def train_step(inputs):
x_true, y = inputs
if args.stdinit:
x_init = y[:, 1] / b1eul
if args.diffps:
x_init = x_init + linear_field(
nc, bs, ipkdiff, batch_size=y.shape[0])
elif args.priorinit:
x_init = linear_field(nc, bs, ipklin, batch_size=y.shape[0])
else:
x_init = tf.random.normal(x_true.shape)
y = y[:, 0]
if len(rim.trainable_variables) == 0:
#Hack since sometimes this si the first time RIM is called and so hasn't been inisitalized
i = 0
a, b, c = x_init[i:i + 1], y[i:i + 1], x_true[i:i + 1]
_ = rim(tf.constant(a), tf.constant(b), grad_fn, tf.constant(c),
grad_params)[1] / args.batch_size
#
gradients = [0.] * len(rim.trainable_variables)
#n = args.sims_in_loop
for i in range(args.batch_size // world_size):
with tf.GradientTape() as tape:
a, b, c = x_init[i:i + 1], y[i:i + 1], x_true[i:i + 1]
loss = rim(tf.constant(a), tf.constant(b), grad_fn, tf.constant(c),
grad_params)[1] / args.batch_size
grads = tape.gradient(loss, rim.trainable_variables)
for j in range(len(grads)):
gradients[j] = gradients[j] + grads[j]
optimizer.apply_gradients(zip(gradients, rim.trainable_variables))
return loss
def test_step(inputs):
x_true, y = inputs
#x_init = tf.random.normal(x_true.shape)
if args.stdinit:
x_init = y[:, 1] / b1eul + linear_field(
nc, bs, ipkdiff, batch_size=y.shape[0])
#x_init = y[:, 1]
y = y[:, 0]
elif args.priorinit:
x_init = linear_field(nc, bs, ipklin, batch_size=y.shape[0])
else:
x_init = tf.random.normal(x_true.shape)
x_pred = rim(x_init, y, grad_fn, grad_params)
return x_pred, x_init, x_true, y
def train_step(inputs):
x_true, y = inputs
if len(rim.trainable_variables) == 0:
#Hack since sometimes this si the first time RIM is called and so hasn't been inisitalized
i = 0
b, c = y[i:i+1], x_true[i:i+1]
if args.stdinit:
a = b[:, 1] / b1eul
if args.diffps : a = a + linear_field(nc, bs, ipkdiff, batch_size=b.shape[0])
else: a = tf.random.normal(c.shape)
b = b[:, 0]
try: a, b, c = tf.constant(a), tf.constant(b), tf.constant(c)
except: pass
_ = rim(a, b, grad_fn, c, grad_params)[1] / args.batch_size
#
gradients = [0.]*len(rim.trainable_variables)
for i in range(args.batch_size // world_size):
with tf.GradientTape() as tape:
b, c = y[i:i+1], x_true[i:i+1]
a = tf.random.normal(c.shape)
b = b[:, 0]
try: a, b, c = tf.constant(a), tf.constant(b), tf.constant(c)
except: pass
loss = rim(a, b, grad_fn, c, grad_params)[1] / args.batch_size
grads = tape.gradient(loss, rim.trainable_variables)
for j in range(len(grads)):
gradients[j] = gradients[j] + grads[j]
optimizer.apply_gradients(zip(gradients, rim.trainable_variables))
return loss
def check_2pt(xx, yy, rim, grad_fn, compares, nrim=10, fname=None):
truemesh = [xx[0], yy[0]]
rimpreds = []
for it in range(nrim):
x_init = flowpm.linear_field(nc, bs, ipklin,
batch_size=xx.shape[0]).numpy()
#x_init = np.random.normal(size=xx.size).reshape(xx.shape).astype(np.float32)
#x_init = (yy - (yy.max() - yy.min())/2.)/yy.std() + np.random.normal(size=xx.size).reshape(xx.shape).astype(np.float32)
pred = rim(tf.constant(x_init), tf.constant(yy), grad_fn)[-1]
rimpreds.append([pred[0].numpy(), pm(pred)[0].numpy()])
fig, ax = plt.subplots(1, 2, figsize=(9, 4), sharex=True)
for ip, preds in enumerate(rimpreds):
k, pks = tools.get_ps(preds, truemesh, bs)
for i in range(2):
lbl = None
if ip == 0 and i == 0: lbl = 'Linear'
if ip == 0 and i == 1: lbl = 'Final'
ax[0].plot(k,
pks[i][2] / (pks[i][0] * pks[i][1])**0.5,
'C%d-' % i,
alpha=0.4,
label=lbl)
ax[1].plot(k, (pks[i][0] / pks[i][1])**0.5, 'C%d-' % i, alpha=0.4)
lss = ['-', '--', ':', '-.']
lws = [1, 1, 2, 2]
lbls = ['Adam', 'Adam 10x', 'Best recon']
#for ip, preds in enumerate([pred_adam, pred_adam10]):
for ip, preds in enumerate(compares):
k, pks = tools.get_ps(preds, truemesh, bs)
for i in range(2):
lbl = None
if i == 0: lbl = lbls[ip]
ax[0].plot(k,
pks[i][2] / (pks[i][0] * pks[i][1])**0.5,
'C%d' % i,
ls=lss[ip + 1],
lw=lws[ip + 1])
ax[1].plot(k, (pks[i][0] / pks[i][1])**0.5,
'C%d' % i,
label=lbl,
ls=lss[ip + 1],
lw=lws[ip + 1])
for axis in ax:
axis.semilogx()
axis.grid(which='both')
axis.legend(fontsize=12)
axis.set_xlabel('k(h/Mpc)', fontsize=12)
ax[0].set_ylim(-0.1, 1.2)
ax[1].set_ylim(-0.5, 2.0)
ax[0].set_ylabel('$r_c$', fontsize=12)
ax[1].set_ylabel('$t_f$', fontsize=12)
plt.tight_layout()
if fname is not None: plt.savefig(fname)
else: plt.savefig('rim-2pt.png')
plt.close()
def test_step(inputs):
x_true, y = inputs
if args.stdinit:
x_init = y[:, 1] / b1eul
if args.diffps : x_init = x_init + linear_field(nc, bs, ipkdiff, batch_size=y.shape[0])
else: x_init = tf.random.normal(x_true.shape)
y = y[:, 0]
x_pred = rim(x_init, y, grad_fn, x_true, grad_params)[0]
return x_pred, x_init, x_true, y
def test_save_state():
"""
Tests the BigFile saving function
"""
klin = np.loadtxt('flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
a0 = 0.1
nc = [16, 16, 16]
boxsize = [100., 100., 100.]
