def test_lognormal_invariance(comm):
cosmo = cosmology.Planck15
CurrentMPIComm.set(comm)
Plin = cosmology.LinearPower(cosmo, redshift=0.55, transfer='EisensteinHu')
source = LogNormalCatalog(Plin=Plin,
nbar=0.5e-2,
BoxSize=128.,
Nmesh=32,
seed=42)
source1 = LogNormalCatalog(Plin=Plin,
nbar=0.5e-2,
BoxSize=128.,
Nmesh=32,
seed=42,
comm=MPI.COMM_SELF)
assert source.csize == source1.size
allpos = GatherArray(source['Position'].compute(),
root=Ellipsis,
comm=comm)
assert_allclose(allpos, source1['Position'])
alldis = GatherArray(source['Velocity'].compute(),
root=Ellipsis,
comm=comm)
assert_allclose(alldis, source1['Velocity'])
def test_gather_array(comm):
CurrentMPIComm.set(comm)
# object arrays must fail
data1a = numpy.ones(10, dtype=[('test', 'f8')])
data2a = numpy.ones(10, dtype='f8')
data1 = GatherArray(data1a, comm, root=0)
if comm.rank == 0:
numpy.testing.assert_array_equal(data1['test'], 1)
assert len(data1) == 10 * comm.size
else:
assert data1 is None
data2 = GatherArray(data2a, comm, root=0)
if comm.rank == 0:
numpy.testing.assert_array_equal(data2, 1)
assert len(data2) == 10 * comm.size
else:
assert data2 is None
data2 = GatherArray(data2a, comm, root=Ellipsis)
numpy.testing.assert_array_equal(data2, 1)
assert len(data2) == 10 * comm.size
data1 = GatherArray(data1a, comm, root=Ellipsis)
numpy.testing.assert_array_equal(data1['test'], 1)
assert len(data1) == 10 * comm.size
def test_gather_list(comm):
# data
data = numpy.ones(10, dtype=[('a', 'f')])
# can't gather a list
with pytest.raises(ValueError):
data = GatherArray(list(data), comm, root=0)
with pytest.raises(ValueError):
data = GatherArray(list(data), comm, root=Ellipsis)
def test_gather_objects(comm):
CurrentMPIComm.set(comm)
# object arrays must fail
data1 = numpy.ones(10, dtype=[('test', 'O')])
data2 = numpy.ones(10, dtype='O')
with pytest.raises(ValueError):
data1 = GatherArray(data1, comm, root=0)
with pytest.raises(ValueError):
data2 = GatherArray(data2, comm, root=0)
def test_gather_bad_dtype(comm):
# data
if comm.rank == 0:
data = numpy.ones(10, dtype=[('a', 'f4')])
else:
data = numpy.ones(10, dtype=[('a', 'f8')])
# shape mismatch
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=0)
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=Ellipsis)
def test_gather_bad_shape(comm):
# data
if comm.rank == 0:
data = numpy.ones((10, 2))
else:
data = numpy.ones((10, 3))
# shape mismatch
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=0)
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=Ellipsis)
def test_gather_bad_data(comm):
CurrentMPIComm.set(comm)
# data
if comm.rank == 0:
data = numpy.ones(10, dtype=[('a', 'f')])
else:
data = numpy.ones(10, dtype=[('b', 'f')])
# fields mismatch
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=0)
with pytest.raises(ValueError):
data = GatherArray(data, comm, root=Ellipsis)
def test_fibercolls(comm):
from scipy.spatial.distance import pdist, squareform
from nbodykit.utils import ScatterArray, GatherArray
CurrentMPIComm.set(comm)
N = 10000
# generate the initial data
numpy.random.seed(42)
if comm.rank == 0:
ra = 10. * numpy.random.random(size=N)
dec = 5. * numpy.random.random(size=N) - 5.0
else:
ra = None
dec = None
ra = ScatterArray(ra, comm)
dec = ScatterArray(dec, comm)
# compute the fiber collisions
r = FiberCollisions(ra, dec, degrees=True, seed=42)
rad = r._collision_radius_rad
# gather collided and position to root
idx = GatherArray(r.labels['Collided'].compute().astype(bool),
comm,
root=0)
pos = GatherArray(r.source['Position'].compute(), comm, root=0)
# manually compute distances and check on root
if comm.rank == 0:
dists = squareform(pdist(pos, metric='euclidean'))
numpy.fill_diagonal(dists, numpy.inf) # ignore self pairs
# no objects in clean sample (Collided==0) should be within
# the collision radius of any other objects in the sample
clean_dists = dists[~idx, ~idx]
assert (clean_dists <= rad).sum(
) == 0, "objects in 'clean' sample within collision radius!"
