def test_matrix_one_iteration_single_linkage(self):
"""
Tests clustering using one iteration.
Using the following input data:
│ │ 3 │ 5 │ 8 │ 12 │ 18 │
├───┼───┼───┼───┼────┼────┤
│ 3│ │ 2 │ 5 │ 9 │ 15 │
│ 5│ │ │ 3 │ 7 │ 13 │
│ 8│ │ │ │ 4 │ 10 │
│ 12│ │ │ │ │ 6 │
│ 18│ │ │ │ │ │
We should get the following after one iteration:
│ │ 3 │ 8, 5 l=3 │ 12 │ 18 │
├───────────┼───┼──────────┼────┼────┤
│ 3 │ │ 2 │ 9 │ 15 │
│ 8, 5 l=3 │ │ │ 4 │ 10 │
│ 12 │ │ │ │ 6 │
│ 18 │ │ │ │ │
"""
data = [3, 5, 8, 12, 18]
result = matrix(matrix(data), linkage='single')
expected = {
((3, (8, 5)), 3),
((3, 12), 9),
((3, 18), 15),
(((8, 5), 12), 4),
(((8, 5), 18), 10),
((12, 18), 6),
}
self.assertTure(result, expected)
def test_matrix(self):
"""
Tests matrix generation at level 0.
At level 0 we don't care about the linkage as we don't compare clusters
yet.
Using [1, 2, 3, 4, 5] as input data, this should yield the following
distance matrix:
│ │ 1 │ 2 │ 3 │ 4 │ 5 │
├──┼───┼───┼───┼───┼───┤
│ 1│ │ 1 │ 2 │ 3 │ 4 │
│ 2│ │ │ 1 │ 2 │ 3 │
│ 3│ │ │ │ 1 │ 2 │
│ 4│ │ │ │ │ 1 │
│ 5│ │ │ │ │ │
The diagonal should be ignored, for this use-case.
"""
data = set([1, 2, 3, 4, 5])
result = matrix(data)
# In the result, we expect to have triples. Each triple consists of the
# two compared elements and the distance. The ordering of the first two
# elements should not matter, but in this test we *assume* one ordering,
# to make testing easier.
expected = {(1, 2, 1),
(1, 3, 2),
(1, 4, 3),
(1, 5, 4),
(2, 3, 1),
(2, 4, 2),
(2, 5, 3),
(3, 4, 1),
(3, 5, 2),
(4, 5, 1)}
self.assertEqual(result, expected)