cosmo = flowpm.cosmology.Planck15()
initial_conditions = flowpm.linear_field(
nc, # size of the cube
boxsize, # Physical size of the cube
ipklin, # Initial powerspectrum
batch_size=2)
# Sample particles
state = flowpm.lpt_init(cosmo, initial_conditions, a0)
with tempfile.TemporaryDirectory() as tmpdirname:
filename = tmpdirname + '/testsave'
save_state(cosmo, state, a0, nc, boxsize, filename)
# Now try to reload the information using BigFile
bf = bigfile.BigFile(filename)
# Testing recovery of header
header = bf['Header']
assert_allclose(np.array(header.attrs['NC']), np.array(nc))
assert_allclose(np.array(header.attrs['BoxSize']), np.array(boxsize))
assert_allclose(np.array(header.attrs['OmegaCDM']),
np.array(cosmo.Omega_c))
assert_allclose(np.array(header.attrs['OmegaB']),
np.array(cosmo.Omega_b))
assert_allclose(np.array(header.attrs['OmegaK']),
np.array(cosmo.Omega_k))
assert_allclose(np.array(header.attrs['h']), np.array(cosmo.h))
assert_allclose(np.array(header.attrs['Sigma8']),
np.array(cosmo.sigma8))
assert_allclose(np.array(header.attrs['w0']), np.array(cosmo.w0))
assert_allclose(np.array(header.attrs['wa']), np.array(cosmo.wa))
assert_allclose(np.array(header.attrs['Time']), np.array(a0))
# Testing recovery of data
pos = bf['1/Position']
assert_allclose(pos[:], state[0, 1].numpy() / nc[0] * boxsize[0])
vel = bf['1/Velocity']
assert_allclose(vel[:], state[1, 1].numpy() / nc[0] * boxsize[0])
# Closing file
bf.close()
def pm_data_test(self, dummy):
args = self.args
nc, bs = args.nc, args.bs
print("PM graph")
linear = flowpm.linear_field(nc,
bs,
args.ipklin,
batch_size=args.world_size)
base = self.pm(linear)
sample = self.gal_sample(base)
return linear, sample
def pm_data_test(dummy):
print("PM graph")
linear = flowpm.linear_field(nc, bs, ipklin, batch_size=world_size)
if args.nbody:
print('Nobdy sim')
state = lpt_init(linear, a0=a0, order=args.lpt_order)
final_state = nbody(state, stages, nc)
else:
print('ZA/2LPT sim')
final_state = lpt_init(linear, a0=af, order=args.lpt_order)
tfinal_field = cic_paint(tf.zeros_like(linear), final_state[0])
return linear, tfinal_field
def test_step(inputs):
x_true, y = inputs
#x_init = tf.random.normal(x_true.shape)
if args.stdinit:
x_init = y[:, 1] / b1eul + linear_field(
nc, bs, ipkdiff, batch_size=y.shape[0])
#x_init = y[:, 1]
y = y[:, 0]
else:
print('data init')
x_init = y
x_pred = cnn(tf.expand_dims(x_init, -1))[..., 0]
#x_pred = cnn(x_init)
return x_pred, x_init, x_true, y
def train_step(inputs):
x_true, y = inputs
#x_init = tf.random.normal(x_true.shape)
if args.stdinit:
x_init = y[:, 1] / b1eul + linear_field(
nc, bs, ipkdiff, batch_size=y.shape[0])
#x_init = y[:, 1]
y = y[:, 0]
elif args.priorinit:
x_init = linear_field(nc, bs, ipklin, batch_size=y.shape[0])
else:
x_init = tf.random.normal(x_true.shape)
with tf.GradientTape() as tape:
x_pred = rim(x_init, y, grad_fn, grad_params)
res = (x_true - x_pred)
#print(res.shape)
loss = tf.reduce_mean(
tf.square(res),
axis=(0, 2, 3, 4)) ##This is not advised, come back to this
loss = tf.reduce_sum(loss) / args.batch_size
gradients = tape.gradient(loss, rim.trainable_variables)
optimizer.apply_gradients(zip(gradients, rim.trainable_variables))
print(optimizer._decayed_lr(tf.float32))
return loss
def main(_):
cosmology = flowpm.cosmology.Planck15()
# Compute the k vectora that will be needed in the PGD fit
k, _ = flowpm.power_spectrum(tf.zeros([1] + [FLAGS.nc] * 3),
boxsize=np.array([FLAGS.box_size] * 3),
kmin=np.pi / FLAGS.box_size,
dk=2 * np.pi / FLAGS.box_size)
# Create some initial conditions
klin = tf.constant(np.logspace(-4, 1, 512), dtype=tf.float32)
pk = linear_matter_power(cosmology, klin)
pk_fun = lambda x: tf.cast(
tf.reshape(
interpolate.interp_tf(tf.reshape(tf.cast(x, tf.float32), [-1]),
klin, pk), x.shape), tf.complex64)
initial_conditions = flowpm.linear_field(
[FLAGS.nc, FLAGS.nc, FLAGS.nc],
[FLAGS.box_size, FLAGS.box_size, FLAGS.box_size],
pk_fun,
batch_size=FLAGS.batch_size)
initial_state = flowpm.lpt_init(cosmology, initial_conditions,
FLAGS.a_init)
stages = np.linspace(FLAGS.a_init, 1., FLAGS.nsteps, endpoint=True)
print('Starting simulation')
state, scale_factors, pgdparams = fit_nbody(cosmology,
initial_state,
stages,
[FLAGS.nc, FLAGS.nc, FLAGS.nc],
pm_nc_factor=FLAGS.B)
print('Simulation done')
pickle.dump(
{
'B': FLAGS.B,
'nsteps': FLAGS.nsteps,
'params': pgdparams,
'scale_factors': scale_factors,
'cosmology': cosmology.to_dict(),
'boxsize': FLAGS.box_size,
'nc': FLAGS.nc
}, open(FLAGS.filename, "wb"))
def pm_poisson():
print("PM graph")
linear = flowpm.linear_field(nc, bs, ipklin, batch_size=batch_size)
if args.nbody:
print('Nobdy sim')
state = lpt_init(linear, a0=a0, order=args.lpt_order)
final_state = nbody(state, stages, nc)
else:
print('ZA/2LPT sim')
final_state = lpt_init(linear, a0=af, order=args.lpt_order)
tfinal_field = cic_paint(tf.zeros_like(linear), final_state[0])