# the collided objects must collided with at least
# one object in the clean sample
ncolls_per = (dists[idx] <= rad).sum(axis=-1)
assert (ncolls_per >= 1).all(
), "objects in 'collided' sample that do not collide with any objects!"
def gslice(self, start, stop, end=1, redistribute=True):
"""
Execute a global slice of a CatalogSource.
.. note::
After the global slice is performed, the data is scattered
evenly across all ranks.
Parameters
----------
start : int
the start index of the global slice
stop : int
the stop index of the global slice
step : int, optional
the default step size of the global size
redistribute : bool, optional
if ``True``, evenly re-distribute the sliced data across all
ranks, otherwise just return any local data part of the global
slice
"""
from nbodykit.utils import ScatterArray, GatherArray
# determine the boolean index corresponding to the slice
if self.comm.rank == 0:
index = numpy.zeros(self.csize, dtype=bool)
index[slice(start, stop, end)] = True
else:
index = None
index = self.comm.bcast(index)
# scatter the index back to all ranks
counts = self.comm.allgather(self.size)
index = ScatterArray(index, self.comm, root=0, counts=counts)
# perform the needed local slice
subset = self[index]
# if we don't want to redistribute evenly, just return the slice
if not redistribute:
return subset
# re-distribute each column from the sliced data
# NOTE: currently Gather/ScatterArray requires numpy arrays, but
# in principle we could pass dask arrays around between ranks and
# avoid compute() calls
data = self.compute(*[subset[col] for col in subset])
# gather/scatter each column
evendata = {}
for i, col in enumerate(subset):
alldata = GatherArray(data[i], self.comm, root=0)
evendata[col] = ScatterArray(alldata, self.comm, root=0)
# return a new CatalogSource holding the evenly distributed data
size = len(evendata[col])
toret = self.__class__._from_columns(size, self.comm, **evendata)
return toret.__finalize__(self)
def test_gather_list(comm):
CurrentMPIComm.set(comm)
# data
data = numpy.ones(10, dtype=[('a', 'f')])
# can't gather a list
with pytest.raises(ValueError):
data = GatherArray(list(data), comm, root=0)
def test_uniform_invariant(comm):
cat = UniformCatalog(nbar=2,
BoxSize=100.,
seed=1234,
dtype='f4',
comm=comm)
cat1 = UniformCatalog(nbar=2,
BoxSize=100.,
seed=1234,
dtype='f4',
comm=MPI.COMM_SELF)
allpos = GatherArray(cat['Position'].compute(), root=Ellipsis, comm=comm)
assert_array_equal(allpos, cat1['Position'])
allvel = GatherArray(cat['Velocity'].compute(), root=Ellipsis, comm=comm)
assert_array_equal(allvel, cat1['Velocity'])
def __makesource__(self):
"""
Make the source of galaxies by performing the halo HOD population
.. note::
The mock population is only done by the root, and the resulting
catalog is then distributed evenly amongst the available ranks
"""
from astropy.table import Table
# gather all halos to root
halo_table = find_object_dtypes(self._halos.halo_table)
all_halos = GatherArray(halo_table.as_array(), self.comm, root=0)
# root does the mock population
if self.comm.rank == 0:
# set the halo table on the root to the Table containing all halo
self._halos.halo_table = Table(data=all_halos, copy=True)
del all_halos
# populate
self._model.populate_mock(halocat=self._halos, halo_mass_column_key=self.mass,
Num_ptcl_requirement=1, seed=self.attrs['seed'])
# remap gal_type to integers (cen: 0, sats: 1)
gal_type_integers(self._model.mock.galaxy_table)
# crash if any object dtypes
data = find_object_dtypes(self._model.mock.galaxy_table).as_array()
del self._model.mock.galaxy_table
else:
data = None
# log the stats
if self.comm.rank == 0:
self._log_populated_stats(data)
return ScatterArray(data, self.comm)
def poisson_sample_to_points(delta,
displacement,
pm,
nbar,
bias=1.,
seed=None,
comm=None):
"""
Poisson sample the linear delta and displacement fields to points.
