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from scipy import stats
import numpy as np
from numpy.testing import assert_almost_equal, assert_
def test_kde_1d():
#some basic tests comparing to normal distribution
np.random.seed(8765678)
n_basesample = 500
xn = np.random.randn(n_basesample)
xnmean = xn.mean()
xnstd = xn.std(ddof=1)
# get kde for original sample
gkde = stats.gaussian_kde(xn)
# evaluate the density funtion for the kde for some points
xs = np.linspace(-7,7,501)
kdepdf = gkde.evaluate(xs)
normpdf = stats.norm.pdf(xs, loc=xnmean, scale=xnstd)
intervall = xs[1] - xs[0]
assert_(np.sum((kdepdf - normpdf)**2)*intervall < 0.01)
prob1 = gkde.integrate_box_1d(xnmean, np.inf)
prob2 = gkde.integrate_box_1d(-np.inf, xnmean)
assert_almost_equal(prob1, 0.5, decimal=1)
assert_almost_equal(prob2, 0.5, decimal=1)
assert_almost_equal(gkde.integrate_box(xnmean, np.inf), prob1, decimal=13)
assert_almost_equal(gkde.integrate_box(-np.inf, xnmean), prob2, decimal=13)
assert_almost_equal(gkde.integrate_kde(gkde),
(kdepdf**2).sum()*intervall, decimal=2)
assert_almost_equal(gkde.integrate_gaussian(xnmean, xnstd**2),
(kdepdf*normpdf).sum()*intervall, decimal=2)
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