base = tfinal_field
if Rsm != 0:
basek = r2c3d(tfinal_field, norm=nc**3)
basek = tf.multiply(basek, tf.cast(smwts, tf.complex64))
base = c2r3d(basek, norm=nc**3)
galmean = tfp.distributions.Poisson(rate = plambda * (1 + base))
result = galmean.sample()
return linear, tfinal_field, result, base
def train_step(inputs):
x_true, y = inputs
#x_init = tf.random.normal(x_true.shape)
if args.stdinit:
print('std init')
x_init = y[:, 1] / b1eul + linear_field(
nc, bs, ipkdiff, batch_size=y.shape[0])
#x_init = y[:, 1]
y = y[:, 0]
else:
print('data init')
x_init = y
with tf.GradientTape() as tape:
x_pred = cnn(tf.expand_dims(x_init, -1))[..., 0]
print(x_pred.shape)
res = (x_true - x_pred)
#print(res.shape)
loss = tf.reduce_mean(tf.square(res))
gradients = tape.gradient(loss, cnn.trainable_variables)
optimizer.apply_gradients(zip(gradients, cnn.trainable_variables))
print("learnign rate : ", optimizer._decayed_lr(tf.float32))
print('Len trainable : ', len(cnn.trainable_variables))
return loss
else:
ofolder = './models/L%04d_N%03d/LPT%d%s/' % (bs, nc, args.lpt_order,
suffpath)
try:
os.makedirs(ofolder)
except Exception as e:
print(e)
#######################################
x_test, y_test = testdata[0:1, 0], testdata[0:1, 1:]
x_test = tf.constant(x_test, dtype=tf.float32)
if args.stdinit:
x_init = tf.constant(y_test[:, 1] / b1eul, dtype=tf.float32)
if args.diffps:
x_init = x_init + linear_field(
nc, bs, ipkdiff, batch_size=y_test.shape[0])
elif args.priorinit:
x_init = linear_field(nc, bs, ipklin, batch_size=y_test.shape[0])
else:
x_init = tf.random.normal(x_test.shape)
y_test = tf.constant(y_test[:, 0])
minic, minfin = datamodel.reconstruct(tf.constant(y_test),
bias,
errormesh,
RRs=RRs,
niter=args.rim_iter * 20,
lr=0.5,
x_init=x_init,
useprior=True)
pred_adam, _ = datamodel.reconstruct(tf.constant(y_test),
bias,
def main(_):
mesh_shape = [("row", 2), ("col", 2)]
layout_rules = [("nx_lr", "row"), ("ny_lr", "col"), ("nx", "row"),
("ny", "col"), ("ty_lr", "row"), ("tz_lr", "col"),
("nx_block", "row"), ("ny_block", "col")]
mesh_hosts = ["localhost:%d" % (8222 + j) for j in range(4)]
# Create a cluster from the mesh hosts.
cluster = tf.train.ClusterSpec({
"mesh": mesh_hosts,
"master": ["localhost:8488"]
})
# Create a server for local mesh members
server = tf.train.Server(cluster, job_name="master", task_index=0)
mesh_devices = [
'/job:mesh/task:%d' % i for i in range(cluster.num_tasks("mesh"))
]
print("List of devices", mesh_devices)
mesh_impl = mtf.placement_mesh_impl.PlacementMeshImpl(
mesh_shape, layout_rules, mesh_devices)
# Build the model
# Create computational graphs and some initializations
graph = mtf.Graph()
mesh = mtf.Mesh(graph, "nbody_mesh")
# Compute a few things first, using simple tensorflow
a0 = FLAGS.a0
a = FLAGS.af
nsteps = FLAGS.nsteps
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
#pt = PerturbationGrowth(cosmology, a=[a], a_normalize=1.0)
# Generate a batch of 3D initial conditions
initial_conditions = flowpm.linear_field(
FLAGS.nc, # size of the cube
FLAGS.box_size, # Physical size of the cube
ipklin, # Initial power spectrum
batch_size=FLAGS.batch_size)
state = lpt_init(initial_conditions, a0=a0, order=1)
#final_state = state
final_state = nbody(state, stages, nc)
tfinal_field = cic_paint(tf.zeros_like(initial_conditions), final_state[0])
# Compute necessary Fourier kernels
kvec = flowpm.kernels.fftk((nc, nc, nc), symmetric=False)
from flowpm.kernels import laplace_kernel, gradient_kernel
lap = tf.cast(laplace_kernel(kvec), tf.complex64)
grad_x = gradient_kernel(kvec, 0)
grad_y = gradient_kernel(kvec, 1)
grad_z = gradient_kernel(kvec, 2)
derivs = [lap, grad_x, grad_y, grad_z]
mesh_final_field = lpt_prototype(mesh,
initial_conditions,
derivs,
bs=FLAGS.box_size,
nc=FLAGS.nc,
batch_size=FLAGS.batch_size)
# Lower mesh computation
lowering = mtf.Lowering(graph, {mesh: mesh_impl})
# Retrieve output of computation
result = lowering.export_to_tf_tensor(mesh_final_field)
with tf.Session(server.target,
config=tf.ConfigProto(allow_soft_placement=True,
log_device_placement=False)) as sess:
a, b, c = sess.run([initial_conditions, tfinal_field, result])
np.save('init', a)
np.save('reference_final', b)
np.save('mesh_pyramid', c)
plt.figure(figsize=(15, 3))
plt.subplot(141)
plt.imshow(a[0].sum(axis=2))
plt.title('Initial Conditions')
plt.subplot(142)
plt.imshow(b[0].sum(axis=2))
plt.title('TensorFlow (single GPU)')
plt.colorbar()
plt.subplot(143)
plt.imshow(c[0].sum(axis=2))
plt.title('Mesh TensorFlow Single')
plt.colorbar()
plt.subplot(144)
plt.imshow((b[0] - c[0]).sum(axis=2))
plt.title('Residuals')
plt.colorbar()
plt.savefig("comparison-single.png")
exit(0)
def test_convergence_Born(return_results=False):
""" This function tests that given a set of density planes,
both lenstools and flowpm recover the same convergence maps in
angular coordinates.
