Newer
Older
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
def test_csp_assign():
var = 10
val = 5
assignment = {}
australia.assign(var, val, assignment)
assert australia.nassigns == 1
assert assignment[var] == val
def test_csp_unassign():
var = 10
assignment = {var: 5}
australia.unassign(var, assignment)
assert var not in assignment
def test_csp_nconflits():
map_coloring_test = MapColoringCSP(list('RGB'), 'A: B C; B: C; C: ')
assignment = {'A': 'R', 'B': 'G'}
var = 'C'
val = 'R'
assert map_coloring_test.nconflicts(var, val, assignment) == 1
val = 'B'
assert map_coloring_test.nconflicts(var, val, assignment) == 0
def test_csp_actions():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
state = {'A': '1', 'B': '2', 'C': '3'}
assert map_coloring_test.actions(state) == []
state = {'A': '1', 'B': '3'}
assert map_coloring_test.actions(state) == [('C', '2')]
state = {'A': '1', 'C': '2'}
assert map_coloring_test.actions(state) == [('B', '3')]
state = (('A', '1'), ('B', '3'))
assert map_coloring_test.actions(state) == [('C', '2')]
state = {'A': '1'}
assert (map_coloring_test.actions(state) == [('C', '2'), ('C', '3')] or
map_coloring_test.actions(state) == [('B', '2'), ('B', '3')])
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
def test_csp_result():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
state = (('A', '1'), ('B', '3'))
action = ('C', '2')
assert map_coloring_test.result(state, action) == (('A', '1'), ('B', '3'), ('C', '2'))
def test_csp_goal_test():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
state = (('A', '1'), ('B', '3'), ('C', '2'))
assert map_coloring_test.goal_test(state) is True
state = (('A', '1'), ('C', '2'))
assert map_coloring_test.goal_test(state) is False
def test_csp_support_pruning():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
map_coloring_test.support_pruning()
assert map_coloring_test.curr_domains == {'A': ['1', '2', '3'], 'B': ['1', '2', '3'],
'C': ['1', '2', '3']}
def test_csp_suppose():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
var = 'A'
value = '1'
removals = map_coloring_test.suppose(var, value)
assert removals == [('A', '2'), ('A', '3')]
assert map_coloring_test.curr_domains == {'A': ['1'], 'B': ['1', '2', '3'],
'C': ['1', '2', '3']}
def test_csp_prune():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
removals = None
var = 'A'
value = '3'
map_coloring_test.support_pruning()
map_coloring_test.prune(var, value, removals)
assert map_coloring_test.curr_domains == {'A': ['1', '2'], 'B': ['1', '2', '3'],
'C': ['1', '2', '3']}
assert removals is None
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
removals = [('A', '2')]
map_coloring_test.support_pruning()
map_coloring_test.prune(var, value, removals)
assert map_coloring_test.curr_domains == {'A': ['1', '2'], 'B': ['1', '2', '3'],
'C': ['1', '2', '3']}
assert removals == [('A', '2'), ('A', '3')]
def test_csp_choices():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
var = 'A'
assert map_coloring_test.choices(var) == ['1', '2', '3']
map_coloring_test.support_pruning()
removals = None
value = '3'
map_coloring_test.prune(var, value, removals)
assert map_coloring_test.choices(var) == ['1', '2']
def test_csp_infer_assignement():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
map_coloring_test.infer_assignment() == {}
var = 'A'
value = '3'
map_coloring_test.prune(var, value, None)
value = '1'
map_coloring_test.prune(var, value, None)
map_coloring_test.infer_assignment() == {'A': '2'}
def test_csp_restore():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
map_coloring_test.curr_domains = {'A': ['2', '3'], 'B': ['1'], 'C': ['2', '3']}
removals = [('A', '1'), ('B', '2'), ('B', '3')]
map_coloring_test.restore(removals)
assert map_coloring_test.curr_domains == {'A': ['2', '3', '1'], 'B': ['1', '2', '3'],
'C': ['2', '3']}
def test_csp_conflicted_vars():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
current = {}
var = 'A'
val = '1'
map_coloring_test.assign(var, val, current)
var = 'B'
val = '3'
map_coloring_test.assign(var, val, current)
var = 'C'
val = '3'
map_coloring_test.assign(var, val, current)
conflicted_vars = map_coloring_test.conflicted_vars(current)
assert (conflicted_vars == ['B', 'C'] or conflicted_vars == ['C', 'B'])
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
def test_revise():
neighbors = parse_neighbors('A: B; B: ')
domains = {'A': [0], 'B': [4]}
constraints = lambda X, x, Y, y: x % 2 == 0 and (x+y) == 4
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
csp.support_pruning()
Xi = 'A'
Xj = 'B'
removals = []
assert revise(csp, Xi, Xj, removals) is False
assert len(removals) == 0
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4]}
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
csp.support_pruning()
assert revise(csp, Xi, Xj, removals) is True
assert removals == [('A', 1), ('A', 3)]
def test_AC3():
neighbors = parse_neighbors('A: B; B: ')
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4]}
constraints = lambda X, x, Y, y: x % 2 == 0 and (x+y) == 4 and y % 2 != 0
removals = []
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assert AC3(csp, removals=removals) is False
constraints = lambda X, x, Y, y: (x % 2) == 0 and (x+y) == 4
