def DFS_bound2(start, goal, depth, cycle_detection=True, verbose=False):
bases, _, patterns, columns = rank.get_information(start) #parameters for unrank
frontier = []
start_int = rank.rank(start) #convert start matrix to its rank integer
frontier.append([start_int])
while frontier:
path = frontier.pop()
last_vertex = path[-1]
# convert to matrix for goal and neighbors
matrix_last = unrank.unrank(last_vertex, bases, patterns, columns)
if is_goal(matrix_last, goal):
if verbose: #if asked by user, print path
print(path)
print("length:", len(path))
return path
if len(path) == depth:
continue
for next_vertex in neighbors(matrix_last):
int_next = rank.rank(next_vertex) #convert neighbor matrix to integer
if cycle_detection:
if int_next in path:
continue
new_path = path + [int_next]
frontier.append(new_path)
return None
def DFS_prune2(start, goal, verbose=False):
bases, _, patterns, columns = rank.get_information(start) #parameters for unrank
frontier = []
start_int = rank.rank(start) #convert start matrix to its rank integer
frontier.append([start_int])
#figure out size of visited array (by multiplying bases) and initialize it
prod = 1
for i in bases:
prod *= i
visited = [False for u in range(prod)]
visited[start_int] = True
while frontier:
path = frontier.pop()
last_vertex = path[-1]
# convert to matrix for goal and neighbors
matrix_last = unrank.unrank(last_vertex, bases, patterns, columns)
if is_goal(matrix_last, goal):
if verbose: #if asked by user, print path
print(path)
print("length:", len(path))
return path
for next_vertex in neighbors(matrix_last):
int_next = rank.rank(next_vertex) #convert neighbor matrix to integer
if visited[int_next]:
continue
new_path = path + [int_next]
visited[int_next] = True
frontier.append(new_path)
return None
def BFS3(start, goal, cycle_detect=False, verbose=False, ranking=False):
frontier = []
if ranking:
bases, _, patterns, columns = rank.get_information(start)
start_int = rank.rank(start)
frontier.append([start_int])
#figure out size of visited array (by multiplying bases) and initialize it
prod = 1
for i in bases:
prod *= i
visited = [False for u in range(prod)]
visited[start_int] = True
else:
frontier.append([start])
while frontier:
path = frontier.pop(0) #select and remove first path from frontier
last_vertex = path[-1]
if ranking:
# convert from integer to matrix to check if goal and/or find neighbors
last_vertex = unrank.unrank(last_vertex, bases, patterns, columns) ####!!!!!####
if is_goal(last_vertex, goal): #check if last vertex in path is goal
if verbose: #if asked by user, print each vertex(matrix) in path
if ranking:
print(path)
else:
for matrices in path:
for line in matrices:
print(line)
print()
print(len(path)) #print length of solution for convenience
return path
#enter procedure here, if user asked to use ranking/unranking
if ranking:
for next_vertex in neighbors(last_vertex): ###!!!###
int_next = rank.rank(next_vertex) #convert neighbor matrix to integer
if cycle_detect:
if visited[int_next]:
continue
new_path = path + [int_next]
visited[int_next] = True
frontier.append(new_path)
#enter procedure here, if user did not want to use ranking/unranking
else:
for next_vertex in neighbors(last_vertex):
if cycle_detect: #include cycle detection if asked for
if next_vertex in path:
continue
new_path = path + [next_vertex]
frontier.append(new_path)
return None
def LCFS2(start, goal, pruning=True, verbose=False):
bases, _, patterns, columns = rank.get_information(
start) #parameters for unrank
start_int = rank.rank(start) #convert start matrix to its rank integer
#frontier will look like [(cost, [path]), (cost, [path]), (cost, [path]),...]
frontier = [] #this frontier will be used as a heap
heapq.heappush(
frontier,
(0, [start_int])) #heap prioritized by first element of tuple
# figure out size of visited array (by multiplying bases) and initialize it
prod = 1
for i in bases:
prod *= i
visited = [False for u in range(prod)]
visited[start_int] = True
while frontier:
#path_tuple = (cost, [path])
path_tuple = heapq.heappop(
frontier) #select and remove first path tuple from frontier
#last_vertex = path[-1] from path_tuple
last_vertex = path_tuple[1][-1]
# convert from integer to matrix to check if goal and/or find neighbors
matrix_last = unrank.unrank(last_vertex, bases, patterns, columns)
if is_goal(matrix_last, goal): #check if last vertex in path is goal
if verbose: #if asked by user, print each vertex(matrix) in path
print(path_tuple[1])
print("cost\t:",
path_tuple[0]) #print cost of soln for convenience
print("length\t:", len(
path_tuple[1])) #print length of solution for convenience
return path_tuple
for next_tuple in neighbors(matrix_last, with_cost=True):
int_next = rank.rank(next_tuple[1])
if pruning: #include cycle detection if asked for
if visited[int_next]:
continue
new_path = (path_tuple[0] + next_tuple[0],
path_tuple[1] + [int_next])
visited[int_next] = True
heapq.heappush(frontier, new_path)
return None