"""
klin = np.loadtxt(data_path + '/flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt(data_path + '/flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
cosmo = flowpm.cosmology.Planck15()
a0 = 0.9
# Create a state vector
initial_conditions = flowpm.linear_field([nc, nc, 10 * nc],
[bs, bs, 10 * bs],
ipklin,
batch_size=2)
state = flowpm.lpt_init(cosmo, initial_conditions, a0)
r = tf.linspace(0., 10 * bs, 11)
r_center = 0.5 * (r[1:] + r[:-1])
a_center = flowpm.background.a_of_chi(cosmo, r_center)
constant_factor = 3 / 2 * cosmo.Omega_m * (constants.H0 / constants.c)**2
# To make it convenient to access simulation properties in lenstools
# let's quicly export and reload the sim
# TODO: remove the need for this!
flowpm.io.save_state(cosmo,
state,
a0, [nc, nc, 10 * nc], [bs, bs, 10 * bs],
'snapshot_born_testing',
attrs={'comoving_distance': r_center[0]})
# Reload the snapshot with lenstools
snapshot = FlowPMSnapshot.open('snapshot_born_testing')
# Get some density planes and create lenstool tracer
lensplanes = []
tracer = lt.simulations.RayTracer(lens_type=lt.simulations.DensityPlane)
for i in range(len(r_center)):
plane = flowpm.raytracing.density_plane(
state, [nc, nc, 10 * nc],
r_center[i] / bs * nc,
width=nc,
plane_resolution=plane_resolution)
r, a, p = r_center[i], a_center[i], plane[0]
lensplanes.append((r, a, plane))
density_normalization = bs * r / a
# We upsample the lensplanes before giving them to lenstools because
# lentools is using a weird kind of interpolation when converting from
# comoving coordinates to angular coords. with a larger
p = tf.image.resize(
tf.reshape(p, [1, plane_resolution, plane_resolution, 1]),
[2048, 2048])
p = (p[0, :, :, 0] * constant_factor * density_normalization).numpy()
p = p - np.mean(p)
lt_plane = lt.simulations.DensityPlane(
p,
angle=snapshot.header["box_size"],
redshift=1 / a - 1,
cosmology=snapshot.cosmology)
tracer.addLens(lt_plane)
# Adding dummy lensplane at the end
tracer.addLens(
lt.simulations.DensityPlane(np.zeros((2048, 2048)),
angle=snapshot.header["box_size"],
redshift=0.99,
cosmology=snapshot.cosmology))
tracer.addLens(
lt.simulations.DensityPlane(np.zeros((2048, 2048)),
angle=snapshot.header["box_size"],
redshift=2,
cosmology=snapshot.cosmology))
tracer.reorderLenses()
# Create an array of coordinates at which to retrieve the convernge maps
xgrid, ygrid = np.meshgrid(
np.linspace(0, field, npix, endpoint=False), # range of X coordinates
np.linspace(0, field, npix, endpoint=False)) # range of Y coordinates
coords = np.stack([xgrid, ygrid], axis=0) * u.deg
c = coords.reshape([2, -1]).T
# Compute convergence map with lenstool
lt_map = tracer.convergenceBorn(coords, z=1.0)
# Compute convergemce map with flowpm
fpm_map = flowpm.raytracing.convergenceBorn(cosmo,
lensplanes,
bs / nc,
bs,
c.to(u.rad),
z_source=tf.ones([1]),
field_npix=npix)
# Comparing the final maps
assert_allclose(lt_map,
fpm_map[0].numpy().reshape([npix, npix, -1])[:, :, -1],
atol=5e-4)
if return_results:
return lt_map, fpm_map
def main():
"""
Model function for the CosmicRIM.
