Generate an imbalanced dataset

An illustration of using the generate_imbalance_data() function to create an imbalanced dataset.

# Authors: Zhining Liu <zhining.liu@outlook.com>
# License: MIT

print(__doc__)

from imbens.datasets import generate_imbalance_data
from imbens.utils._plot import plot_2Dprojection_and_cardinality
from collections import Counter

Generate the dataset

X_train, X_test, y_train, y_test = generate_imbalance_data(
    n_samples=1000, weights=[.7,.2,.1], test_size=.5,
    kwargs={'n_informative': 3},
)

print ("Train class distribution: ", Counter(y_train))
print ("Test class distribution:  ", Counter(y_test))

Train class distribution:  Counter({0: 350, 1: 100, 2: 50})
Test class distribution:   Counter({0: 350, 1: 99, 2: 51})

Plot the generated (training) data

plot_2Dprojection_and_cardinality(X_train, y_train)

(<Figure size 1000x400 with 2 Axes>, (<AxesSubplot:title={'center':'Dataset (2D projection by KernelPCA)'}>, <AxesSubplot:title={'center':'Class Distribution'}, xlabel='Class'>))