The steps in this function:
#. Apply a biased, lognormal transformation to the input ``delta`` field
#. Poisson sample the overdensity field to discrete points
#. Disribute the positions of particles uniformly within the mesh cells,
and assign the displacement field at each cell to the particles
Parameters
----------
delta : RealField
the linear overdensity field to sample
displacement : list of RealField (3,)
the linear displacement fields which is used to move the particles
nbar : float
the desired number density of the output catalog of objects
bias : float, optional
apply a linear bias to the overdensity field (default is 1.)
seed : int, optional
the random seed used to Poisson sample the field to points
Returns
-------
pos : array_like, (N, 3)
the Cartesian positions of each of the generated particles
displ : array_like, (N, 3)
the displacement field sampled for each of the generated particles in the
same units as the ``pos`` array
"""
if comm is None:
comm = MPI.COMM_WORLD
# create a random state with the input seed
rng = numpy.random.RandomState(seed)
# apply the lognormal transformation to the initial conditions density
# this creates a positive-definite delta (necessary for Poisson sampling)
lagrangian_bias = bias - 1.
delta = lognormal_transform(delta, bias=lagrangian_bias)
# mean number of objects per cell
H = delta.BoxSize / delta.Nmesh
overallmean = H.prod() * nbar
# number of objects in each cell (per rank)
cellmean = delta.value * overallmean
cellmean = GatherArray(cellmean.flatten(), comm, root=0)
# rank 0 computes the poisson sampling
if comm.rank == 0:
N = rng.poisson(cellmean)
else:
N = None
# scatter N back evenly across the ranks
counts = comm.allgather(delta.value.size)
N = ScatterArray(N, comm, root=0, counts=counts).reshape(delta.shape)
Nlocal = N.sum() # local number of particles
Ntot = comm.allreduce(Nlocal) # the collective number of particles
nonzero_cells = N.nonzero() # indices of nonzero cells
# initialize the mesh of particle positions and displacement
# this has the shape: (number of dimensions, number of nonzero cells)
pos_mesh = numpy.empty(numpy.shape(nonzero_cells), dtype=delta.dtype)
disp_mesh = numpy.empty_like(pos_mesh)
# generate the coordinates for each nonzero cell
for i in range(delta.ndim):
# particle positions initially on the coordinate grid
pos_mesh[i] = numpy.squeeze(delta.pm.x[i])[nonzero_cells[i]]
# displacements for each particle
disp_mesh[i] = displacement[i][nonzero_cells]
# rank 0 computes the in-cell uniform offsets
if comm.rank == 0:
in_cell_shift = numpy.empty((Ntot, delta.ndim), dtype=delta.dtype)
for i in range(delta.ndim):
in_cell_shift[:, i] = rng.uniform(0, H[i], size=Ntot)
else:
in_cell_shift = None
# scatter the in-cell uniform offsets back to the ranks
counts = comm.allgather(Nlocal)
in_cell_shift = ScatterArray(in_cell_shift, comm, root=0, counts=counts)
# initialize the output array of particle positions and displacement
# this has shape: (local number of particles, number of dimensions)
pos = numpy.zeros((Nlocal, delta.ndim), dtype=delta.dtype)
disp = numpy.zeros_like(pos)
# coordinates of each object (placed randomly in each cell)
for i in range(delta.ndim):
pos[:, i] = numpy.repeat(pos_mesh[i],
N[nonzero_cells]) + in_cell_shift[:, i]
pos[:, i] %= delta.BoxSize[i]
# displacements of each object
for i in range(delta.ndim):
disp[:, i] = numpy.repeat(disp_mesh[i], N[nonzero_cells])
return pos, disp
def main():
"""
Convert grids4plots 3d grids to 2d slices.