"""
if args.parallel: rim = build_rim_parallel(params)
else: rim = build_rim_split(params)
grad_fn = recon_dm_grad
#
#
# train_dataset = tf.data.Dataset.range(args.batch_in_epoch)
# train_dataset = train_dataset.map(pm_data)
# # dset = dset.apply(tf.data.experimental.unbatch())
# train_dataset = train_dataset.prefetch(-1)
# test_dataset = tf.data.Dataset.range(1).map(pm_data_test).prefetch(-1)
#
traindata, testdata = get_data()
idx = np.random.randint(0, traindata.shape[0], 1)
xx, yy = traindata[idx,
0].astype(np.float32), traindata[idx,
1].astype(np.float32),
x_init = flowpm.linear_field(nc, bs, ipklin, batch_size=xx.shape[0])
#x_init = np.random.normal(size=xx.size).reshape(xx.shape).astype(np.float32)
x_pred = rim(x_init, yy, grad_fn)
#
# @tf.function
def rim_train(x_true, x_init, y):
with tf.GradientTape() as tape:
x_pred = rim(x_init, y, grad_fn)
res = (x_true - x_pred)
loss = tf.reduce_mean(tf.square(res))
gradients = tape.gradient(loss, rim.trainable_variables)
return loss, gradients
##Train and save
piter, testiter = 10, 50
losses = []
lrs = [0.0001, 0.0001]
liters = [1001, 2001]
trainiter = 0
start = time.time()
x_test, y_test = None, None
for il in range(len(lrs)):
print('Learning rate = %0.3e' % lrs[il])
opt = tf.keras.optimizers.Adam(learning_rate=lrs[il])
for i in range(liters[il]):
idx = np.random.randint(0, traindata.shape[0], args.batch_size)
xx, yy = traindata[idx, 0].astype(
np.float32), traindata[idx, 1].astype(np.float32),
x_init = flowpm.linear_field(nc,
bs,
ipklin,
batch_size=xx.shape[0]).numpy()
#x_init = np.random.normal(size=xx.size).reshape(xx.shape).astype(np.float32)
#x_init = (yy - (yy.max() - yy.min())/2.)/yy.std() + np.random.normal(size=xx.size).reshape(xx.shape).astype(np.float32)
loss, gradients = rim_train(x_true=tf.constant(xx),
x_init=tf.constant(x_init),
y=tf.constant(yy))
losses.append(loss.numpy())
opt.apply_gradients(zip(gradients, rim.trainable_variables))
if i % piter == 0:
print("Time taken for %d iterations : " % piter,
time.time() - start)
print("Loss at iteration %d : " % i, losses[-1])
start = time.time()
if i % testiter == 0:
plt.plot(losses)
plt.savefig(ofolder + 'losses.png')
plt.close()
##check 2pt and comapre to Adam
#idx = np.random.randint(0, testdata.shape[0], 1)
#xx, yy = testdata[idx, 0].astype(np.float32), testdata[idx, 1].astype(np.float32),
if x_test is None:
idx = np.random.randint(0, testdata.shape[0], 1)
x_test, y_test = testdata[idx, 0].astype(
np.float32), testdata[idx, 1].astype(np.float32),
x_init = flowpm.linear_field(
nc, bs, ipklin, batch_size=x_test.shape[0]).numpy()
pred_adam = adam(tf.constant(x_init), tf.constant(y_test),
grad_fn)
pred_adam = [
pred_adam[0].numpy(),
pm(pred_adam)[0].numpy()
]
pred_adam10 = adam10(tf.constant(x_init),
tf.constant(y_test), grad_fn)
pred_adam10 = [
pred_adam10[0].numpy(),
pm(pred_adam10)[0].numpy()
]
minic, minfin = fid_recon.reconstruct(tf.constant(y_test),
RRs=[1.0, 0.0],
niter=args.rim_iter *
10,
lr=0.1)
compares = [pred_adam, pred_adam10, [minic[0], minfin[0]]]
print('Test set generated')
#x_init = np.random.normal(size=x_test.size).reshape(x_test.shape).astype(np.float32)
x_init = flowpm.linear_field(
nc, bs, ipklin, batch_size=x_test.shape[0]).numpy()
#x_init = (y_test - (y_test.max() - y_test.min())/2.)/y_test.std() + np.random.normal(size=x_test.size).reshape(x_test.shape).astype(np.float32)
pred = rim(tf.constant(x_init), tf.constant(y_test),
grad_fn)[-1]
check_im(x_test[0],
x_init[0],
pred.numpy()[0],
fname=ofolder + 'rim-im-%04d.png' % trainiter)
check_2pt(x_test,
y_test,
rim,
grad_fn,
compares,
fname=ofolder + 'rim-2pt-%04d.png' % trainiter)
rim.save_weights(ofolder + '/%d' % trainiter)
trainiter += 1
def main(_):
dtype=tf.float32
startw = time.time()
tf.random.set_random_seed(100)
np.random.seed(100)
# Compute a few things first, using simple tensorflow
a0=FLAGS.a0
a=FLAGS.af
nsteps=FLAGS.nsteps
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc, FLAGS.box_size, ipklin, batch_size=1, seed=100, dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
################################################################
tf.reset_default_graph()
print('ic constructed')
noise = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(np.float32)
data_noised = fin + noise
data = data_noised
minimum = data.copy()
start = noise.copy().flatten().astype(np.float32)
Rsm = tf.placeholder(tf.float32, name='smoothing')
def recon_prototype(linear):
"""
"""
linear = tf.reshape(linear, minimum.shape)
#loss = tf.reduce_sum(tf.square(linear - minimum))
state = lpt_init(linear, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
final_field = cic_paint(tf.zeros_like(linear), final_state[0])
residual = final_field - data.astype(np.float32)
base = residual
