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poquet
schulze
Commits
684efe67
Commit
684efe67
authored
1 year ago
by
Millian Poquet
Browse files
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code: ratio link strength implem + test
parent
6e52f54a
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2 changed files
elect.py
+17
-6
17 additions, 6 deletions
elect.py
test_schulze_examples.py
+32
-16
32 additions, 16 deletions
test_schulze_examples.py
with
49 additions
and
22 deletions
elect.py
+
17
−
6
View file @
684efe67
...
...
@@ -39,13 +39,24 @@ def weak_condorcet_winners(n, candidates):
return
weak_winners
# As defined in section 4 https://citizensassembly.arts.ubc.ca/resources/submissions/csharman-10_0409201706-143.pdf
def
schulze_winners
(
n
,
candidates
):
# + other link strength methods defined in https://arxiv.org/pdf/1804.02973.pdf
def
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
):
nb_candidates
=
len
(
candidates
)
p
=
np
.
zeros
((
nb_candidates
,
nb_candidates
),
dtype
=
np
.
int8
)
for
i
in
range
(
nb_candidates
):
for
j
in
range
(
nb_candidates
):
if
i
!=
j
:
p
[
i
][
j
]
=
n
[
i
][
j
]
-
n
[
j
][
i
]
if
link_strength_method
==
'
margin
'
:
p
=
np
.
zeros
((
nb_candidates
,
nb_candidates
),
dtype
=
np
.
int8
)
for
i
in
range
(
nb_candidates
):
for
j
in
range
(
nb_candidates
):
if
i
!=
j
:
p
[
i
][
j
]
=
n
[
i
][
j
]
-
n
[
j
][
i
]
elif
link_strength_method
==
'
ratio
'
:
p
=
np
.
ones
((
nb_candidates
,
nb_candidates
),
dtype
=
np
.
int8
)
*
np
.
Inf
for
i
in
range
(
nb_candidates
):
for
j
in
range
(
nb_candidates
):
if
i
!=
j
and
n
[
j
][
i
]
>
0
:
p
[
i
][
j
]
=
n
[
i
][
j
]
/
n
[
j
][
i
]
else
:
raise
ValueError
(
f
"
link_strength_method
'
{
link_strength_method
}
'
is not implemented
"
)
for
i
in
range
(
nb_candidates
):
for
j
in
range
(
nb_candidates
):
...
...
This diff is collapsed.
Click to expand it.
test_schulze_examples.py
+
32
−
16
View file @
684efe67
...
...
@@ -27,7 +27,8 @@ def test_example1():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
d
'
]
def
test_example2
():
...
...
@@ -50,7 +51,8 @@ def test_example2():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
c
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
c
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
c
'
]
def
test_example3
():
...
...
@@ -77,7 +79,8 @@ def test_example3():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
e
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
e
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
e
'
]
def
test_example4
():
...
...
@@ -99,7 +102,8 @@ def test_example4():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
b
'
,
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
b
'
,
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
b
'
,
'
d
'
]
def
test_example5
():
...
...
@@ -122,7 +126,8 @@ def test_example5():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
d
'
]
def
test_example6
():
...
...
@@ -147,7 +152,8 @@ def test_example6():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
,
'
c
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
,
'
c
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
a
'
,
'
c
'
]
def
test_example7
():
# situation 1
...
...
@@ -174,7 +180,8 @@ def test_example7():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
a
'
]
# situation 2
candidates
=
[
'
a
'
,
'
b
'
,
'
c
'
,
'
d
'
,
'
e
'
,
'
f
'
]
...
...
@@ -194,7 +201,8 @@ def test_example7():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
d
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
d
'
]
def
test_example8
():
...
...
@@ -222,7 +230,8 @@ def test_example8():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
a
'
]
# situation 2
candidates
=
[
'
a
'
,
'
b
'
,
'
c
'
,
'
d
'
,
'
e
'
]
...
...
@@ -249,7 +258,8 @@ def test_example8():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
b
'
]
def
test_example9
():
...
...
@@ -272,7 +282,8 @@ def test_example9():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
a
'
]
# situation 2
candidates
=
[
'
a
'
,
'
b
'
,
'
c
'
,
'
d
'
,
'
e
'
]
...
...
@@ -294,7 +305,8 @@ def test_example9():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
b
'
]
def
test_example10
():
candidates
=
[
'
a
'
,
'
b
'
,
'
c
'
,
'
d
'
]
...
...
@@ -323,7 +335,8 @@ def test_example10():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
b
'
]
#assert False, "TODO: implement other methods to compute strength of link"
...
...
@@ -352,7 +365,8 @@ def test_example11():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
b
'
]
def
test_example12
():
...
...
@@ -379,7 +393,8 @@ def test_example12():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
e
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
e
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
e
'
]
def
test_example13
():
...
...
@@ -399,4 +414,5 @@ def test_example13():
assert
elect
.
condorcet_winner
(
n
,
candidates
)
is
None
assert
len
(
elect
.
weak_condorcet_winners
(
n
,
candidates
))
==
0
assert
elect
.
schulze_winners
(
n
,
candidates
)
==
[
'
a
'
,
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
margin
'
)
==
[
'
a
'
,
'
b
'
]
assert
elect
.
schulze_winners
(
n
,
candidates
,
link_strength_method
=
'
ratio
'
)
==
[
'
a
'
,
'
b
'
]
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