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3sat and grover fixes

This commit is contained in:
Daniel Tsvetkov 2020-03-09 09:42:55 +01:00
parent fcca3afacc
commit 4e69938d7b
2 changed files with 19 additions and 4 deletions
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4
3sat.py
View File

@ -3,7 +3,7 @@ import itertools
import random import random
from pprint import pprint from pprint import pprint
from grover import classical_func_search from grover import classical_func_search_multi_rv
class X(object): class X(object):
@ -88,7 +88,7 @@ def classical_3sat(func):
# Generate all possible true/false tupples for the 3-sat problem # Generate all possible true/false tupples for the 3-sat problem
input_range = list(itertools.product([True, False], repeat=func.predicates)) input_range = list(itertools.product([True, False], repeat=func.predicates))
random.shuffle(input_range) random.shuffle(input_range)
return classical_func_search(func, input_range) return classical_func_search_multi_rv(func, input_range)
def main(): def main():

19
grover.py
View File

@ -4,7 +4,7 @@ import random
from pprint import pprint from pprint import pprint
def classical_func_search(func, input_range): def classical_func_search_multi_rv(func, input_range):
"""Grover’s algorithm takes a function, searches through """Grover’s algorithm takes a function, searches through
the implicit list of possible inputs to that function, and the implicit list of possible inputs to that function, and
returns inputs that causes the function to return true. returns inputs that causes the function to return true.
@ -17,6 +17,21 @@ def classical_func_search(func, input_range):
return rv return rv
def classical_func_search_single_rv(func, input_range):
"""Grover’s algorithm takes a function, searches through
the implicit list of possible inputs to that function, and
returns EXACTLY ONE input that causes the function to return true.
"""
rv = None
for i, params in enumerate(input_range):
result = func(params)
if result and rv is None:
rv = result
else:
raise Exception("Exactly one result is needed")
return rv
def _3sat(params): def _3sat(params):
# https://cstheory.stackexchange.com/questions/38538/oracle-construction-for-grovers-algorithm # https://cstheory.stackexchange.com/questions/38538/oracle-construction-for-grovers-algorithm
# 3-SAT from here: https://qiskit.org/textbook/ch-applications/satisfiability-grover.html # 3-SAT from here: https://qiskit.org/textbook/ch-applications/satisfiability-grover.html
@ -32,7 +47,7 @@ def classical_3sat(func):
# Generate all possible true/false tupples for the 3-sat problem # Generate all possible true/false tupples for the 3-sat problem
input_range = list(itertools.product([True, False], repeat=3)) input_range = list(itertools.product([True, False], repeat=3))
random.shuffle(input_range) random.shuffle(input_range)
return classical_func_search(func, input_range) return classical_func_search_multi_rv(func, input_range)
def main(): def main():