def test_coh_solution(self, **kwargs):
res = ca(data=self.data,
method='coh',
foilim=[5, 60],
output='pow',
taper='dpss',
tapsmofrq=1.5,
**kwargs)
# coherence at the harmonic frequencies
idx_f1 = np.argmin(res.freq < self.f1)
peak_f1 = res.data[0, idx_f1, 0, 1]
idx_f2 = np.argmin(res.freq < self.f2)
peak_f2 = res.data[0, idx_f2, 0, 1]
# check low phase diffusion has high coherence
assert peak_f2 > 0.5
# check that with higher phase diffusion the
# coherence is lower
assert peak_f1 < peak_f2
# check that 5Hz away from the harmonics there
# is low coherence
null_idx = (res.freq < self.f1 - 5) | (res.freq > self.f1 + 5)
null_idx *= (res.freq < self.f2 - 5) | (res.freq > self.f2 + 5)
assert np.all(res.data[0, null_idx, 0, 1] < 0.1)
def test_gr_solution(self, **kwargs):
Gcaus = ca(self.data,
method='granger',
taper='dpss',
tapsmofrq=3,
foi=self.foi,
**kwargs)
# check all channel combinations with coupling
for i, j in zip(*self.cpl_idx):
peak = Gcaus.data[0, :, i, j].max()
peak_frq = Gcaus.freq[Gcaus.data[0, :, i, j].argmax()]
cval = self.AdjMat[i, j]
dbg_str = f"{peak:.2f}\t{self.AdjMat[i,j]:.2f}\t {peak_frq:.2f}\t"
print(dbg_str, f'\t {i}', f' {j}')
# test for directional coupling
# at the right frequency range
assert peak >= cval
assert 35 < peak_frq < 45
# only plot with defaults
if len(kwargs) == 0:
plot_Granger(Gcaus, i, j)
ppl.legend()
def test_corr_selections(self):
selections = mk_selection_dicts(self.nTrials, self.nChannels,
*self.time_span)
for sel_dct in selections:
result = ca(self.data, method='corr', select=sel_dct)
# check here just for finiteness and positivity
assert np.all(np.isfinite(result.data))
def test_gr_selections(self):
# trial, channel and toi selections
selections = mk_selection_dicts(self.nTrials, self.nChannels,
*self.time_span)
for sel_dct in selections:
Gcaus = ca(self.data, method='granger', select=sel_dct)
# check here just for finiteness and positivity
assert np.all(np.isfinite(Gcaus.data))
assert np.all(Gcaus.data[0, ...] >= -1e-10)
def test_corr_solution(self, **kwargs):
corr = ca(data=self.data, method='corr', **kwargs)
# test 0-lag autocorr is 1 for all channels
assert np.all(corr.data[0, 0].diagonal() > .99)
# test that at exactly the period-lag
# correlations remain high w/o phase diffusion
period_idx = int(1 / self.f1 * self.fs)
# 100 samples is one period
assert np.allclose(100, period_idx)
auto_00 = corr.data[:, 0, 0, 0]
assert np.all(auto_00[::period_idx] > .99)
# test for auto-corr minima at half the period
assert auto_00[period_idx // 2] < -.99
assert auto_00[period_idx // 2 + period_idx] < -.99
# test signal with phase diffusion (2nd channel) has
# decaying correlations (diffusion may lead to later
# increases of auto-correlation again, hence we check
# only the first 5 periods)
auto_11 = corr.data[:, 0, 1, 1]
assert np.all(np.diff(auto_11[::period_idx])[:5] < 0)
# test that a pi/2 phase shift moves the 1st
# crosscorr maximum to 1/4 of the period
cross_02 = corr.data[:, 0, 0, 2]
lag_idx = int(1 / self.f1 * self.fs * 0.25)
# 25 samples is 1/4th period
assert np.allclose(25, lag_idx)
assert cross_02[lag_idx] > 0.99
# same for a period multiple
assert cross_02[lag_idx + period_idx] > .99
# plus half the period a minimum occurs
assert cross_02[lag_idx + period_idx // 2] < -.99
# test for (anti-)symmetry
cross_20 = corr.data[:, 0, 2, 0]
assert cross_20[-lag_idx] > 0.99
assert cross_20[-lag_idx - period_idx] > 0.99
# only plot for simple solution test
if len(kwargs) == 0:
plot_corr(corr, 0, 0, label='corr 0-0')
plot_corr(corr, 1, 1, label='corr 1-1')
plot_corr(corr, 0, 2, label='corr 0-2')
ppl.xlim((-.01, 0.5))
ppl.ylim((-1.1, 1.3))
ppl.legend(ncol=3)
def test_corr_cfg(self):
call = lambda cfg: ca(self.data, cfg)
run_cfg_test(call, method='corr', positivity=False)
def test_coh_cfg(self):
call = lambda cfg: ca(self.data, cfg)
run_cfg_test(call, method='coh')
def test_coh_foi(self):
call = lambda foi, foilim: ca(
self.data, method='coh', foi=foi, foilim=foilim)
run_foi_test(call, foilim=[0, 70])
def test_gr_cfg(self):
call = lambda cfg: ca(self.data, cfg)
run_cfg_test(call, method='granger')
def test_gr_foi(self):
call = lambda foi, foilim: ca(
self.data, method='granger', foi=foi, foilim=foilim)
run_foi_test(call, foilim=[0, 70])
