def _generate_atomic_grid(rgrid, degs, rotate=False):
"""Generate atomic grid for each radial point with angular degree L.
Parameters
----------
rgrid : Grid, radial grid of given atomic grid.
degs : np.ndarray(N,), an array of magic number for each radial point.
rotate : boolean or int, whether a rotation will be applied to grid
Returns
-------
tuple(np.ndarray(M,), np.ndarray(M,), np.ndarray(N,)),
grid points, grid weights, and indices for each shell.
"""
if len(degs) != rgrid.size:
raise ValueError(
"The shape of radial grid does not match given degs.")
all_points, all_weights = [], []
# Preload spherical information in case of repeated IO
unique_degs = np.unique(degs)
sphere_grids = {
i: generate_lebedev_grid(degree=i)
for i in unique_degs
}
shell_pt_indices = np.zeros(len(degs) + 1,
dtype=int) # set index to int
for i, deg_i in enumerate(degs): # TODO: proper tests
sphere_grid = sphere_grids[deg_i]
if rotate is False:
pass
# if rotate is True, rotate each shell
elif rotate is True:
rot_mt = R.random().as_matrix()
new_points = sphere_grid.points @ rot_mt
sphere_grid = AngularGrid(new_points, sphere_grid.weights)
# if rotate is a seed
else:
assert isinstance(rotate, int) # check seed proper value
rot_mt = R.random(random_state=rotate + i).as_matrix()
new_points = sphere_grid.points @ rot_mt
sphere_grid = AngularGrid(new_points, sphere_grid.weights)
# construct atomic grid with each radial point and each spherical shell
# compute points
points = sphere_grid.points * rgrid[i].points
# compute weights
weights = sphere_grid.weights * rgrid[i].weights * rgrid[
i].points**2
# locate separators
shell_pt_indices[i + 1] = shell_pt_indices[i] + len(points)
all_points.append(points)
all_weights.append(weights)
indices = shell_pt_indices
points = np.vstack(all_points)
weights = np.hstack(all_weights)
return points, weights, indices
def test_get_shell_grid(self):
"""Test angular grid get from get_shell_grid function."""
rad_pts = np.array([0.1, 0.5, 1])
rad_wts = np.array([0.3, 0.4, 0.3])
rad_grid = OneDGrid(rad_pts, rad_wts)
degs = [3, 5, 7]
atgrid = AtomGrid(rad_grid, degs=degs)
assert atgrid.n_shells == 3
# grep shell with r^2
for i in range(atgrid.n_shells):
sh_grid = atgrid.get_shell_grid(i)
assert isinstance(sh_grid, AngularGrid)
ref_grid = generate_lebedev_grid(degree=degs[i])
assert np.allclose(sh_grid.points, ref_grid.points * rad_pts[i])
assert np.allclose(sh_grid.weights,
ref_grid.weights * rad_wts[i] * rad_pts[i]**2)
# grep shell without r^2
for i in range(atgrid.n_shells):
sh_grid = atgrid.get_shell_grid(i, r_sq=False)
assert isinstance(sh_grid, AngularGrid)
ref_grid = generate_lebedev_grid(degree=degs[i])
assert np.allclose(sh_grid.points, ref_grid.points * rad_pts[i])
assert np.allclose(sh_grid.weights, ref_grid.weights * rad_wts[i])
def _preload_unit_sphere_grid(degs):
"""Preload spherical information incase repeated IO.
Parameters
----------
degs : np.ndarray(N,), an array of preferred magic number degrees.
Returns
-------
dict{degree: AngularGrid}
"""
# if non-magic number will bring redundancy. But it only link by ref,
# so the efficiency would be fine.
unique_degs = np.unique(degs)
return {i: generate_lebedev_grid(degree=i) for i in unique_degs}
def test_lebedev_laikov_sphere(self):
"""Levedev grid tests from old grid."""
previous_npoint = 0
for i in range(1, 132):
npoint = _select_grid_type(degree=i)[1]
if npoint > previous_npoint:
grid = generate_lebedev_grid(size=npoint)
assert isinstance(grid, AngularGrid)
assert_allclose(grid.weights.sum(), 1.0 * 4 * np.pi)
assert_allclose(grid.points[:, 0].sum(), 0, atol=1e-10)
assert_allclose(grid.points[:, 1].sum(), 0, atol=1e-10)
assert_allclose(grid.points[:, 2].sum(), 0, atol=1e-10)
assert_allclose(np.dot(grid.points[:, 0], grid.weights), 0, atol=1e-10)
assert_allclose(np.dot(grid.points[:, 1], grid.weights), 0, atol=1e-10)
assert_allclose(np.dot(grid.points[:, 2], grid.weights), 0, atol=1e-10)
previous_npoint = npoint
def test_generate_atomic_grid(self):
"""Test for generating atomic grid."""
# setup testing class
rad_pts = np.array([0.1, 0.5, 1])
rad_wts = np.array([0.3, 0.4, 0.3])
rad_grid = OneDGrid(rad_pts, rad_wts)
degs = np.array([3, 5, 7])
pts, wts, ind = AtomGrid._generate_atomic_grid(rad_grid, degs)
assert len(pts) == 46
assert_equal(ind, [0, 6, 20, 46])
# set tests for slicing grid from atomic grid
for i in range(3):
# set each layer of points
ref_grid = generate_lebedev_grid(degree=degs[i])
# check for each point
assert_allclose(pts[ind[i]:ind[i + 1]],
ref_grid.points * rad_pts[i])
# check for each weight
assert_allclose(
wts[ind[i]:ind[i + 1]],
ref_grid.weights * rad_wts[i] * rad_pts[i]**2,
)
def setUp(self):
"""Generate atomic grid for constant test call."""
self.ang_grid = generate_lebedev_grid(degree=7)
def test_errors_and_warnings(self):
"""Tests for errors and warning."""
# low level function tests
with self.assertRaises(ValueError):
_select_grid_type()
with self.assertRaises(ValueError):
_select_grid_type(degree=-1)
with self.assertRaises(ValueError):
_select_grid_type(degree=132)
with self.assertRaises(ValueError):
_select_grid_type(size=-1)
with self.assertRaises(ValueError):
_select_grid_type(size=6000)
with self.assertWarns(RuntimeWarning):
_select_grid_type(degree=5, size=10)
# high level function tests
with self.assertRaises(ValueError):
generate_lebedev_grid()
with self.assertRaises(ValueError):
generate_lebedev_grid(size=6000)
with self.assertRaises(ValueError):
generate_lebedev_grid(size=-1)
with self.assertRaises(ValueError):
generate_lebedev_grid(degree=132)
with self.assertRaises(ValueError):
generate_lebedev_grid(degree=-2)
with self.assertWarns(RuntimeWarning):
generate_lebedev_grid(degree=5, size=10)
