def test_cobweb_ifit():
tree = CobwebTree()
tree.ifit({'a': 'b'})
assert tree.root.count == 1
assert len(tree.root.children) == 0
assert 'a' in tree.root.av_counts
assert 'b' in tree.root.av_counts['a']
def test_cobweb_clear():
tree = CobwebTree()
tree.ifit({'a': 'b'})
tree.clear()
assert tree.root.count == 0
assert isinstance(tree.root, CobwebNode)
assert tree == tree.root.tree
def test_cobweb():
tree = CobwebTree()
for i in range(40):
data = {}
data['a1'] = random.choice(['v1', 'v2', 'v3', 'v4'])
data['a2'] = random.choice(['v1', 'v2', 'v3', 'v4'])
tree.ifit(data)
verify_counts(tree.root)
def test_cobweb_sanity_check():
tree = CobwebTree()
with pytest.raises(ValueError):
tree._sanity_check_instance([set()])
with pytest.raises(ValueError):
tree._sanity_check_instance({1: 'a'})
with pytest.raises(ValueError):
tree._sanity_check_instance({'a': set([])})
with pytest.raises(ValueError):
tree._sanity_check_instance({'a': None})
from concept_formation.examples.examples_utils import avg_lines
from concept_formation.evaluation import incremental_evaluation
from concept_formation.cobweb import CobwebTree
from concept_formation.dummy import DummyTree
from concept_formation.datasets import load_mushroom
num_runs = 30
num_examples = 30
mushrooms = load_mushroom()
naive_data = incremental_evaluation(DummyTree(),
mushrooms,
run_length=num_examples,
runs=num_runs,
attr="classification")
cobweb_data = incremental_evaluation(CobwebTree(),
mushrooms,
run_length=num_examples,
runs=num_runs,
attr="classification")
cobweb_x, cobweb_y = [], []
naive_x, naive_y = [], []
for opp in range(len(cobweb_data[0])):
for run in range(len(cobweb_data)):
cobweb_x.append(opp)
cobweb_y.append(cobweb_data[run][opp])
for opp in range(len(naive_data[0])):
for run in range(len(naive_data)):
# Add noise to targets
y[::5] += 1 * (0.5 - np.random.rand(8))
y2[::5] += 1 * (0.5 - np.random.rand(8))
# Create dictionaries
# Note that the y value is stored as a hidden variable because
# in this case we only want to use the X value to make predictions.
training_data = [{'X': v[0], '_y': y[i]} for i, v in enumerate(X)]
shuffle(training_data)
# Build test data
test_data = [{'X': v[0]} for i, v in enumerate(T)]
#test_data = [{'X': float(v)} for i,v in enumerate(X)]
# Fit cobweb models
cbt = CobwebTree()
cb3t = Cobweb3Tree()
cbt.fit(training_data, iterations=1)
cb3t.fit(training_data, iterations=1)
print(cb3t.root)
child = cb3t.categorize({'X': 4.16})
print(child.predict('X'))
print(child.predict('y'))
curr = child
print(curr)
while curr.parent is not None:
curr = curr.parent
print(curr)
import matplotlib.pyplot as plt
from sklearn.decomposition import PCA
from sklearn.feature_extraction import DictVectorizer
from sklearn.metrics import adjusted_rand_score
from concept_formation.cobweb import CobwebTree
from concept_formation.cluster import cluster
from concept_formation.datasets import load_mushroom
seed(0)
mushrooms = load_mushroom()
shuffle(mushrooms)
mushrooms = mushrooms[:150]
tree = CobwebTree()
mushrooms_no_class = [{
a: mushroom[a]
for a in mushroom if a != 'classification'
} for mushroom in mushrooms]
clusters = cluster(tree, mushrooms_no_class)[0]
mushroom_class = [
mushroom[a] for mushroom in mushrooms for a in mushroom
if a == 'classification'
]
ari = adjusted_rand_score(clusters, mushroom_class)
dv = DictVectorizer(sparse=False)
mushroom_X = dv.fit_transform(mushrooms_no_class)
pca = PCA(n_components=2)
def test_cobweb_str():
tree = CobwebTree()
assert str(tree) == str(tree.root)
def test_cobweb_init():
tree = CobwebTree()
assert isinstance(tree.root, CobwebNode)
assert tree == tree.root.tree
def test_empty_instance():
t = CobwebTree()
t.ifit({'x': 1})
t.ifit({'x': 2})
t.categorize({})
def test_cobweb_fit():
tree = CobwebTree()
tree2 = CobwebTree()
examples = [{'a': 'a'}, {'b': 'b'}, {'c': 'c'}]
tree.fit(examples)
tree2.fit(examples)