def perform_mmd_test(train_miss_impute,
test_miss_impute,
train_full,
test_full,
alpha,
mmd_miss_impute=None,
mmd_full=None):
mmd_result = np.zeros(2)
sb_data_miss_impute = TSTData(train_miss_impute, test_miss_impute)
if mmd_miss_impute is None:
print('ini')
x, y = sb_data_miss_impute.xy()
dist_mat_miss_impute = metrics.pairwise_distances(x, y)
the_kernel = kernel.KGauss(dist_mat_miss_impute.std())
mmd_miss_impute = tst.QuadMMDTest(the_kernel, alpha=alpha)
test_result = mmd_miss_impute.perform_test(sb_data_miss_impute)
if test_result['h0_rejected']:
mmd_result[0] = 1
sb_data_full = TSTData(train_full, test_full)
if mmd_full is None:
x, y = sb_data_full.xy()
dist_mat_full = metrics.pairwise_distances(x, y)
the_kernel = kernel.KGauss(dist_mat_full.std())
mmd_full = tst.QuadMMDTest(the_kernel, alpha=alpha)
test_result = mmd_full.perform_test(sb_data_full)
if test_result['h0_rejected']:
mmd_result[1] = 1
return mmd_result, mmd_miss_impute, mmd_full
def perform_mmd_test(train_miss_impute,
test_miss_impute,
train_full,
test_full,
alpha,
mmd_miss_impute=None,
mmd_full=None):
mmd_result = np.zeros(2)
sb_data_miss_impute = TSTData(train_miss_impute, test_miss_impute)
if mmd_miss_impute is None:
print('ini')
the_kernel = kernel.KGauss(sb_data_miss_impute.mean_std())
mmd_miss_impute = tst.QuadMMDTest(the_kernel, alpha=alpha)
test_result = mmd_miss_impute.perform_test(sb_data_miss_impute)
if test_result['h0_rejected']:
mmd_result[0] = 1
sb_data_full = TSTData(train_full, test_full)
if mmd_full is None:
the_kernel = kernel.KGauss(sb_data_full.mean_std())
mmd_full = tst.QuadMMDTest(the_kernel, alpha=alpha)
test_result = mmd_full.perform_test(sb_data_full)
if test_result['h0_rejected']:
mmd_result[1] = 1
return mmd_result, mmd_miss_impute, mmd_full
def job_lin_mmd(sample_source, tr, te, r):
"""Linear mmd with grid search to choose the best Gaussian width."""
# should be completely deterministic
# If n is too large, pairwise meddian computation can cause a memory error.
with util.ContextTimer() as t:
X, Y = tr.xy()
Xr = X[:min(X.shape[0], 1000), :]
Yr = Y[:min(Y.shape[0], 1000), :]
med = util.meddistance(np.vstack((Xr, Yr)))
widths = [(med * f) for f in 2.0**np.linspace(-1, 4, 40)]
list_kernels = [kernel.KGauss(w**2) for w in widths]
# grid search to choose the best Gaussian width
besti, powers = tst.LinearMMDTest.grid_search_kernel(
tr, list_kernels, alpha)
# perform test
best_ker = list_kernels[besti]
lin_mmd_test = tst.LinearMMDTest(best_ker, alpha)
test_result = lin_mmd_test.perform_test(te)
result = {
'test_method': lin_mmd_test,
'test_result': test_result,
'time_secs': t.secs
}
return result
def job_quad_mmd_2U(sample_source, tr, te, r):
"""Quadratic mmd with grid search to choose the best Gaussian width.
Use two-sample U statistics to compute k(X,Y).
"""
# If n is too large, pairwise meddian computation can cause a memory error.
with util.ContextTimer() as t:
med = util.meddistance(tr.stack_xy(), 1000)
list_gwidth = np.hstack(((med**2) * (2.0**np.linspace(-4, 4, 40))))
list_gwidth.sort()
list_kernels = [kernel.KGauss(gw2) for gw2 in list_gwidth]
# grid search to choose the best Gaussian width
besti, powers = tst.QuadMMDTest.grid_search_kernel(
tr, list_kernels, alpha)
# perform test
best_ker = list_kernels[besti]
mmd_test = tst.QuadMMDTest(best_ker,
n_permute=1000,
alpha=alpha,
use_1sample_U=False)
test_result = mmd_test.perform_test(te)
result = {
'test_method': mmd_test,
'test_result': test_result,
'time_secs': t.secs
}
return result
def test_basic_H1(self):
"""
Nothing special. Just test basic things.