"""
#####################################
# PARSE COMMAND LINE ARGS
#####################################
ap = ArgumentParser()
ap.add_argument('--inbasepath',
type=str,
default='$SCRATCH/perr/grids4plots/',
help='Input base path.')
ap.add_argument('--outbasepath',
type=str,
default='$SCRATCH/perr/grids4plots/',
help='Output base path.')
ap.add_argument(
'--inpath',
type=str,
default=
'main_calc_Perr_2020_Sep_22_18:44:31_time1600800271.dill', # laptop
#default='main_calc_Perr_2020_Aug_26_02:49:57_time1598410197.dill', # cluster
help='Input path.')
ap.add_argument('--Rsmooth',
type=float,
default=2.0,
help='3D Gaussian smoothing applied to field.')
# min and max index included in output. inclusive.
ap.add_argument('--ixmin',
type=int,
default=5,
help='xmin of output. must be between 0 and Ngrid.')
ap.add_argument('--ixmax', type=int, default=5, help='xmax of output')
ap.add_argument('--iymin', type=int, default=0, help='ymin of output')
ap.add_argument('--iymax', type=int, default=-1, help='ymax of output')
ap.add_argument('--izmin', type=int, default=0, help='zmin of output')
ap.add_argument('--izmax', type=int, default=-1, help='zmax of output')
cmd_args = ap.parse_args()
verbose = True
#####################################
# START PROGRAM
#####################################
comm = CurrentMPIComm.get()
rank = comm.rank
path = os.path.join(os.path.expandvars(cmd_args.inbasepath),
cmd_args.inpath)
if rank == 0:
print('path: ', path)
initialized_slicecat = False
for fname in os.listdir(path):
if fname.startswith('SLICE'):
continue
full_fname = os.path.join(path, fname)
print('%d Reading %s' % (rank, full_fname))
inmesh = BigFileMesh(full_fname,
dataset='tmp4storage',
header='header')
Ngrid = inmesh.attrs['Ngrid']
boxsize = inmesh.attrs['boxsize']
# apply smoothing
mesh = apply_smoothing(inmesh, mode='Gaussian', R=cmd_args.Rsmooth)
del inmesh
# convert indices to modulo ngrid
ixmin = cmd_args.ixmin % Ngrid
ixmax = cmd_args.ixmax % Ngrid
iymin = cmd_args.iymin % Ngrid
iymax = cmd_args.iymax % Ngrid
izmin = cmd_args.izmin % Ngrid
izmax = cmd_args.izmax % Ngrid
# convert to boxsize units (Mpc/h)
xmin = float(ixmin) / float(Ngrid) * boxsize
xmax = float(ixmax + 1) / float(Ngrid) * boxsize
ymin = float(iymin) / float(Ngrid) * boxsize
ymax = float(iymax + 1) / float(Ngrid) * boxsize
zmin = float(izmin) / float(Ngrid) * boxsize
zmax = float(izmax + 1) / float(Ngrid) * boxsize
if not initialized_slicecat:
