def test_precomputed_interpolation_empty(self):
shape = (101, 101)
origin = (0, 0)
grid = Grid(shape=shape, origin=origin)
x, y = grid.dimensions
# because we interpolate across 2 neighbouring points in each dimension
r = 2
nt = 10
m = TimeFunction(name="m",
grid=grid,
space_order=0,
save=nt,
time_order=0)
for it in range(nt):
m.data[it, :] = it
mat = scipy.sparse.coo_matrix((0, 0), dtype=np.float32)
sf = MatrixSparseTimeFunction(name="s",
grid=grid,
r=r,
matrix=mat,
nt=nt)
eqn = sf.interpolate(m)
op = Operator(eqn)
sf.manual_scatter()
op(time_m=0, time_M=9)
sf.manual_gather()
def test_msf_interpolate():
""" Test interpolation with MatrixSparseTimeFunction which accepts
precomputed values for interpolation coefficients, but this time
with a TimeFunction
"""
shape = (101, 101)
points = [(.05, .9), (.01, .8), (0.07, 0.84)]
origin = (0, 0)
grid = Grid(shape=shape, origin=origin)
r = 2 # Constant for linear interpolation
# because we interpolate across 2 neighbouring points in each dimension
u = TimeFunction(name='u', grid=grid, space_order=0, save=5)
for it in range(5):
u.data[it, :] = it
gridpoints, interpolation_coeffs = precompute_linear_interpolation(points,
grid, origin)
matrix = scipy.sparse.eye(len(points))
sf = MatrixSparseTimeFunction(
name='s', grid=grid, r=r, matrix=matrix, nt=5
)
sf.gridpoints.data[:] = gridpoints
sf.coefficients_x.data[:] = interpolation_coeffs[:, 0, :]
sf.coefficients_y.data[:] = interpolation_coeffs[:, 0, :]
assert sf.data.shape == (5, 3)
eqn = sf.interpolate(u)
op = Operator(eqn)
print(op)
sf.manual_scatter()
op(time_m=0, time_M=4)
sf.manual_gather()
for it in range(5):
assert np.allclose(sf.data[it, :], it)
# Now test injection
u.data[:] = 0
eqn_inject = sf.inject(field=u, expr=sf)
op2 = Operator(eqn_inject)
print(op2)
op2(time_m=0, time_M=4)
# There should be 4 points touched for each source point
# (5, 90), (1, 80), (7, 84) and x+1, y+1 for each
nzt, nzx, nzy = np.nonzero(u.data)
assert np.all(np.unique(nzx) == np.array([1, 2, 5, 6, 7, 8]))
assert np.all(np.unique(nzy) == np.array([80, 81, 84, 85, 90, 91]))
assert np.all(np.unique(nzt) == np.array([1, 2, 3, 4]))
# 12 points x 4 timesteps
assert nzt.size == 48
def test_precomputed_subpoints(self):
shape = (101, 101)
grid = Grid(shape=shape)
x, y = grid.dimensions
r = 2 # Constant for linear interpolation
# because we interpolate across 2 neighbouring points in each dimension
nt = 10
m = TimeFunction(name="m",
grid=grid,
space_order=0,
save=None,
time_order=1)
m.data[:] = 0.0
m.data[:, 40, 40] = 1.0
# Two-location source with 2 coefficients the same
matrix = scipy.sparse.coo_matrix(np.array([[1], [1]],
dtype=np.float32))
sf = MatrixSparseTimeFunction(name="s",
grid=grid,
r=r,
matrix=matrix,
nt=nt)
# Lookup the exact point
sf.gridpoints.data[0, 0] = 40
sf.gridpoints.data[0, 1] = 40
sf.interpolation_coefficients[x].data[0, 0] = 1.0
sf.interpolation_coefficients[x].data[0, 1] = 2.0
sf.interpolation_coefficients[y].data[0, 0] = 1.0
sf.interpolation_coefficients[y].data[0, 1] = 2.0
sf.gridpoints.data[1, 0] = 39
sf.gridpoints.data[1, 1] = 39
sf.interpolation_coefficients[x].data[1, 0] = 1.0
sf.interpolation_coefficients[x].data[1, 1] = 2.0
sf.interpolation_coefficients[y].data[1, 0] = 1.0
sf.interpolation_coefficients[y].data[1, 1] = 2.0
sf.data[:] = 0.0
step = [Eq(m.forward, m)]
interp = sf.interpolate(m)
op = Operator(step + interp)
sf.manual_scatter()
op(time_m=0, time_M=0)
sf.manual_gather()
assert sf.data[0, 0] == 5.0
def test_precomputed_interpolation(self):
shape = (101, 101)
points = [(0.05, 0.9), (0.01, 0.8), (0.07, 0.84)]
origin = (0, 0)
grid = Grid(shape=shape, origin=origin)
x, y = grid.dimensions
r = 2
nt = 10
m = TimeFunction(name="m",
grid=grid,
space_order=0,
save=nt,
time_order=0)
for it in range(nt):
m.data[it, :] = it
gridpoints, coefficients = self._precompute_linear_interpolation(
points, grid, origin)
mat = scipy.sparse.eye(len(points), dtype=np.float32)
sf = MatrixSparseTimeFunction(name="s",
grid=grid,
r=r,
matrix=mat,
nt=nt)
sf.gridpoints.data[:] = gridpoints
sf.interpolation_coefficients[x].data[:] = coefficients[:, 0, :]
sf.interpolation_coefficients[y].data[:] = coefficients[:, 1, :]
eqn = sf.interpolate(m)
op = Operator(eqn)
sf.manual_scatter()
# args = op.arguments(time_m=0, time_M=9)
op(time_m=0, time_M=9)
sf.manual_gather()
for it in range(nt):
assert np.all(sf.data[it, :] == pytest.approx(it))
def test_empty_arrays(self):
"""
MFE for issue #1641.