"""
seed = 12
# sample
n = 271
alpha = 0.01
for d in [1, 4]:
# h1 is true
ss = data.SSGaussMeanDiff(d=d, my=2.0)
dat = ss.sample(n, seed=seed)
xy = dat.stack_xy()
sig2 = util.meddistance(xy, subsample=1000)**2
k = kernel.KGauss(sig2)
# Test
for J in [1, 6]:
# random test locations
V = util.fit_gaussian_draw(xy, J, seed=seed + 1)
ume = tst.UMETest(V, k, n_simulate=2000, alpha=alpha)
tresult = ume.perform_test(dat)
# assertions
self.assertGreaterEqual(tresult['pvalue'], 0.0)
# H1 is true. Should reject with a small p-value
self.assertLessEqual(tresult['pvalue'], 0.1)
def test(self, X, Y):
XY = self.preprocess(X, Y)
locations = fot_tst.MeanEmbeddingTest.init_locs_subset(XY, self.J)
med = fot_util.meddistance(XY.stack_xy(), 1000)
kernel = fot_kernel.KGauss(med)
ME = fot_tst.MeanEmbeddingTest(locations, med, alpha=self.alpha)
result = ME.perform_test(XY)
p_val = result['pvalue']
return p_val
def test(self, X, Y):
XY = self.preprocess(X, Y)
med = fot_util.meddistance(XY.stack_xy(), 1000)
kernel = fot_kernel.KGauss(med)
MMD = fot_tst.QuadMMDTest(kernel,
n_permute=self.n_permute,
alpha=self.alpha)
result = MMD.perform_test(XY)
p_val = result['pvalue']
return p_val
def mmd(p, q, alpha=0.05):
if (p.ndim == 1): p = p[:, np.newaxis]
if (q.ndim == 1): q = q[:, np.newaxis]
d = data.TSTData(p, q)
d_tr, d_te = d.split_tr_te(tr_proportion=0.5)
med = util.meddistance(d_tr.stack_xy())
widths = [(med * f) for f in 2.0**np.linspace(-1, 4, 20)]
list_kernels = [kernel.KGauss(w**2) for w in widths]
besti, powers = tst.LinearMMDTest.grid_search_kernel(
d_tr, list_kernels, alpha)
best_ker = list_kernels[besti]
lin_mmd_test = tst.LinearMMDTest(best_ker, alpha)
r = lin_mmd_test.perform_test(d_te)
return r['test_stat'], r['pvalue']
def job_quad_mmd(sample_source, tr, te, r):
"""Quadratic mmd with grid search to choose the best Gaussian width."""
# If n is too large, pairwise meddian computation can cause a memory error.
med = util.meddistance(tr.stack_xy(), 1000)
list_gwidth = np.hstack( ( (med**2) *(2.0**np.linspace(-4, 4, 30) ) ) )
list_gwidth.sort()
list_kernels = [kernel.KGauss(gw2) for gw2 in list_gwidth]
# grid search to choose the best Gaussian width
besti, powers = tst.QuadMMDTest.grid_search_kernel(tr, list_kernels, alpha)
# perform test
best_ker = list_kernels[besti]
mmd_test = tst.QuadMMDTest(best_ker, n_permute=400, alpha=alpha)
test_result = mmd_test.perform_test(te)
return test_result
def test(self, X, Y):
XY = self.preprocess(X, Y)
train, test = XY.split_tr_te(tr_proportion=self.split_ratio)
med = fot_util.meddistance(train.stack_xy(), 1000)
bandwidths = (med**2) * (2.**np.linspace(-4, 4, 20))
kernels = [fot_kernel.KGauss(width) for width in bandwidths]
with contextlib.redirect_stdout(None):
best_i, powers = fot_tst.QuadMMDTest.grid_search_kernel(
train, kernels, alpha=self.alpha)
best_kernel = kernels[best_i]
MMD = fot_tst.QuadMMDTest(best_kernel,
n_permute=self.n_permute,
alpha=self.alpha)
result = MMD.perform_test(test)
p_val = result['pvalue']
return p_val
def test_perform_test(self):
# Full sample size
n = 200
# mean shift
my = 0.1
dim = 3
ss = data.SSGaussMeanDiff(dim, my=my)
# Consider two dimensions here
for s in [2, 8, 9]:
with util.NumpySeedContext(seed=s):
tst_data = ss.sample(n, seed=s)
locs = np.random.randn(2, dim)
k = kernel.KGauss(1)
me1 = tst.METest(locs[[0], :], k, alpha=0.01)
result1 = me1.perform_test(tst_data)
self.assertGreaterEqual(result1['pvalue'], 0)
self.assertGreaterEqual(result1['test_stat'], 0)
me2 = tst.METest(locs, k, alpha=0.01)
result2 = me2.perform_test(tst_data)
self.assertGreaterEqual(result2['pvalue'], 0)
self.assertGreaterEqual(result2['test_stat'], 0)
