def test_fit_transform_auto_early_stop():
"""Test the fit and transform routine with auto ratio with a static number
of subsets."""
# Define the ratio parameter
ratio = 'auto'
n_subset = 4
# Create the sampling object
bc = BalanceCascade(ratio=ratio,
random_state=RND_SEED,
return_indices=True,
n_max_subset=n_subset)
# Get the different subset
X_resampled, y_resampled, idx_under = bc.fit_transform(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'bc_x_n_sub.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'bc_y_n_sub.npy'))
idx_gt = np.load(os.path.join(currdir, 'data', 'bc_idx_n_sub.npy'))
# Check each array
for idx in range(X_gt.size):
assert_array_equal(X_resampled[idx], X_gt[idx])
assert_array_equal(y_resampled[idx], y_gt[idx])
assert_array_equal(idx_under[idx], idx_gt[idx])
def test_fit_transform_auto_gradient_boosting():
"""Test the fit and transform routine with auto ratio with a gradient
boosting."""
# Define the ratio parameter
ratio = 'auto'
classifier = 'gradient-boosting'
# Create the sampling object
bc = BalanceCascade(ratio=ratio,
random_state=RND_SEED,
return_indices=True,
classifier=classifier)
# Get the different subset
X_resampled, y_resampled, idx_under = bc.fit_transform(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'bc_x_gb.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'bc_y_gb.npy'))
idx_gt = np.load(os.path.join(currdir, 'data', 'bc_idx_gb.npy'))
# Check each array
for idx in range(X_gt.size):
assert_array_equal(X_resampled[idx], X_gt[idx])
assert_array_equal(y_resampled[idx], y_gt[idx])
assert_array_equal(idx_under[idx], idx_gt[idx])
def test_fit_transform_half():
"""Test the fit and transform routine with 0.5 ratio."""
# Define the ratio parameter
ratio = 0.5
# Create the sampling object
bc = BalanceCascade(ratio=ratio, random_state=RND_SEED)
# Get the different subset
X_resampled, y_resampled = bc.fit_transform(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'bc_x_05.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'bc_y_05.npy'))
# Check each array
for idx in range(X_gt.size):
assert_array_equal(X_resampled[idx], X_gt[idx])
assert_array_equal(y_resampled[idx], y_gt[idx])
def test_fit_transform_half():
"""Test the fit and transform routine with 0.5 ratio."""
# Define the ratio parameter
ratio = 0.5
# Create the sampling object
bc = BalanceCascade(ratio=ratio, random_state=RND_SEED)
# Get the different subset
X_resampled, y_resampled = bc.fit_transform(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'bc_x_05.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'bc_y_05.npy'))
# Check each array
for idx in range(X_gt.size):
assert_array_equal(X_resampled[idx], X_gt[idx])
assert_array_equal(y_resampled[idx], y_gt[idx])
def test_fit_transform_auto():
"""Test the fit and transform routine with auto ratio."""
# Define the ratio parameter
ratio = 'auto'
# Create the sampling object
bc = BalanceCascade(ratio=ratio, random_state=RND_SEED,
return_indices=True)
# Get the different subset
X_resampled, y_resampled, idx_under = bc.fit_transform(X, Y)
currdir = os.path.dirname(os.path.abspath(__file__))
X_gt = np.load(os.path.join(currdir, 'data', 'bc_x.npy'))
y_gt = np.load(os.path.join(currdir, 'data', 'bc_y.npy'))
idx_gt = np.load(os.path.join(currdir, 'data', 'bc_idx.npy'))
# Check each array
for idx in range(X_gt.size):
assert_array_equal(X_resampled[idx], X_gt[idx])
assert_array_equal(y_resampled[idx], y_gt[idx])
assert_array_equal(idx_under[idx], idx_gt[idx])
from unbalanced_dataset.ensemble import BalanceCascade
# Generate the dataset
X, y = make_classification(n_classes=2, class_sep=2, weights=[0.1, 0.9],
n_informative=3, n_redundant=1, flip_y=0,
n_features=20, n_clusters_per_class=1,
n_samples=5000, random_state=10)
# Instanciate a PCA object for the sake of easy visualisation
pca = PCA(n_components=2)
# Fit and transform x to visualise inside a 2D feature space
X_vis = pca.fit_transform(X)
# Apply the random under-sampling
bc = BalanceCascade()
X_resampled, y_resampled = bc.fit_transform(X, y)
X_res_vis = []
for X_res in X_resampled:
X_res_vis.append(pca.transform(X_res))
# Two subplots, unpack the axes array immediately
f, (ax1, ax2) = plt.subplots(1, 2)
ax1.scatter(X_vis[y == 0, 0], X_vis[y == 0, 1], label="Class #0", alpha=0.5,
edgecolor=almost_black, facecolor=palette[0], linewidth=0.15)
ax1.scatter(X_vis[y == 1, 0], X_vis[y == 1, 1], label="Class #1", alpha=0.5,
edgecolor=almost_black, facecolor=palette[2], linewidth=0.15)
ax1.set_title('Original set')
ax2.scatter(X_vis[y == 0, 0], X_vis[y == 0, 1], label="Class #0", alpha=0.5,
edgecolor=almost_black, facecolor=palette[0], linewidth=0.15)