def test_cluster_between_regions_2(self):
""" Tests that DBSCAN can find clusters between regions. """
x = np.array([[0, 0], [0.6, 0], [0.9, 0], [1.1, 0.2], [0.9, 0.6],
[1.1, 0.8], [1.4, 0.8], [2, 2]])
ds_x = ds.array(x, block_size=(5, 2))
dbscan = DBSCAN(n_regions=2, eps=0.5, min_samples=3)
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 1)
def test_small_cluster_2(self):
""" Tests that DBSCAN can find clusters with less than min_samples. """
x = np.array([[0, 0], [0, 1], [1, 0], [3, 0], [5.1, 0], [6, 0], [6, 1],
[10, 10]])
ds_x = ds.array(x, block_size=(5, 2))
# n_regions=10
dbscan2 = DBSCAN(n_regions=10, eps=2.5, min_samples=4)
dbscan2.fit(ds_x)
self.assertEqual(dbscan2.n_clusters, 2)
def test_cluster_between_regions_1(self):
""" Tests that DBSCAN can find clusters between regions. """
x = np.array([[0, 0], [3.9, 0], [4.1, 0], [4.1, 0.89], [4.1, 0.88],
[5.9, 0], [5.9, 0.89], [5.9, 0.88], [6.1, 0], [10, 10],
[4.6, 0], [5.4, 0]])
ds_x = ds.array(x, block_size=(5, 2))
dbscan = DBSCAN(n_regions=10, eps=0.9, min_samples=4)
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 1)
def test_zero_samples(self):
""" Tests DBSCAN fit when some regions contain zero samples.
"""
n_samples = 2
x, y = make_blobs(n_samples=n_samples, n_features=2, random_state=8)
dbscan = DBSCAN(n_regions=3, eps=.2, max_samples=100)
x = StandardScaler().fit_transform(x)
ds_x = ds.array(x, block_size=(2, 2))
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 0)
def test_random_clusters_2(self):
""" Tests DBSCAN on random data with multiple clusters. """
# 2 dimensions
np.random.seed(2)
x = np.random.uniform(0, 10, size=(1000, 2))
ds_x = ds.array(x, block_size=(300, 2))
dbscan = DBSCAN(n_regions=10, max_samples=10, eps=0.5, min_samples=10)
y = dbscan.fit_predict(ds_x).collect()
self.assertEqual(dbscan.n_clusters, 27)
self.assertEqual(np.count_nonzero(y == -1), 206)
def test_n_clusters_moons_grid(self):
""" Tests that DBSCAN finds the correct number of clusters when
setting n_regions > 1 with moon data.
"""
n_samples = 1500
x, y = make_moons(n_samples=n_samples, noise=.05)
dbscan = DBSCAN(n_regions=4, eps=.3, max_samples=600)
x = StandardScaler().fit_transform(x)
ds_x = ds.array(x, block_size=(300, 2))
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 2)
def test_n_clusters_blobs_grid(self):
""" Tests that DBSCAN finds the correct number of clusters when
setting n_regions > 1 with blob data.
"""
n_samples = 1500
x, y = make_blobs(n_samples=n_samples, n_features=2, random_state=8)
dbscan = DBSCAN(n_regions=4, eps=.3, max_samples=300)
x = StandardScaler().fit_transform(x)
ds_x = ds.array(x, block_size=(300, 2))
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 3)
def test_n_clusters_circles_max_samples(self):
""" Tests that DBSCAN finds the correct number of clusters when
defining max_samples with circle data.
"""
n_samples = 1500
x, y = make_circles(n_samples=n_samples, factor=.5, noise=.05)
dbscan = DBSCAN(n_regions=1, eps=.15, max_samples=500)
x = StandardScaler().fit_transform(x)
ds_x = ds.array(x, block_size=(300, 2))
dbscan.fit(ds_x)
self.assertEqual(dbscan.n_clusters, 2)
def test_random_clusters_3(self):
""" Tests DBSCAN on random data with multiple clusters. """
# 3 dimensions
np.random.seed(3)
x = np.random.uniform(0, 10, size=(1000, 3))
ds_x = ds.array(x, block_size=(300, 3))
dbscan = DBSCAN(n_regions=10,
dimensions=[0, 1],
eps=0.9,
min_samples=4)
y = dbscan.fit_predict(ds_x).collect()
self.assertEqual(dbscan.n_clusters, 50)
self.assertEqual(np.count_nonzero(y == -1), 266)
def main():
data = ds.load_txt_file("/gpfs/projects/bsc19/COMPSs_DATASETS/dislib/gaia"
"/dbscan/data_scaled.csv", block_size=(10000, 5))
dbscan = DBSCAN(eps=0.19, min_samples=5, max_samples=5000, n_regions=17,
dimensions=[0, 1])
performance.measure("DBSCAN", "gaia", dbscan.fit, data)
def test_sparse(self):
""" Tests that DBSCAN produces the same results with sparse and
dense data.