# Generate catalog with positions of slice points, to readout mesh there.
# First generate all 3D points. Then keep only subset in slice.
# THen readout mesh at those points.
# use pmesh generate_uniform_particle_grid
# http://rainwoodman.github.io/pmesh/pmesh.pm.html?highlight=
# readout#pmesh.pm.ParticleMesh.generate_uniform_particle_grid
partmesh = ParticleMesh(BoxSize=boxsize,
Nmesh=[Ngrid, Ngrid, Ngrid])
ptcles = partmesh.generate_uniform_particle_grid(shift=0.0,
dtype='f8')
#print("type ptcles", type(ptcles), ptcles.shape)
#print("head ptcles:", ptcles[:5,:])
dtype = np.dtype([('Position', ('f8', 3))])
# number of rows is given by number of ptcles on this rank
uni_cat_array = np.empty((ptcles.shape[0], ), dtype=dtype)
uni_cat_array['Position'] = ptcles
uni_cat = ArrayCatalog(uni_cat_array,
comm=None,
BoxSize=boxsize * np.ones(3),
Nmesh=[Ngrid, Ngrid, Ngrid])
del ptcles
del uni_cat_array
print("%d: Before cut: local Nptcles=%d, global Nptcles=%d" %
(comm.rank, uni_cat.size, uni_cat.csize))
# only keep points in the slice
uni_cat = uni_cat[(uni_cat['Position'][:, 0] >= xmin)
& (uni_cat['Position'][:, 0] < xmax)
& (uni_cat['Position'][:, 1] >= ymin)
& (uni_cat['Position'][:, 1] < ymax)
& (uni_cat['Position'][:, 2] >= zmin)
& (uni_cat['Position'][:, 2] < zmax)]
print("%d: After cut: local Nptcles=%d, global Nptcles=%d" %
(comm.rank, uni_cat.size, uni_cat.csize))
initialized_slicecat = True
# read out full 3D mesh at catalog positions. this is a numpy array
slicecat = readout_mesh_at_cat_pos(mesh=mesh,
cat=uni_cat,
readout_window='nearest')
if rank == 0:
print('slicecat type:', type(slicecat))
slicecat = GatherArray(slicecat, comm, root=0)
if rank == 0:
if not slicecat.shape == ((ixmax - ixmin + 1) *
(iymax - iymin + 1) *
(izmax - izmin + 1), ):
raise Exception(
'Unexpected shape of particles read out on slice: %s' %
str(slicecat.shape))
slicecat = slicecat.reshape(
(ixmax - ixmin + 1, iymax - iymin + 1, izmax - izmin + 1))
print('slicecat shape:', slicecat.shape)
if verbose:
print('slicecat:', slicecat)
# convert to a mesh. assume full numpy array sits on rank 0.
Lx = xmax - xmin
Ly = ymax - ymin
Lz = zmax - zmin
if Lx == 0.: Lx = boxsize / float(Ngrid)
if Ly == 0.: Ly = boxsize / float(Ngrid)
if Lz == 0.: Lz = boxsize / float(Ngrid)
BoxSize_slice = np.array([Lx, Ly, Lz])
slicemesh = ArrayMesh(slicecat, BoxSize=BoxSize_slice, root=0)
outshape = slicemesh.compute(mode='real').shape
if verbose:
print('slicemesh: ', slicemesh.compute(mode='real'))
# write to disk
outpath = os.path.join(
os.path.expandvars(cmd_args.outbasepath), cmd_args.inpath,
'SLICE_R%g_%d-%d_%d-%d_%d-%d/' %
(cmd_args.Rsmooth, ixmin, ixmax, iymin, iymax, izmin, izmax))
if rank == 0:
if not os.path.exists(outpath):
os.makedirs(outpath)
full_outfname = os.path.join(outpath, fname)
if rank == 0:
print('Writing %s' % full_outfname)
slicemesh.save(full_outfname)
if rank == 0:
print('Wrote %s' % full_outfname)
def populate(self, model, BoxSize=None, seed=None, **params):
"""
Populate the HaloCatalog using a :mod:`halotools` model.
The model can be a built-in model from :mod:`nbodykit.hod` (which
will be converted to a Halotools model) or directly a Halotools model
instance.
This assumes that this is the first time this catalog has been
populated with the input model. To re-populate using the same
model (but different parameters), call the :func:`repopulate`
function of the returned :class:`PopulatedHaloCatalog`.