## Rsmsq = tf.multiply(Rsm*bs/nc, Rsm*bs/nc)
## smwts = tf.exp(tf.multiply(-kmesh**2, Rsmsq))
## basek = r2c3d(base, norm=nc**3)
## basek = tf.multiply(basek, tf.cast(smwts, tf.complex64))
## base = c2r3d(basek, norm=nc**3)
#### #
chisq = tf.multiply(base, base)
chisq = tf.reduce_sum(chisq)
chisq = tf.multiply(chisq, 1/nc**3, name='chisq')
#Prior
lineark = r2c3d(linear, norm=nc**3)
priormesh = tf.square(tf.cast(tf.abs(lineark), tf.float32))
prior = tf.reduce_sum(tf.multiply(priormesh, 1/priorwt))
prior = tf.multiply(prior, 1/nc**3, name='prior')
#
loss = chisq + prior
return loss
@tf.function
def min_lbfgs():
return tfp.optimizer.lbfgs_minimize(
make_val_and_grad_fn(recon_prototype),
initial_position=tf.constant(start),
tolerance=1e-5,
max_iterations=50)
with tf.Session() as sess:
#results = sess.run(min_lbfgs(), {Rsm:4})
results = sess.run(min_lbfgs())
print(results)
minimum = results.position
print(minimum)
tf.reset_default_graph()
print('\nminimized\n')
tfic = linear_field(FLAGS.nc, FLAGS.box_size, ipklin, batch_size=1, seed=100, dtype=dtype)*0 + minimum.reshape(data_noised.shape)
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
minic, minfin = sess.run([tfic, tfinal_field])
dg.saveimfig(0, [minic, minfin], [ic, fin], fpath+'')
dg.save2ptfig(0, [minic, minfin], [ic, fin], fpath+'', bs)
##
exit(0)
def test_density_plane(return_results=False):
""" Tests cutting density planes from snapshots against lenstools
"""
klin = np.loadtxt(data_path + '/flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt(data_path + '/flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
cosmo = flowpm.cosmology.Planck15()
a0 = 0.9
r0 = flowpm.background.rad_comoving_distance(cosmo, a0)
# Create a state vector
initial_conditions = flowpm.linear_field(nc, bs, ipklin, batch_size=2)
state = flowpm.lpt_init(cosmo, initial_conditions, a0)
# Export the snapshot
flowpm.io.save_state(cosmo,
state,
a0, [nc, nc, nc], [bs, bs, bs],
'snapshot_density_testing',
attrs={'comoving_distance': r0})
# Reload the snapshot with lenstools
snapshot = FlowPMSnapshot.open('snapshot_density_testing')
# Cut a lensplane in the middle of the volume
lt_plane, resolution, NumPart = snapshot.cutPlaneGaussianGrid(
normal=2,
plane_resolution=plane_resolution,
center=(bs / 2) * snapshot.Mpc_over_h,
thickness=(bs / 4) * snapshot.Mpc_over_h,
left_corner=np.zeros(3) * snapshot.Mpc_over_h,
smooth=None,
kind='density')
# Cut the same lensplane with flowpm
fpm_plane = flowpm.raytracing.density_plane(
state,
nc,
center=nc / 2,
width=nc / 4,
plane_resolution=plane_resolution)
# Apply additional normalization terms to match lenstools definitions
constant_factor = 3 / 2 * cosmo.Omega_m * (constants.H0 / constants.c)**2
density_normalization = bs / 4 * r0 / a0
fpm_plane = fpm_plane * density_normalization * constant_factor
# Checking first the mean value, which accounts for any normalization
# issues
assert_allclose(np.mean(fpm_plane[0]), np.mean(lt_plane), rtol=1e-5)
# To check pixelwise difference, we need to do some smoothing as lenstools and
# flowpm use different painting kernels
smooth_lt_plane = np.fft.ifft2(fourier_gaussian(np.fft.fft2(lt_plane),
3)).real
smooth_fpm_plane = np.fft.ifft2(
fourier_gaussian(np.fft.fft2(fpm_plane[0]), 3)).real
assert_allclose(smooth_fpm_plane, smooth_lt_plane, rtol=2e-2)
if return_results:
return fpm_plane, lt_plane, smooth_fpm_plane, smooth_lt_plane
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
#tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
################################################################
#tf.reset_default_graph()
def main(_):
infield = True
mesh_shape = mtf.convert_to_shape(FLAGS.mesh_shape)
startw = time.time()
print(mesh_shape)
#layout_rules = mtf.convert_to_layout_rules(FLAGS.layout)
#mesh_shape = [("row", FLAGS.nx), ("col", FLAGS.ny)]
layout_rules = [("nx_lr", "row"), ("ny_lr", "col"), ("nx", "row"),
("ny", "col"), ("ty", "row"), ("tz", "col"),
("ty_lr", "row"), ("tz_lr", "col"), ("nx_block", "row"),
("ny_block", "col")]
# Resolve the cluster from SLURM environment
cluster = tf.distribute.cluster_resolver.SlurmClusterResolver(
{"mesh": mesh_shape.size // FLAGS.gpus_per_task},
port_base=8822,
gpus_per_node=FLAGS.gpus_per_node,
gpus_per_task=FLAGS.gpus_per_task,
tasks_per_node=FLAGS.tasks_per_node)
cluster_spec = cluster.cluster_spec()
print(cluster_spec)
# Create a server for all mesh members
server = tf.distribute.Server(cluster_spec, "mesh", cluster.task_id)
print(server)
if cluster.task_id > 0:
server.join()
# Otherwise we are the main task, let's define the devices
devices = [
"/job:mesh/task:%d/device:GPU:%d" % (i, j)
for i in range(cluster_spec.num_tasks("mesh"))
for j in range(FLAGS.gpus_per_task)
]
print("List of devices", devices)
mesh_impl = mtf.placement_mesh_impl.PlacementMeshImpl(
mesh_shape, layout_rules, devices)
##Begin here
klin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
