pgass
Python bindings for pgass, a pretty good answer set solver. Build and solve answer set programs as typed Python classes:
import pgass
class Node(pgass.Predicate):
x: int
class Edge(pgass.Predicate):
x: int
y: int
class Cover(pgass.Predicate):
x: int
X, Y = pgass.vars("X Y")
program = pgass.Program()
program.add(Node(x) for x in range(1, 6))
program.add(Edge(x, y) for x, y in
[(1, 2), (2, 3), (3, 4), (4, 5), (5, 1), (1, 3)])
program.add(pgass.choice(Cover(X)) << Node(X))
program.forbid(Edge(X, Y) & ~Cover(X) & ~Cover(Y))
program.minimize(Cover(X), weight=1, priority=0)
for answer_set in program.solve(models=0):
print(sorted(c.x for c in answer_set[Cover]), answer_set.cost)
This is a minimum vertex cover: program.forbid says no edge may go
uncovered at both ends, and program.minimize asks for the fewest covered
nodes. See the root README for what
pgass itself does and how the CLI works.
1 maintainer
Metadata
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Release files for pgass 1.0.4
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