Localized Generalized Matrix Learning Vector Quantization

This example shows how LGMLVQ projects and classifies. The plot shows the target class of each data point (big circle) and which class was predicted (smaller circle). It also shows the prototypes (black diamond) and their labels (small point inside the diamond). The projected data is shown in the right plot.

Out:

LGMLVQ:
variance coverd by projection: 100.0
variance coverd by projection: 100.0
classification accuracy: 0.775

import matplotlib.pyplot as plt
import numpy as np

from sklearn_lvq import LgmlvqModel
from sklearn_lvq.utils import plot2d

print(__doc__)

nb_ppc = 100
toy_label = np.append(np.zeros(nb_ppc), np.ones(nb_ppc), axis=0)

print('LGMLVQ:')
toy_data = np.append(
    np.random.multivariate_normal([0, 1], np.array([[5, -4], [-4, 6]]),
                                  size=nb_ppc),
    np.random.multivariate_normal([0, 0], np.array([[5, 4], [4, 6]]),
                                  size=nb_ppc), axis=0)
lgmlvq = LgmlvqModel()
lgmlvq.fit(toy_data, toy_label)
plot2d(lgmlvq, toy_data, toy_label, 1, 'lgmlvq')

print('classification accuracy:', lgmlvq.score(toy_data, toy_label))
plt.show()