def solve(num_vars, clauses, maxflips):
UpdateUnsatWeights = localsearch.incrementUnsatWeights
RndInterpretationGenerator = localsearch.randomInterpretation
InitializeClausesData = localsearch.initializeWeightedClausesData
ChoseAndFlipVar = localsearch.weightedChoseAndFlipVar
num_clauses = len(clauses)
var_range = xrange(1, num_vars+1)
flip_range = xrange(maxflips)
litclauses = datautil.classifyClausesByVariable(num_vars, clauses)
csatlits = { c: 0 for c in clauses }
cweight = { c : 1 for c in clauses }
while True:
rintp = RndInterpretationGenerator(num_vars)
num_satclauses = InitializeClausesData(clauses, rintp, csatlits,
cweight)
if num_satclauses == num_clauses:
return rintp
for i in flip_range:
num_satclauses = ChoseAndFlipVar(litclauses, rintp, csatlits,
cweight, num_satclauses,
var_range)
if num_satclauses == num_clauses:
return rintp
UpdateUnsatWeights(clauses, rintp, cweight)
def solve(num_vars, clauses, maxflips):
UpdateUnsatWeights = localsearch.incrementUnsatWeights
RndInterpretationGenerator = localsearch.randomInterpretation
InitializeClausesData = localsearch.initializeWeightedClausesData
ChoseAndFlipVar = localsearch.weightedChoseAndFlipVar
num_clauses = len(clauses)
var_range = xrange(1, num_vars + 1)
flip_range = xrange(maxflips)
litclauses = datautil.classifyClausesByVariable(num_vars, clauses)
csatlits = {c: 0 for c in clauses}
cweight = {c: 1 for c in clauses}
while True:
rintp = RndInterpretationGenerator(num_vars)
num_satclauses = InitializeClausesData(clauses, rintp, csatlits,
cweight)
if num_satclauses == num_clauses:
return rintp
for i in flip_range:
num_satclauses = ChoseAndFlipVar(litclauses, rintp, csatlits,
cweight, num_satclauses,
var_range)
if num_satclauses == num_clauses:
return rintp
UpdateUnsatWeights(clauses, rintp, cweight)
def solve(num_vars, clauses, maxflips, wprob):
"""
Solve(num_vars, clauses, litclauses, maxflips, wprob) -> [None,bool,...]
Try to find an interpretation that satisfies the given formula.
The solution is composed by list of boolean values, but the first element
(index 0) should be None. Otherwise an error has happened.
Note: there can't be repeated clauses or literals into a clause in the
formula
"""
UpdateUnsatWeights = localsearch.incrementUnsatWeights
RndInterpretationGenerator = localsearch.randomInterpretation
InitializeClausesData = localsearch.initializeWeightedClausesData
ChoseAndFlipVar = localsearch.weightedChoseAndFlipVar
num_clauses = len(clauses)
var_range = xrange(1, num_vars+1)
flip_range = xrange(maxflips)
litclauses = datautil.classifyClausesByVariable(num_vars, clauses)
csatlits = { c: 0 for c in clauses }
cweight = { c : 1 for c in clauses }
while True:
rintp = RndInterpretationGenerator(num_vars)
num_satclauses = InitializeClausesData(clauses, rintp, csatlits,
cweight)
if num_satclauses == num_clauses:
return rintp
for i in flip_range:
prob = random.random()
if prob < wprob:
num_satclauses = randomWalk(clauses, litclauses, rintp,
csatlits, num_satclauses)
else:
num_satclauses = ChoseAndFlipVar(litclauses, rintp, csatlits,
cweight, num_satclauses,
var_range)
if num_satclauses == num_clauses:
return rintp
UpdateUnsatWeights(clauses, rintp, cweight)