Parameters
----------
model : :class:`nbodykit.hod.HODModel` or halotools model object
the model instance to use to populate; model types from
:mod:`nbodykit.hod` will automatically be converted
BoxSize : float, 3-vector, optional
the box size of the catalog; this must be supplied if 'BoxSize'
is not in :attr:`attrs`
seed : int, optional
the random seed to use when populating the mock
**params :
key/value pairs specifying the model parameters to use
Returns
-------
cat : :class:`PopulatedHaloCatalog`
the catalog object storing information about the populated objects
Examples
--------
Initialize a demo halo catalog:
>>> from nbodykit.tutorials import DemoHaloCatalog
>>> cat = DemoHaloCatalog('bolshoi', 'rockstar', 0.5)
Populate with the built-in Zheng07 model:
>>> from nbodykit.hod import Zheng07Model
>>> galcat = cat.populate(Zheng07Model, seed=42)
And then re-populate galaxy catalog with new parameters:
>>> galcat.repopulate(alpha=0.9, logMmin=13.5, seed=42)
"""
from nbodykit.hod import HODModel
from halotools.empirical_models import ModelFactory
from halotools.sim_manager import UserSuppliedHaloCatalog
# handle builtin model types
if isinstance(model, (type, HODModel)) and issubclass(model, HODModel):
model = model.to_halotools(self.cosmo,
self.attrs['redshift'],
self.attrs['mdef'],
concentration_key='halo_nfw_conc')
# check model type
if not isinstance(model, ModelFactory):
raise TypeError(
"model for populating mocks should be a Halotools ModelFactory"
)
# make halotools catalog
halocat = self.to_halotools(BoxSize=BoxSize)
# gather the halo data to root
all_halos = GatherArray(halocat.halo_table.as_array(),
self.comm,
root=0)
# only the root rank needs to store the halo data
if self.comm.rank == 0:
data = {col: all_halos[col] for col in all_halos.dtype.names}
data.update({
col: getattr(halocat, col)
for col in ['Lbox', 'redshift', 'particle_mass']
})
halocat = UserSuppliedHaloCatalog(**data)
else:
halocat = None
# cache the model so we have option to call repopulate later
self.model = model
# return the populated catalog
return _populate_mock(self,
model,
seed=seed,
halocat=halocat,
**params)
def main(ns):
if ns.zlmax is None:
ns.zlmax = max(ns.zs)
zs_list = ns.zs
zlmin = ns.zlmin
zlmax = ns.zlmax
# no need to be accurate here
ds_list = Planck15.comoving_distance(zs_list)
path = ns.source
#'/global/cscratch1/sd/yfeng1/m3127/desi/1536-9201-40eae2464/lightcone/usmesh/'
cat = BigFileCatalog(path, dataset=ns.dataset)
kappa = 0
Nm = 0
kappabar = 0
npix = healpix.nside2npix(ns.nside)
localsize = npix * (cat.comm.rank + 1) // cat.comm.size - npix * (
cat.comm.rank) // cat.comm.size
nbar = (cat.attrs['NC']**3 / cat.attrs['BoxSize']**3 *
cat.attrs['ParticleFraction'])[0]
Nsteps = int(numpy.round((zlmax - zlmin) / ns.zstep))
if Nsteps < 2: Nsteps = 2
z = numpy.linspace(zlmax, zlmin, Nsteps, endpoint=True)
if cat.comm.rank == 0:
cat.logger.info("Splitting data redshift bins %s" % str(z))
for z1, z2 in zip(z[:-1], z[1:]):
import gc
gc.collect()
if cat.comm.rank == 0:
cat.logger.info("nbar = %g, zlmin = %g, zlmax = %g zs = %s" %
(nbar, z2, z1, zs_list))
slice = read_range(cat, 1 / (1 + z1), 1 / (1 + z2))
if slice.csize == 0: continue
if cat.comm.rank == 0:
cat.logger.info("read %d particles" % slice.csize)
kappa1, kappa1bar, Nm1 = make_kappa_maps(slice, ns.nside, zs_list,
ds_list, localsize, nbar)
kappa = kappa + kappa1
Nm = Nm + Nm1
kappabar = kappabar + kappa1bar
cat.comm.barrier()
if cat.comm.rank == 0:
# use bigfile because it allows concurrent write to different datasets.
cat.logger.info("writing to %s", ns.output)
for i, (zs, ds) in enumerate(zip(zs_list, ds_list)):
std = numpy.std(cat.comm.allgather(len(kappa[i])))
mean = numpy.mean(cat.comm.allgather(len(kappa[i])))
if cat.comm.rank == 0:
cat.logger.info(
"started gathering source plane %s, size-var = %g, size-bar = %g"
% (zs, std, mean))
kappa1 = GatherArray(kappa[i], cat.comm)
Nm1 = GatherArray(Nm[i], cat.comm)
if cat.comm.rank == 0:
cat.logger.info("done gathering source plane %s" % zs)
if cat.comm.rank == 0:
fname = ns.output + "/WL-%02.2f-N%04d" % (zs, ns.nside)
cat.logger.info("started writing source plane %s" % zs)
with bigfile.File(fname, create=True) as ff:
ds1 = ff.create_from_array("kappa", kappa1, Nfile=1)
ds2 = ff.create_from_array("Nm", Nm1, Nfile=1)
for d in ds1, ds2:
d.attrs['kappabar'] = kappabar[i]
d.attrs['nside'] = ns.nside
d.attrs['zlmin'] = zlmin
d.attrs['zlmax'] = zlmax
d.attrs['zs'] = zs
d.attrs['ds'] = ds
d.attrs['nbar'] = nbar
cat.comm.barrier()
if cat.comm.rank == 0:
