def test_iris(self):
num_constraints = 1500
n = self.iris_points.shape[0]
W = SDML.prepare_constraints(self.iris_labels, n, num_constraints)
sdml = SDML(self.iris_points, W)
sdml.fit()
csep = class_separation(sdml.transform(), self.iris_labels)
self.assertLess(csep, 0.25)
def sandwich_demo():
x, y = sandwich_data()
knn = nearest_neighbors(x, k=2)
ax = pyplot.subplot(3, 1, 1) # take the whole top row
plot_sandwich_data(x, y, ax)
plot_neighborhood_graph(x, knn, y, ax)
ax.set_title('input space')
ax.set_aspect('equal')
ax.set_xticks([])
ax.set_yticks([])
num_constraints = 60
mls = [
LMNN(x, y),
ITML(x, ITML.prepare_constraints(y, len(x), num_constraints)),
SDML(x, SDML.prepare_constraints(y, len(x), num_constraints)),
LSML(x, LSML.prepare_constraints(y, num_constraints))
]
for ax_num, ml in zip(xrange(3,7), mls):
ml.fit()
tx = ml.transform()
ml_knn = nearest_neighbors(tx, k=2)
ax = pyplot.subplot(3,2,ax_num)
plot_sandwich_data(tx, y, ax)
plot_neighborhood_graph(tx, ml_knn, y, ax)
ax.set_title('%s space' % ml.__class__.__name__)
ax.set_xticks([])
ax.set_yticks([])
pyplot.show()