#If initc, run normal flowpm to generate data
tf.reset_default_graph()
if infield:
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
start = time.time()
with tf.Session(server.target) as sess:
ic, fin = sess.run([tfic, tfinal_field])
print("\nTime taken for the vanilla flowpm thingy :\n ",
time.time() - start)
else:
ic = None
tf.reset_default_graph()
print('ic constructed')
graph = mtf.Graph()
mesh = mtf.Mesh(graph, "my_mesh")
initial_conditions, final_field, input_field = nbody_prototype(
mesh, infield, nc=FLAGS.nc, batch_size=FLAGS.batch_size)
# Lower mesh computation
start = time.time()
lowering = mtf.Lowering(graph, {mesh: mesh_impl})
restore_hook = mtf.MtfRestoreHook(lowering)
end = time.time()
print('\n Time for lowering : %f \n' % (end - start))
tf_initc = lowering.export_to_tf_tensor(initial_conditions)
tf_final = lowering.export_to_tf_tensor(final_field)
nc = FLAGS.nc
with tf.Session(server.target) as sess:
start = time.time()
if infield:
ic_check, fin_check = sess.run([tf_initc, tf_final],
feed_dict={input_field: ic})
else:
ic_check, fin_check = sess.run([tf_initc, tf_final])
ic, fin = ic_check, fin_check
print('\n Time for the mesh run : %f \n' % (time.time() - start))
plt.figure(figsize=(15, 3))
plt.subplot(141)
plt.imshow(ic_check[0].sum(axis=2))
plt.title('Initial Conditions')
plt.subplot(142)
plt.imshow(fin[0].sum(axis=2))
plt.title('TensorFlow (single GPU)')
plt.colorbar()
plt.subplot(143)
plt.imshow(fin_check[0].sum(axis=2))
plt.title('Mesh TensorFlow')
plt.colorbar()
plt.subplot(144)
plt.imshow((fin_check[0] - fin[0]).sum(axis=2))
plt.title('Residuals')
plt.colorbar()
plt.savefig("comparison_mesh.png")
exit(0)
##
exit(0)
def main(_):
cosmology = flowpm.cosmology.Planck15()
# Create a simple Planck15 cosmology without neutrinos, and makes sure sigma8
# is matched
nbdykit_cosmo = Cosmology.from_astropy(Planck15.clone(m_nu=0 * u.eV))
nbdykit_cosmo = nbdykit_cosmo.match(sigma8=cosmology.sigma8.numpy())
# Compute the k vectora that will be needed in the PGD fit
k, _ = flowpm.power_spectrum(tf.zeros([1] + [FLAGS.nc] * 3),
boxsize=np.array([FLAGS.box_size] * 3),
kmin=np.pi / FLAGS.box_size,
dk=2 * np.pi / FLAGS.box_size)
# Create some initial conditions
klin = tf.constant(np.logspace(-4, 1, 512), dtype=tf.float32)
pk = linear_matter_power(cosmology, klin)
pk_fun = lambda x: tf.cast(
tf.reshape(
interpolate.interp_tf(tf.reshape(tf.cast(x, tf.float32), [-1]),
klin, pk), x.shape), tf.complex64)
initial_conditions = flowpm.linear_field(
[FLAGS.nc, FLAGS.nc, FLAGS.nc],
[FLAGS.box_size, FLAGS.box_size, FLAGS.box_size],
pk_fun,
batch_size=FLAGS.batch_size)
initial_state = flowpm.lpt_init(cosmology, initial_conditions,
FLAGS.a_init)
stages = np.linspace(FLAGS.a_init, 1., FLAGS.nsteps, endpoint=True)
print('Starting simulation')
# Run the Nbody
states = flowpm.nbody(cosmology,
initial_state,
stages, [FLAGS.nc, FLAGS.nc, FLAGS.nc],
pm_nc_factor=FLAGS.B,
return_intermediate_states=True)
print('Simulation done')
# Initialize PGD params
alpha = tf.Variable([FLAGS.alpha0], dtype=tf.float32)
scales = tf.Variable([FLAGS.kl0, FLAGS.ks0], dtype=tf.float32)
optimizer = tf.keras.optimizers.Adam(learning_rate=FLAGS.learning_rate)
params = []
scale_factors = []
# We begin by fitting the last time step
for j, (a, state) in enumerate(states[::-1]):
# Let's compute the target power spectrum at that scale factor
target_pk = HalofitPower(nbdykit_cosmo,
1. / a - 1.)(k).astype('float32')
for i in range(FLAGS.niter if j == 0 else FLAGS.niter_refine):
optimizer.minimize(
partial(pgd_loss, alpha, scales, state, target_pk), [alpha] if
(FLAGS.fix_scales and j > 0) else [alpha, scales])
if i % 10 == 0:
loss, pk = pgd_loss(alpha,
scales,
state,
target_pk,
return_pk=True)
if i == 0:
pk0 = pk
print("step %d, loss:" % i, loss)
params.append(np.concatenate([alpha.numpy(), scales.numpy()]))
scale_factors.append(a)
print("Fitted params (alpha, kl, ks)", params[-1])
plt.loglog(k, target_pk, "k")
plt.loglog(k, pk0, ':', label='starting')
plt.loglog(k, pk, '--', label='after n steps')
plt.grid(which='both')
plt.savefig('PGD_fit_%0.2f.png' % a)
plt.close()
pickle.dump(
{
'B': FLAGS.B,
'nsteps': FLAGS.nsteps,
'params': params,
'scale_factors': scale_factors,
'cosmology': cosmology.to_dict(),
'boxsize': FLAGS.box_size,
'nc': FLAGS.nc
}, open(FLAGS.filename, "wb"))
def benchmark_model(mesh):
"""
Initializes a 3D volume with random noise, and execute a forward FFT
"""
# Setup parameters
bs = FLAGS.box_size
nc = FLAGS.cube_size
batch_size = FLAGS.batch_size
a0 = FLAGS.a0
a = 1.0
nsteps = FLAGS.pm_steps
# Compute a few things first, using simple tensorflow
klin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
# Initialize the integration steps
stages = np.linspace(FLAGS.a0, 1.0, FLAGS.pm_steps, endpoint=True)
# Generate a batch of 3D initial conditions
initial_conditions = flowpm.linear_field(