# use bigfile because it allows concurrent write to different datasets.
cat.logger.info("source plane at %g written. " % zs)
def main(ns):
if ns.zlmax is None:
ns.zlmax = max(ns.zs)
zs_list = ns.zs
###### JL hardcode zs_list
#zs_list = numpy.arange(ns.zs, 2.21, 0.1)
zs_list = ns.zs
zlmin = ns.zlmin
zlmax = zs_list[-1]#ns.zlmax
# no need to be accurate here
ds_list = Planck15.comoving_distance(zs_list)
path = ns.source
cat = BigFileCatalog(path, dataset=ns.dataset)
kappa = 0
Nm = 0
kappabar = 0
npix = healpix.nside2npix(ns.nside)
localsize = npix * (cat.comm.rank + 1) // cat.comm.size - npix * (cat.comm.rank) // cat.comm.size
nbar = (cat.attrs['NC'] ** 3 / cat.attrs['BoxSize'] ** 3 * cat.attrs['ParticleFraction'])[0]
# print('DEBUG BoxSize', cat.attrs['BoxSize'])
Nsteps = int(numpy.round((zlmax - zlmin) / ns.zstep))
if Nsteps < 2 : Nsteps = 2
z = numpy.linspace(zlmax, zlmin, Nsteps+1, endpoint=True)
if cat.comm.rank == 0:
cat.logger.info("Splitting data redshift bins %s" % str(z))
kappa_all = numpy.zeros((Nsteps, len(zs_list), localsize))
for i, (z1, z2) in enumerate(zip(z[:-1], z[1:])):
import gc
gc.collect()
if cat.comm.rank == 0:
cat.logger.info("nbar = %g, zlmin = %g, zlmax = %g zs = %s" % (nbar, z2, z1, zs_list))
slice = read_range(cat, 1/(1 + z1), 1 / (1 + z2))
if slice.csize == 0: continue
if cat.comm.rank == 0:
cat.logger.info("read %d particles" % slice.csize)
kappa1, kappa1bar, Nm1 = make_kappa_maps(slice, ns.nside, zs_list, ds_list, localsize, nbar)
kappa = kappa + kappa1
kappa_all[i] = kappa1
Nm = Nm + Nm1
kappabar = kappabar + kappa1bar
cat.comm.barrier()
if cat.comm.rank == 0:
# use bigfile because it allows concurrent write to different datasets.
cat.logger.info("writing to %s", ns.output)
# array to get all map slices
if cat.comm.rank == 0:
kappa1_all = numpy.zeros((Nsteps, int(12*ns.nside**2)))
for i, (zs, ds) in enumerate(zip(zs_list, ds_list)):
std = numpy.std(cat.comm.allgather(len(kappa[i])))
mean = numpy.mean(cat.comm.allgather(len(kappa[i])))
if cat.comm.rank == 0:
cat.logger.info("started gathering source plane %s, size-var = %g, size-bar = %g" % (zs, std, mean))
kappa1 = GatherArray(kappa[i], cat.comm)
Nm1 = GatherArray(Nm[i], cat.comm)
# get slices of kappa map
for j in range(Nsteps):
kappa1_allj = GatherArray(kappa_all[j,i], cat.comm)
if cat.comm.rank == 0:
kappa1_all[j] = kappa1_allj
if cat.comm.rank == 0:
cat.logger.info("done gathering source plane %s" % zs)
if cat.comm.rank == 0:
fname = ns.output + "/WL-%02.2f-N%04d" % (zs, ns.nside)
cat.logger.info("started writing source plane %s" % zs)
with bigfile.File(fname, create=True) as ff:
print('DEBUG', kappa1_all.shape, len(kappa1_all), numpy.dtype((kappa1_all.dtype, kappa1_all.shape[1:])))
ds1 = ff.create_from_array("kappa", kappa1, Nfile=1)
ds2 = ff.create_from_array("Nm", Nm1, Nfile=1)
#ds3 = ff.create_from_array("kappa_all", kappa1_all.T, Nfile=1)#, memorylimit=1024*1024*1024)
for d in ds1, ds2:#, ds3:
d.attrs['kappabar'] = kappabar[i]
d.attrs['nside'] = ns.nside
d.attrs['zlmin'] = zlmin
d.attrs['zlmax'] = zlmax
d.attrs['zstep'] = ns.zstep
d.attrs['zs'] = zs
d.attrs['ds'] = ds
d.attrs['nbar'] = nbar
cat.comm.barrier()
if cat.comm.rank == 0:
# use bigfile because it allows concurrent write to different datasets.
cat.logger.info("source plane at %g written. " % zs)
def make_kappa_maps(cat, nside, zs_list, ds_list, localsize, nbar):
""" Make kappa maps at a list of ds
Return kappa, Nm in shape of (n_ds, localsize), kappabar in shape of (n_ds,)
The maps are distributed in memory, and localsize is the size of
map on this rank.
"""
dl = (abs(cat['Position'] **2).sum(axis=-1)) ** 0.5
chunks = dl.chunks
ra = cat['RA']
dec = cat['DEC']
zl = (1 / cat['Aemit'] - 1)
ipix = da.apply_gufunc(lambda ra, dec, nside:
healpix.ang2pix(nside, numpy.radians(90-dec), numpy.radians(ra)),
'(),()->()', ra, dec, nside=nside)
npix = healpix.nside2npix(nside)
ipix = ipix.compute()
dl = dl.persist()
cat.comm.barrier()
if cat.comm.rank == 0:
cat.logger.info("ipix and dl are persisted")
area = (4 * numpy.pi / npix) * dl**2
Om = cat.attrs['OmegaM'][0]
kappa_list = []
kappabar_list = []
Nm_list = []
for zs, ds in zip(zs_list, ds_list):
LensKernel = da.apply_gufunc(lambda dl, zl, Om, ds: wlen(Om, dl, zl, ds),
"(), ()-> ()",
dl, zl, Om=Om, ds=ds)
weights = (LensKernel / (area * nbar))
weights = weights.compute()
cat.comm.barrier()
if cat.comm.rank == 0:
cat.logger.info("source plane %g weights are persisted" % zs)
Wmap, Nmap = weighted_map(ipix, npix, weights, localsize, cat.comm)
cat.comm.barrier()
if cat.comm.rank == 0:
cat.logger.info("source plane %g maps generated" % zs)
# compute kappa bar
# this is a simple integral, but we do not know dl, dz relation
# so do it with values from a subsample of particles
every = (cat.csize // 100000)
kappa1 = Wmap
if every == 0: every = 1
# use GatherArray, because it is faster than comm.gather at this scale
# (> 4000 ranks on CrayMPI)
ssdl = GatherArray(dl[::every].compute(), cat.comm)
ssLensKernel = GatherArray(LensKernel[::every].compute(), cat.comm)
if cat.comm.rank == 0:
arg = ssdl.argsort()
ssdl = ssdl[arg]
ssLensKernel = ssLensKernel[arg]
kappa1bar = numpy.trapz(ssLensKernel, ssdl)
else:
kappa1bar = None
kappa1bar = cat.comm.bcast(kappa1bar)
cat.comm.barrier()
if cat.comm.rank == 0:
cat.logger.info("source plane %g bar computed " % zs)
kappa_list.append(kappa1)
kappabar_list.append(kappa1bar)
Nm_list.append(Nmap)
"""
# estimate nbar
dlmin = dl.min()
dlmax = dl.max()
volume = (Nmap > 0).sum() / len(Nmap) * 4 / 3 * numpy.pi * (dlmax**3 - dlmin ** 3)
"""
# returns number rather than delta, since we do not know fsky here.
#Nmap = Nmap / cat.csize * cat.comm.allreduce((Nmap > 0).sum()) # to overdensity.
return numpy.array(kappa_list), numpy.array(kappabar_list), numpy.array(Nm_list)