def test_maxwell_filter_additional():
"""Test processing of Maxwell filtered data"""
# TODO: Future tests integrate with mne/io/tests/test_proc_history
# Load testing data (raw, SSS std origin, SSS non-standard origin)
data_path = op.join(testing.data_path(download=False))
file_name = 'test_move_anon'
raw_fname = op.join(data_path, 'SSS', file_name + '_raw.fif')
with warnings.catch_warnings(record=True): # maxshield
# Use 2.0 seconds of data to get stable cov. estimate
raw = Raw(raw_fname, preload=False, proj=False,
allow_maxshield=True).crop(0., 2., False)
# Get MEG channels, compute Maxwell filtered data
raw.preload_data()
raw.pick_types(meg=True, eeg=False)
int_order, ext_order = 8, 3
raw_sss = maxwell.maxwell_filter(raw,
int_order=int_order,
ext_order=ext_order)
# Test io on processed data
tempdir = _TempDir()
test_outname = op.join(tempdir, 'test_raw_sss.fif')
raw_sss.save(test_outname)
raw_sss_loaded = Raw(test_outname,
preload=True,
proj=False,
allow_maxshield=True)
# Some numerical imprecision since save uses 'single' fmt
assert_allclose(raw_sss_loaded._data[:, :],
raw_sss._data[:, :],
rtol=1e-6,
atol=1e-20)
# Test rank of covariance matrices for raw and SSS processed data
cov_raw = compute_raw_data_covariance(raw)
cov_sss = compute_raw_data_covariance(raw_sss)
scalings = None
cov_raw_rank = _estimate_rank_meeg_cov(cov_raw['data'], raw.info, scalings)
cov_sss_rank = _estimate_rank_meeg_cov(cov_sss['data'], raw_sss.info,
scalings)
assert_equal(cov_raw_rank, raw.info['nchan'])
assert_equal(cov_sss_rank, maxwell.get_num_moments(int_order, 0))
def test_maxwell_filter_additional():
"""Test processing of Maxwell filtered data"""
# TODO: Future tests integrate with mne/io/tests/test_proc_history
# Load testing data (raw, SSS std origin, SSS non-standard origin)
data_path = op.join(testing.data_path(download=False))
file_name = 'test_move_anon'
raw_fname = op.join(data_path, 'SSS', file_name + '_raw.fif')
with warnings.catch_warnings(record=True): # maxshield
# Use 2.0 seconds of data to get stable cov. estimate
raw = Raw(raw_fname, preload=False, proj=False,
allow_maxshield=True).crop(0., 2., False)
# Get MEG channels, compute Maxwell filtered data
raw.load_data()
raw.pick_types(meg=True, eeg=False)
int_order, ext_order = 8, 3
raw_sss = maxwell.maxwell_filter(raw, int_order=int_order,
ext_order=ext_order)
# Test io on processed data
tempdir = _TempDir()
test_outname = op.join(tempdir, 'test_raw_sss.fif')
raw_sss.save(test_outname)
raw_sss_loaded = Raw(test_outname, preload=True, proj=False,
allow_maxshield=True)
# Some numerical imprecision since save uses 'single' fmt
assert_allclose(raw_sss_loaded._data[:, :], raw_sss._data[:, :],
rtol=1e-6, atol=1e-20)
# Test rank of covariance matrices for raw and SSS processed data
cov_raw = compute_raw_covariance(raw)
cov_sss = compute_raw_covariance(raw_sss)
scalings = None
cov_raw_rank = _estimate_rank_meeg_cov(cov_raw['data'], raw.info, scalings)
cov_sss_rank = _estimate_rank_meeg_cov(cov_sss['data'], raw_sss.info,
scalings)
assert_equal(cov_raw_rank, raw.info['nchan'])
assert_equal(cov_sss_rank, maxwell.get_num_moments(int_order, 0))
def test_maxwell_filter():
"""Test multipolar moment and Maxwell filter"""
# TODO: Future tests integrate with mne/io/tests/test_proc_history
# Load testing data (raw, SSS std origin, SSS non-standard origin)
with warnings.catch_warnings(record=True): # maxshield
raw = Raw(raw_fname, preload=False, proj=False,
allow_maxshield=True).crop(0., 1., False)
raw.preload_data()
with warnings.catch_warnings(record=True): # maxshield, naming
sss_std = Raw(sss_std_fname,
preload=True,
proj=False,
allow_maxshield=True)
sss_nonStd = Raw(sss_nonstd_fname,
preload=True,
proj=False,
allow_maxshield=True)
raw_err = Raw(raw_fname,
preload=False,
proj=True,
allow_maxshield=True).crop(0., 0.1, False)
assert_raises(RuntimeError, maxwell.maxwell_filter, raw_err)
# Create coils
all_coils, _, _, meg_info = _prep_meg_channels(raw.info,
ignore_ref=True,
elekta_defs=True)
picks = [
raw.info['ch_names'].index(ch)
for ch in [coil['chname'] for coil in all_coils]
]
coils = [all_coils[ci] for ci in picks]
ncoils = len(coils)
int_order, ext_order = 8, 3
n_int_bases = int_order**2 + 2 * int_order
n_ext_bases = ext_order**2 + 2 * ext_order
nbases = n_int_bases + n_ext_bases
# Check number of bases computed correctly
assert_equal(maxwell.get_num_moments(int_order, ext_order), nbases)
# Check multipolar moment basis set
S_in, S_out = maxwell._sss_basis(origin=np.array([0, 0, 40]),
coils=coils,
int_order=int_order,
ext_order=ext_order)
assert_equal(S_in.shape, (ncoils, n_int_bases), 'S_in has incorrect shape')
assert_equal(S_out.shape, (ncoils, n_ext_bases),
'S_out has incorrect shape')
# Test sss computation at the standard head origin
raw_sss = maxwell.maxwell_filter(raw,
origin=[0., 0., 40.],
int_order=int_order,
ext_order=ext_order)
assert_array_almost_equal(raw_sss._data[picks, :],
sss_std._data[picks, :],
decimal=11,
err_msg='Maxwell filtered data at '
'standard origin incorrect.')
