robmch / cyk-parser Goto Github PK
View Code? Open in Web Editor NEWA CYK parser written in Python 3.
License: MIT License
A CYK parser written in Python 3.
License: MIT License
Using the following grammar B C
is not recognised:
S -> A
B -> 'B'
C -> 'C'
A -> B C
Moving A -> B C
up seems to fix it:
S -> A
A -> B C
B -> 'B'
C -> 'C'
This is obviously a bug.
Hi,
I want to use the following grammar which I have previously used in NLTK:
S -> L S | L
L -> 'A' F 'U' | 'A' | 'U' F 'A' | 'U' | 'C' F 'G' | 'C' | 'G' F 'C' | 'G'
F -> 'A' F 'U' | 'U' F 'A' | 'C' F 'G' | 'G' F 'C' | L S
Nothing -> None
But it shows an error for the sequence "ACCCUGGAU" that "The given sequence is not in the language produced by the grammar". How can I solve it?
the grammar converter has a bug when a rule has more than 3 elements on the right hand side of the rule.
for example, this:
S -> A B C D M
converts to:
[['S', 'S2', 'MODEL'], ['S0', 'A', 'B', 'S1', 'S0', 'C', 'S2', 'S1', 'D'], ['A', "'I'"], ['B', "'w'"], ['D', "'d'"], ['C', "'l'"], ['M', "'m'"]]
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