S+VP

Expected an Arrow


Can you please help and let me know what mistake im making?






python nltk context-free-grammar penn-treebank




python nltk context-free-grammar penn-treebank






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Jan 3 at 9:02









user2401464user2401464

2072515




2072515













  • Is the symbol + causing a problem?

    – user2401464
    Jan 3 at 9:38



















  • Is the symbol + causing a problem?

    – user2401464
    Jan 3 at 9:38

















Is the symbol + causing a problem?

– user2401464
Jan 3 at 9:38





Is the symbol + causing a problem?

– user2401464
Jan 3 at 9:38












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