"""
grid = Grid(shape=(4, 4), extent=(3.0, 3.0))
f = TimeFunction(name='f', grid=grid, space_order=0)
f.data[:] = 1.
sf1 = SparseTimeFunction(name='sf1', grid=grid, npoint=0, nt=10)
sf2 = SparseTimeFunction(name='sf2', grid=grid, npoint=0, nt=10)
assert sf1.size == 0
assert sf2.size == 0
eqns = sf1.inject(field=f, expr=sf1 + sf2 + 1.)
op = Operator(eqns)
op.apply()
assert np.all(f.data == 1.)
# Again, but with a MatrixSparseTimeFunction
mat = scipy.sparse.coo_matrix((0, 0), dtype=np.float32)
sf = MatrixSparseTimeFunction(name="s",
grid=grid,
r=2,
matrix=mat,
nt=10)
assert sf.size == 0
eqns = sf.interpolate(f)
op = Operator(eqns)
sf.manual_scatter()
op(time_m=0, time_M=9)
sf.manual_gather()
assert np.all(f.data == 1.)
def test_mpi(self):
# Shape chosen to get a source in multiple ranks
shape = (91, 91)
grid = Grid(shape=shape)
x, y = grid.dimensions
# because we interpolate across 2 neighbouring points in each dimension
r = 2
nt = 10
# NOTE: halo on function (space_order//2?) must be at least >= r
m = TimeFunction(name="m",
grid=grid,
space_order=4,
save=None,
time_order=1)
m.data[:] = 0.0
m.data[:, 40, 40] = 1.0
m.data[:, 50, 50] = 1.0
# only rank 0 is allowed to have points
if grid.distributor.myrank == 0:
# A single dipole source - so two rows, one column
matrix = scipy.sparse.coo_matrix(
np.array([[1], [-1]], dtype=np.float32))
else:
matrix = scipy.sparse.coo_matrix((0, 0), dtype=np.float32)
sf = MatrixSparseTimeFunction(name="s",
grid=grid,
r=r,
matrix=matrix,
nt=nt)
if grid.distributor.myrank == 0:
# First component of the dipole at 40, 40
sf.gridpoints.data[0, 0] = 40
sf.gridpoints.data[0, 1] = 40
sf.interpolation_coefficients[x].data[0, 0] = 1.0
sf.interpolation_coefficients[x].data[0, 1] = 2.0
sf.interpolation_coefficients[y].data[0, 0] = 1.0
sf.interpolation_coefficients[y].data[0, 1] = 2.0
sf.gridpoints.data[1, 0] = 50
sf.gridpoints.data[1, 1] = 50
sf.interpolation_coefficients[x].data[1, 0] = 2.0
sf.interpolation_coefficients[x].data[1, 1] = 2.0
sf.interpolation_coefficients[y].data[1, 0] = 2.0
sf.interpolation_coefficients[y].data[1, 1] = 2.0
op = Operator(sf.interpolate(m))
sf.manual_scatter()
args = op.arguments(time_m=0, time_M=9)
print("rank %d: %s" % (grid.distributor.myrank, str(args)))
op.apply(time_m=0, time_M=0)
sf.manual_gather()
for i in range(grid.distributor.nprocs):
print("==== from rank %d" % i)
if i == grid.distributor.myrank:
print(repr(sf.data))
grid.distributor.comm.Barrier()
if grid.distributor.myrank == 0:
assert sf.data[0,
0] == -3.0 # 1 * (1 * 1) * 1 + (-1) * (2 * 2) * 1
