def test_fine_cal_io(tmpdir, fname):
"""Test round trip reading/writing of fine calibration .dat file."""
temp_fname = op.join(str(tmpdir), 'fine_cal_temp.dat')
# Load fine calibration file
fine_cal_dict = read_fine_calibration(fname)
# Save temp version of fine calibration file
write_fine_calibration(temp_fname, fine_cal_dict)
fine_cal_dict_reload = read_fine_calibration(temp_fname)
# Load temp version of fine calibration file and compare hashes
assert object_diff(fine_cal_dict, fine_cal_dict_reload) == ''
def test_compute_fine_cal():
"""Test computing fine calibration coefficients."""
raw = read_raw_fif(erm_fname)
want_cal = read_fine_calibration(cal_mf_fname)
got_cal, counts = compute_fine_calibration(raw,
cross_talk=ctc,
n_imbalance=1,
verbose='debug')
assert counts == 1
assert set(got_cal.keys()) == set(want_cal.keys())
assert got_cal['ch_names'] == want_cal['ch_names']
# in practice these should never be exactly 1.
assert sum([(ic == 1.).any() for ic in want_cal['imb_cals']]) == 0
assert sum([(ic == 1.).any() for ic in got_cal['imb_cals']]) == 0
got_imb = np.array(got_cal['imb_cals'], float)
want_imb = np.array(want_cal['imb_cals'], float)
assert got_imb.shape == want_imb.shape == (306, 1)
got_imb, want_imb = got_imb[:, 0], want_imb[:, 0]
orig_locs = np.array([ch['loc'] for ch in raw.info['chs'][:306]])
want_locs = want_cal['locs']
got_locs = got_cal['locs']
assert want_locs.shape == got_locs.shape
orig_trans = _loc_to_coil_trans(orig_locs)
want_trans = _loc_to_coil_trans(want_locs)
got_trans = _loc_to_coil_trans(got_locs)
dist = np.linalg.norm(got_trans[:, :3, 3] - want_trans[:, :3, 3], axis=1)
assert_allclose(dist, 0., atol=1e-6)
dist = np.linalg.norm(got_trans[:, :3, 3] - orig_trans[:, :3, 3], axis=1)
assert_allclose(dist, 0., atol=1e-6)
orig_quat = rot_to_quat(orig_trans[:, :3, :3])
want_quat = rot_to_quat(want_trans[:, :3, :3])
got_quat = rot_to_quat(got_trans[:, :3, :3])
want_orig_angles = np.rad2deg(_angle_between_quats(want_quat, orig_quat))
got_want_angles = np.rad2deg(_angle_between_quats(got_quat, want_quat))
got_orig_angles = np.rad2deg(_angle_between_quats(got_quat, orig_quat))
for key in ('mag', 'grad'):
# imb_cals value
p = pick_types(raw.info, meg=key, exclude=())
r2 = np.dot(got_imb[p], want_imb[p]) / (np.linalg.norm(want_imb[p]) *
np.linalg.norm(got_imb[p]))
assert 0.99 < r2 <= 1.00001, f'{key}: {r2:0.3f}'
# rotation angles
want_orig_max_angle = want_orig_angles[p].max()
got_orig_max_angle = got_orig_angles[p].max()
got_want_max_angle = got_want_angles[p].max()
if key == 'mag':
assert 8 < want_orig_max_angle < 11, want_orig_max_angle
assert 1 < got_orig_max_angle < 2, got_orig_max_angle
assert 9 < got_want_max_angle < 11, got_want_max_angle
else:
# Some of these angles are large, but mostly this has to do with
# processing a very short (one 10-sec segment), downsampled (90 Hz)
# file
assert 66 < want_orig_max_angle < 68, want_orig_max_angle
assert 67 < got_orig_max_angle < 107, got_orig_max_angle
assert 53 < got_want_max_angle < 60, got_want_max_angle
kwargs = dict(bad_condition='warning', cross_talk=ctc, coord_frame='meg')
raw_sss = maxwell_filter(raw, **kwargs)
raw_sss_mf = maxwell_filter(raw, calibration=cal_mf_fname, **kwargs)
raw_sss_py = maxwell_filter(raw, calibration=got_cal, **kwargs)
_assert_shielding(raw_sss, raw, 26, 27)
_assert_shielding(raw_sss_mf, raw, 61, 63)
_assert_shielding(raw_sss_py, raw, 61, 63)
# redoing with given mag data should yield same result
got_cal_redo, _ = compute_fine_calibration(raw,
cross_talk=ctc,
n_imbalance=1,
calibration=got_cal,
verbose='debug')
assert got_cal['ch_names'] == got_cal_redo['ch_names']
assert_allclose(got_cal['imb_cals'], got_cal_redo['imb_cals'], atol=5e-5)
assert_allclose(got_cal['locs'], got_cal_redo['locs'], atol=1e-6)
assert sum([(ic == 1.).any() for ic in got_cal['imb_cals']]) == 0
# redoing with 3 imlabance parameters should improve the shielding factor
grad_picks = pick_types(raw.info, meg='grad')
assert len(grad_picks) == 204 and grad_picks[0] == 0
got_grad_imbs = np.array(
[got_cal['imb_cals'][pick] for pick in grad_picks])
assert got_grad_imbs.shape == (204, 1)
got_cal_3, _ = compute_fine_calibration(raw,
cross_talk=ctc,
n_imbalance=3,
calibration=got_cal,
verbose='debug')
got_grad_3_imbs = np.array(
[got_cal_3['imb_cals'][pick] for pick in grad_picks])
assert got_grad_3_imbs.shape == (204, 3)
corr = np.corrcoef(got_grad_3_imbs[:, 0], got_grad_imbs[:, 0])[0, 1]
assert 0.6 < corr < 0.7
raw_sss_py = maxwell_filter(raw, calibration=got_cal_3, **kwargs)
_assert_shielding(raw_sss_py, raw, 68, 70)