"""
n_samples = 1500
x, y = make_blobs(n_samples=n_samples, random_state=170)
dbscan = DBSCAN(n_regions=1, eps=.15)
transformation = [[0.6, -0.6], [-0.4, 0.8]]
x = np.dot(x, transformation)
x = StandardScaler().fit_transform(x)
dense = ds.array(x, block_size=(300, 2))
sparse = ds.array(csr_matrix(x), block_size=(300, 2))
y_dense = dbscan.fit_predict(dense).collect()
y_sparse = dbscan.fit_predict(sparse).collect()
self.assertTrue(np.array_equal(y_dense, y_sparse))
def main():
file = "/fefs/scratch/bsc19/bsc19029/PERFORMANCE/datasets/data_scaled.csv"
data = ds.load_txt_file(file, block_size=(10000, 5))
dbscan = DBSCAN(eps=0.19,
min_samples=5,
max_samples=5000,
n_regions=17,
dimensions=[0, 1])
performance.measure("DBSCAN", "gaia", dbscan.fit, data)
def test_n_clusters_aniso_dimensions(self):
""" Tests that DBSCAN finds the correct number of clusters when
dimensions is not None.
"""
n_samples = 1500
x, y = make_blobs(n_samples=n_samples, random_state=170)
dbscan = DBSCAN(n_regions=5, dimensions=[1], eps=.15)
transformation = [[0.6, -0.6], [-0.4, 0.8]]
x = np.dot(x, transformation)
x = StandardScaler().fit_transform(x)
ds_x = ds.array(x, block_size=(300, 2))
y_pred = dbscan.fit_predict(ds_x).collect()
true_sizes = {19, 496, 491, 488, 6}
cluster_sizes = {
y_pred[y_pred == -1].size, y_pred[y_pred == 0].size,
y_pred[y_pred == 1].size, y_pred[y_pred == 2].size,
y_pred[y_pred == 3].size
}
self.assertEqual(dbscan.n_clusters, 4)
self.assertEqual(true_sizes, cluster_sizes)
def main():
np.random.seed(0)
# ============
# Generate datasets. We choose the size big enough to see the scalability
# of the algorithms, but not too big to avoid too long running times
# ============
n_samples = 1500
noisy_circles = make_circles(n_samples=n_samples,
factor=.5,
noise=.05,
random_state=170)
noisy_moons = make_moons(n_samples=n_samples, noise=.05)
blobs = make_blobs(n_samples=n_samples, random_state=8)
no_structure = np.random.rand(n_samples, 2), None
# Anisotropicly distributed data
random_state = 170
X, y = make_blobs(n_samples=n_samples, random_state=random_state)
transformation = [[0.6, -0.6], [-0.4, 0.8]]
X_aniso = np.dot(X, transformation)
aniso = (X_aniso, y)
# blobs with varied variances
varied = make_blobs(n_samples=n_samples,
cluster_std=[1.0, 2.5, 0.5],
random_state=random_state)
# ============
# Set up cluster parameters
# ============
plt.figure(figsize=(9 * 2 + 3, 12.5))
plt.subplots_adjust(left=.02,
right=.98,
bottom=.001,
top=.96,
wspace=.05,
hspace=.01)
plot_num = 1
default_base = {
'quantile': .3,
'eps': .3,
'damping': .9,
'preference': -200,
'n_neighbors': 10,
'n_clusters': 3
}
datasets = [(noisy_circles, {
'damping': .77,
'preference': -240,
'quantile': .2,
'n_clusters': 2
}), (noisy_moons, {
'damping': .75,
'preference': -220,
'n_clusters': 2
}), (varied, {
'eps': .18,
'n_neighbors': 2
}), (aniso, {
'eps': .15,
'n_neighbors': 2
}), (blobs, {}), (no_structure, {})]
for i_dataset, (dataset, algo_params) in enumerate(datasets):
# update parameters with dataset-specific values
params = default_base.copy()
params.update(algo_params)
X, y = dataset
# normalize dataset for easier parameter selection
X = StandardScaler().fit_transform(X)
# ============
# Create cluster objects
# ============
kmeans = KMeans(n_clusters=params["n_clusters"])
dbscan = DBSCAN(eps=params["eps"], n_regions=1)
gm = GaussianMixture(n_components=params["n_clusters"])
clustering_algorithms = (('K-Means', kmeans), ('DBSCAN', dbscan),
('Gaussian mixture', gm))
for name, algorithm in clustering_algorithms:
t0 = time.time()
# catch warnings related to kneighbors_graph
with warnings.catch_warnings():
warnings.filterwarnings("ignore",
message="the number of connected "
"components of the "
"connectivity matrix is ["
"0-9]{1,2} > 1. Completing "
"it to avoid stopping the "
"tree early.",