removals = []
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assert AC3(csp, removals=removals) is True
assert (removals == [('A', 1), ('A', 3), ('B', 1), ('B', 3)] or
removals == [('B', 1), ('B', 3), ('A', 1), ('A', 3)])
def test_first_unassigned_variable():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
assignment = {'A': '1', 'B': '2'}
assert first_unassigned_variable(assignment, map_coloring_test) == 'C'
assignment = {'B': '1'}
assert (first_unassigned_variable(assignment, map_coloring_test) == 'A' or
first_unassigned_variable(assignment, map_coloring_test) == 'C')
def test_num_legal_values():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
map_coloring_test.support_pruning()
var = 'A'
assignment = {}
assert num_legal_values(map_coloring_test, var, assignment) == 3
map_coloring_test = MapColoringCSP(list('RGB'), 'A: B C; B: C; C: ')
assignment = {'A': 'R', 'B': 'G'}
var = 'C'
assert num_legal_values(map_coloring_test, var, assignment) == 1
def test_mrv():
neighbors = parse_neighbors('A: B; B: C; C: ')
domains = {'A': [0, 1, 2, 3, 4], 'B': [4], 'C': [0, 1, 2, 3, 4]}
constraints = lambda X, x, Y, y: x % 2 == 0 and (x+y) == 4
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assignment = {'A': 0}
assert mrv(assignment, csp) == 'B'
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4], 'C': [0, 1, 2, 3, 4]}
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assert (mrv(assignment, csp) == 'B' or
mrv(assignment, csp) == 'C')
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 5, 6], 'C': [0, 1, 2, 3, 4]}
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
csp.support_pruning()
assert mrv(assignment, csp) == 'C'
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
def test_unordered_domain_values():
map_coloring_test = MapColoringCSP(list('123'), 'A: B C; B: C; C: ')
assignment = None
assert unordered_domain_values('A', assignment, map_coloring_test) == ['1', '2', '3']
def test_lcv():
neighbors = parse_neighbors('A: B; B: C; C: ')
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 5], 'C': [0, 1, 2, 3, 4]}
constraints = lambda X, x, Y, y: x % 2 == 0 and (x+y) == 4
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assignment = {'A': 0}
var = 'B'
assert lcv(var, assignment, csp) == [4, 0, 1, 2, 3, 5]
assignment = {'A': 1, 'C': 3}
constraints = lambda X, x, Y, y: (x + y) % 2 == 0 and (x + y) < 5
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
assert lcv(var, assignment, csp) == [1, 3, 0, 2, 4, 5]
def test_forward_checking():
neighbors = parse_neighbors('A: B; B: C; C: ')
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 5], 'C': [0, 1, 2, 3, 4]}
constraints = lambda X, x, Y, y: (x + y) % 2 == 0 and (x + y) < 8
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
csp.support_pruning()
A_curr_domains = csp.curr_domains['A']
C_curr_domains = csp.curr_domains['C']
var = 'B'
value = 3
assignment = {'A': 1, 'C': '3'}
assert forward_checking(csp, var, value, assignment, None) == True
assert csp.curr_domains['A'] == A_curr_domains
assert csp.curr_domains['C'] == C_curr_domains
assignment = {'C': 3}
assert forward_checking(csp, var, value, assignment, None) == True
assert csp.curr_domains['A'] == [1, 3]
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
csp.support_pruning()
assignment = {}
assert forward_checking(csp, var, value, assignment, None) == True
assert csp.curr_domains['A'] == [1, 3]
assert csp.curr_domains['C'] == [1, 3]
csp = CSP(variables=None, domains=domains, neighbors=neighbors, constraints=constraints)
domains = {'A': [0, 1, 2, 3, 4], 'B': [0, 1, 2, 3, 4, 7], 'C': [0, 1, 2, 3, 4]}
csp.support_pruning()
value = 7
assignment = {}
assert forward_checking(csp, var, value, assignment, None) == False
assert (csp.curr_domains['A'] == [] or csp.curr_domains['C'] == [])
def test_backtracking_search():
assert backtracking_search(australia)
assert backtracking_search(australia, select_unassigned_variable=mrv)
assert backtracking_search(australia, order_domain_values=lcv)
assert backtracking_search(australia, select_unassigned_variable=mrv,
order_domain_values=lcv)
assert backtracking_search(australia, inference=forward_checking)
assert backtracking_search(australia, inference=mac)
assert backtracking_search(usa, select_unassigned_variable=mrv,
order_domain_values=lcv, inference=mac)
def test_universal_dict():
d = UniversalDict(42)
assert d['life'] == 42
def test_parse_neighbours():
assert parse_neighbors('X: Y Z; Y: Z') == {'Y': ['X', 'Z'], 'X': ['Y', 'Z'], 'Z': ['X', 'Y']}
def test_topological_sort():
root = 'NT'
Sort, Parents = topological_sort(australia,root)
assert Sort == ['NT','SA','Q','NSW','V','WA']
assert Parents['NT'] == None
assert Parents['SA'] == 'NT'
assert Parents['Q'] == 'SA'
assert Parents['NSW'] == 'Q'
assert Parents['V'] == 'NSW'
assert Parents['WA'] == 'SA'
def test_tree_csp_solver():
australia_small = MapColoringCSP(list('RB'),
'NT: WA Q; NSW: Q V')
tcs = tree_csp_solver(australia_small)
assert (tcs['NT'] == 'R' and tcs['WA'] == 'B' and tcs['Q'] == 'B' and tcs['NSW'] == 'R' and tcs['V'] == 'B') or \
(tcs['NT'] == 'B' and tcs['WA'] == 'R' and tcs['Q'] == 'R' and tcs['NSW'] == 'B' and tcs['V'] == 'R')
if __name__ == "__main__":
pytest.main()