Python library to convert between AIGER and CNF
Project description
py-aiger-cnf
Python library to convert between AIGER and CNF
Table of Contents
Installation
If you just need to use aiger_cnf
, you can just run:
$ pip install py-aiger-cnf
For developers, note that this project uses the poetry python package/dependency management tool. Please familarize yourself with it and then run:
$ poetry install
Usage
The primary entry point for using aiger_cnf
is the aig2cnf
function which, unsurprisingly, maps AIG
objects to CNF
objects.
import aiger
from aiger_cnf import aig2cnf
x, y, z = map(aiger.atom, ('x', 'y', 'z'))
expr = (x & y) | ~z
cnf = aig2cnf(expr.aig)
Note that this library also supports aiger
wrapper libraries so long
as they export a .aig
attribute. Thus, could also
write:
cnf = aig2cnf(expr)
The CNF
object is a NamedTuple
with the following three fields:
clauses
: A list of tuples of ints, e.g.,[(1,2,3), (-1, 2)]
. Each integer represents a variable's id, with the sign indicating the polarity of the variable.symbol_table
: A bidict from strings to variable ids.max_var
: The maximum (in absolute value) index present inclauses
.
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