category=UserWarning)
warnings.filterwarnings("ignore",
message="Graph is not fully "
"connected, "
"spectral "
"embedding may not "
"work as "
"expected.",
category=UserWarning)
data = ds.array(X, block_size=(300, 2))
algorithm.fit(data)
t1 = time.time()
y_pred = algorithm.fit_predict(data).collect()
plt.subplot(len(datasets), len(clustering_algorithms), plot_num)
if i_dataset == 0:
plt.title(name, size=18)
colors = np.array(
list(
islice(
cycle([
'#377eb8', '#ff7f00', '#4daf4a', '#f781bf',
'#a65628', '#984ea3', '#999999', '#e41a1c',
'#dede00'
]), int(max(y_pred) + 1))))
# add black color for outliers (if any)
colors = np.append(colors, ["#000000"])
plt.scatter(X[:, 0], X[:, 1], s=10, color=colors[y_pred])
plt.xlim(-2.5, 2.5)
plt.ylim(-2.5, 2.5)
plt.xticks(())
plt.yticks(())
plt.text(.99,
.01, ('%.2fs' % (t1 - t0)).lstrip('0'),
transform=plt.gca().transAxes,
size=15,
horizontalalignment='right')
plot_num += 1
plt.show()
def initialize(alg_names, args):
return [{
'KMeans': lambda x: KMeans(**get_kmeans_kwargs(x)),
'DBSCAN': lambda x: DBSCAN(**get_dbscan_kwargs(x)),
'GaussianMixture': lambda x: GaussianMixture(**get_gm_kwargs(x))
}[name](args) for name in alg_names]
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--svmlight",
help="read file in SVMlLight format",
action="store_true")
parser.add_argument("-dt",
"--detailed_times",
help="get detailed execution times (read and fit)",
action="store_true")
parser.add_argument("-e",
"--epsilon",
metavar="EPSILON",
type=float,
help="default is 0.5",
default=0.5)
parser.add_argument("-r",
"--regions",
metavar="N_REGIONS",
type=int,
help="number of regions to create",
default=1)
parser.add_argument("-d",
"--dimensions",
metavar="DIMENSIONS",
type=str,
help="comma separated dimensions to use in the grid",
required=False)
parser.add_argument("-x",
"--max_samples",
metavar="MAX_SAMPLES",
type=int,
help="maximum samples to process per task ("
"default is 1000)",
default=1000)
parser.add_argument("-m",
"--min_samples",
metavar="MIN_SAMPLES",
type=int,
help="default is 5",
default=5)
parser.add_argument("-b",
"--block_size",
metavar="BLOCK_SIZE",
type=str,
help="two comma separated ints that represent the "
"size of the blocks in which to divide the input "
"data (default is 100,100)",
default="100,100")
parser.add_argument("-f",
"--features",
metavar="N_FEATURES",
help="number of features of the input data "
"(only for SVMLight files)",
type=int,
default=None,
required=False)
parser.add_argument("--dense",
help="store data in dense format (only "
"for SVMLight files)",
action="store_true")
parser.add_argument("--labeled",
help="the last column of the input file "
"represents labels (only for text "
"files)",
action="store_true")
parser.add_argument("train_data",
help="input file in CSV or SVMLight format",
type=str)
args = parser.parse_args()
train_data = args.train_data
s_time = time.time()
read_time = 0
sparse = not args.dense
bsize = args.block_size.split(",")
block_size = (int(bsize[0]), int(bsize[1]))
if args.svmlight:
x, y = ds.load_svmlight_file(train_data, block_size, args.features,
sparse)
else:
x = ds.load_txt_file(train_data, block_size)
n_features = x.shape[1]
if args.labeled and not args.svmlight:
x = x[:, :n_features - 1]
if args.detailed_times:
compss_barrier()
read_time = time.time() - s_time
s_time = time.time()
dims = range(args.features)
if args.dimensions:
dims = args.dimensions.split(",")
dims = np.array(dims, dtype=int)
dbscan = DBSCAN(eps=args.epsilon,
min_samples=args.min_samples,
max_samples=args.max_samples,
n_regions=args.regions,
dimensions=dims)
dbscan.fit(x)
compss_barrier()
fit_time = time.time() - s_time
out = [
dbscan.eps, dbscan.min_samples, dbscan.max_samples, dbscan.n_regions,
len(dims), args.part_size, dbscan.n_clusters, read_time, fit_time
]
print(out)
