def test_invalid_reason_can_be_setted_and_getted():
""" Test that invalid reasons can be set and accessed on a split instance """
split = CHAID.Split("a", None, None, 1, 0)
reason = CHAID.InvalidSplitReason.ALPHA_MERGE
split.invalid_reason = reason
assert split.invalid_reason == reason, 'Splits should be able to store invalid reasons'
def setUp(self):
invalid_split = CHAID.Split(None, None, 0, 1, 0)
self.tree = CHAID.Tree.from_numpy(np.array([[1]]), np.array([1]))
self.tree._tree_store = [
CHAID.Node(node_id=0,
split=CHAID.Split('a', [[1], [2]], 1, 0.2, 2)),
CHAID.Node(node_id=1, split=invalid_split, choices=[1], parent=0),
CHAID.Node(node_id=2,
split=CHAID.Split('c', [[3]], 1, 0.2, 2),
choices=[2],
parent=0)
]
self.last_node = CHAID.Node(node_id=3,
split=invalid_split,
choices=[3],
parent=2)
self.tree._tree_store.append(self.last_node)
def test_node_should_have_a_score():
"""
Tests that node uses the split score and is called 'score'
"""
data = np.array([1.3, 23.0, 3.0, 3.0, 12.4])
continuous_dp = CHAID.ContinuousColumn(data)
split = CHAID.Split("a", [], 2, 3, 4)
node = CHAID.Node(dep_v=continuous_dp, split=split)
assert node.score == 2
def test_column_name_mappings():
""" Test column name mappings are applied correctly """
column_names = ["a", "b", "c"]
cols = range(0, len(column_names))
splits = [CHAID.Split(col, None, None, 1, 0) for col in cols]
for split in splits:
assert split.column == str(split.column_id), 'Names should be column id when mapping not applied'
split.name_columns(column_names)
assert split.column == column_names[split.column_id], 'Names should correctly map to column name when mapping is applied'
def test_invalid_split():
""" Test properties when split invalid """
split = CHAID.Split(None, None, None, 1, 0)
assert split.invalid_reason == None
assert split.column == None