# Confirm SNR is above 100
bench_rms = np.sqrt(np.mean(sss_std._data[picks, :]**2, axis=1))
error = raw_sss._data[picks, :] - sss_std._data[picks, :]
error_rms = np.sqrt(np.mean(error**2, axis=1))
assert_true(np.mean(bench_rms / error_rms) > 1000, 'SNR < 1000')
# Test sss computation at non-standard head origin
raw_sss = maxwell.maxwell_filter(raw,
origin=[0., 20., 20.],
int_order=int_order,
ext_order=ext_order)
assert_array_almost_equal(raw_sss._data[picks, :],
sss_nonStd._data[picks, :],
decimal=11,
err_msg='Maxwell filtered data at non-std '
'origin incorrect.')
# Confirm SNR is above 100
bench_rms = np.sqrt(np.mean(sss_nonStd._data[picks, :]**2, axis=1))
error = raw_sss._data[picks, :] - sss_nonStd._data[picks, :]
error_rms = np.sqrt(np.mean(error**2, axis=1))
assert_true(np.mean(bench_rms / error_rms) > 1000, 'SNR < 1000')
# Check against SSS functions from proc_history
sss_info = raw_sss.info['proc_history'][0]['max_info']
assert_equal(maxwell.get_num_moments(int_order, 0),
proc_history._get_sss_rank(sss_info))
def test_maxwell_filter():
"""Test multipolar moment and Maxwell filter"""
# TODO: Future tests integrate with mne/io/tests/test_proc_history
# Load testing data (raw, SSS std origin, SSS non-standard origin)
with warnings.catch_warnings(record=True): # maxshield
raw = Raw(raw_fname, preload=False, proj=False,
allow_maxshield=True).crop(0., 1., False)
raw.load_data()
with warnings.catch_warnings(record=True): # maxshield, naming
sss_std = Raw(sss_std_fname, preload=True, proj=False,
allow_maxshield=True)
sss_nonStd = Raw(sss_nonstd_fname, preload=True, proj=False,
allow_maxshield=True)
raw_err = Raw(raw_fname, preload=False, proj=True,
allow_maxshield=True).crop(0., 0.1, False)
assert_raises(RuntimeError, maxwell.maxwell_filter, raw_err)
# Create coils
all_coils, _, _, meg_info = _prep_meg_channels(raw.info, ignore_ref=True,
elekta_defs=True)
picks = [raw.info['ch_names'].index(ch) for ch in [coil['chname']
for coil in all_coils]]
coils = [all_coils[ci] for ci in picks]
ncoils = len(coils)
int_order, ext_order = 8, 3
n_int_bases = int_order ** 2 + 2 * int_order
n_ext_bases = ext_order ** 2 + 2 * ext_order
nbases = n_int_bases + n_ext_bases
# Check number of bases computed correctly
assert_equal(maxwell.get_num_moments(int_order, ext_order), nbases)
# Check multipolar moment basis set
S_in, S_out = maxwell._sss_basis(origin=np.array([0, 0, 40]), coils=coils,
int_order=int_order, ext_order=ext_order)
assert_equal(S_in.shape, (ncoils, n_int_bases), 'S_in has incorrect shape')
assert_equal(S_out.shape, (ncoils, n_ext_bases),
'S_out has incorrect shape')
# Test sss computation at the standard head origin
raw_sss = maxwell.maxwell_filter(raw, origin=[0., 0., 40.],
int_order=int_order, ext_order=ext_order)
assert_array_almost_equal(raw_sss._data[picks, :], sss_std._data[picks, :],
decimal=11, err_msg='Maxwell filtered data at '
'standard origin incorrect.')
# Confirm SNR is above 100
bench_rms = np.sqrt(np.mean(sss_std._data[picks, :] ** 2, axis=1))
error = raw_sss._data[picks, :] - sss_std._data[picks, :]
error_rms = np.sqrt(np.mean(error ** 2, axis=1))
assert_true(np.mean(bench_rms / error_rms) > 1000, 'SNR < 1000')
# Test sss computation at non-standard head origin
raw_sss = maxwell.maxwell_filter(raw, origin=[0., 20., 20.],
int_order=int_order, ext_order=ext_order)
assert_array_almost_equal(raw_sss._data[picks, :],
sss_nonStd._data[picks, :], decimal=11,
err_msg='Maxwell filtered data at non-std '
'origin incorrect.')
# Confirm SNR is above 100
bench_rms = np.sqrt(np.mean(sss_nonStd._data[picks, :] ** 2, axis=1))
error = raw_sss._data[picks, :] - sss_nonStd._data[picks, :]
error_rms = np.sqrt(np.mean(error ** 2, axis=1))
assert_true(np.mean(bench_rms / error_rms) > 1000, 'SNR < 1000')
# Check against SSS functions from proc_history
sss_info = raw_sss.info['proc_history'][0]['max_info']
assert_equal(maxwell.get_num_moments(int_order, 0),
proc_history._get_sss_rank(sss_info))