nc, # size of the cube
bs, # Physical size of the cube
ipklin, # Initial power spectrum
batch_size=batch_size)
# Compute necessary Fourier kernels
kvec = flowpm.kernels.fftk((nc, nc, nc), symmetric=False)
from flowpm.kernels import laplace_kernel, gradient_kernel
lap = tf.cast(laplace_kernel(kvec), tf.complex64)
grad_x = gradient_kernel(kvec, 0)
grad_y = gradient_kernel(kvec, 1)
grad_z = gradient_kernel(kvec, 2)
# Define the named dimensions
# Parameters of the small scales decomposition
n_block_x = 8
n_block_y = 4
n_block_z = 1
halo_size = 4
# Parameters of the large scales decomposition
downsampling_factor = 2
lnc = nc // 2**downsampling_factor
fx_dim = mtf.Dimension("nx", nc)
fy_dim = mtf.Dimension("ny", nc)
fz_dim = mtf.Dimension("nz", nc)
tfx_dim = mtf.Dimension("tx", nc)
tfy_dim = mtf.Dimension("ty", nc)
tfz_dim = mtf.Dimension("tz", nc)
# Dimensions of the low resolution grid
tx_dim = mtf.Dimension("tx_lr", nc)
ty_dim = mtf.Dimension("ty_lr", nc)
tz_dim = mtf.Dimension("tz_lr", nc)
nx_dim = mtf.Dimension('nx_block', n_block_x)
ny_dim = mtf.Dimension('ny_block', n_block_y)
nz_dim = mtf.Dimension('nz_block', n_block_z)
sx_dim = mtf.Dimension('sx_block', nc // n_block_x)
sy_dim = mtf.Dimension('sy_block', nc // n_block_y)
sz_dim = mtf.Dimension('sz_block', nc // n_block_z)
batch_dim = mtf.Dimension("batch", batch_size)
pk_dim = mtf.Dimension("npk", len(plin))
pk = mtf.import_tf_tensor(mesh, plin.astype('float32'), shape=[pk_dim])
# Compute necessary Fourier kernels
kvec = flowpm.kernels.fftk((nc, nc, nc), symmetric=False)
kx = mtf.import_tf_tensor(mesh,
kvec[0].squeeze().astype('float32'),
shape=[tfx_dim])
ky = mtf.import_tf_tensor(mesh,
kvec[1].squeeze().astype('float32'),
shape=[tfy_dim])
kz = mtf.import_tf_tensor(mesh,
kvec[2].squeeze().astype('float32'),
shape=[tfz_dim])
kv = [ky, kz, kx]
kvec_lr = flowpm.kernels.fftk([nc, nc, nc], symmetric=False)
kx_lr = mtf.import_tf_tensor(mesh,
kvec_lr[0].squeeze().astype('float32'),
shape=[tx_dim])
ky_lr = mtf.import_tf_tensor(mesh,
kvec_lr[1].squeeze().astype('float32'),
shape=[ty_dim])
kz_lr = mtf.import_tf_tensor(mesh,
kvec_lr[2].squeeze().astype('float32'),
shape=[tz_dim])
kv_lr = [ky_lr, kz_lr, kx_lr]
# kvec for high resolution blocks
shape = [batch_dim, fx_dim, fy_dim, fz_dim]
lr_shape = [batch_dim, fx_dim, fy_dim, fz_dim]
hr_shape = [batch_dim, nx_dim, ny_dim, nz_dim, sx_dim, sy_dim, sz_dim]
part_shape = [batch_dim, fx_dim, fy_dim, fz_dim]
initc = mtfpm.linear_field(mesh, shape, bs, nc, pk, kv)
state = mtfpm.lpt_init_single(
initc,
a0,
kv_lr,
halo_size,
lr_shape,
hr_shape,
part_shape[1:],
antialias=True,
)
#state = mtfpm.lpt_init(low, high, 0.1, kv_lr, kv_hr, halo_size, hr_shape, lr_shape,
# part_shape[1:], downsampling_factor=downsampling_factor, antialias=True,)
# Here we can run our nbody
final_state = state #mtfpm.nbody(state, stages, lr_shape, hr_shape, kv_lr, kv_hr, halo_size, downsampling_factor=downsampling_factor)
# paint the field
final_field = mtf.zeros(mesh, shape=hr_shape)
for block_size_dim in hr_shape[-3:]:
final_field = mtf.pad(final_field, [halo_size, halo_size],
block_size_dim.name)
final_field = mesh_utils.cic_paint(final_field, final_state[0], halo_size)
# Halo exchange
for blocks_dim, block_size_dim in zip(hr_shape[1:4], final_field.shape[-3:]):
final_field = mpm.halo_reduce(final_field, blocks_dim, block_size_dim,
halo_size)
# Remove borders
for block_size_dim in hr_shape[-3:]:
final_field = mtf.slice(final_field, halo_size, block_size_dim.size,
block_size_dim.name)
#final_field = mtf.reshape(final_field, [batch_dim, fx_dim, fy_dim, fz_dim])
# Hack usisng custom reshape because mesh is pretty dumb
final_field = mtf.slicewise(lambda x: x[:, 0, 0, 0], [final_field],
output_dtype=tf.float32,
output_shape=[batch_dim, fx_dim, fy_dim, fz_dim],
name='my_dumb_reshape',
splittable_dims=part_shape[:-1] + hr_shape[:4])
return mtf.reduce_sum(final_field)
def main(_):
dtype = tf.float32
startw = time.time()
tf.random.set_random_seed(100)
np.random.seed(100)
# Compute a few things first, using simple tensorflow
a0 = FLAGS.a0
a = FLAGS.af
nsteps = FLAGS.nsteps
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
tf.reset_default_graph()
print('ic constructed')
linear, final_field, update_ops, loss, chisq, prior, Rsm = recon_prototype(
fin)
#initial_conditions = recon_prototype(mesh, fin, nc=FLAGS.nc, batch_size=FLAGS.batch_size, dtype=dtype)
# Lower mesh computation
with tf.Session() as sess:
#ic_check, fin_check = sess.run([tf_initc, tf_final])
#sess.run(tf_linear_op, feed_dict={input_field:ic})
#ic_check, fin_check = sess.run([linear, final_field])
#dg.saveimfig('-check', [ic_check, fin_check], [ic, fin], fpath)
#dg.save2ptfig('-check', [ic_check, fin_check], [ic, fin], fpath, bs)
#sess.run(tf_linear_op, feed_dict={input_field:np.random.normal(size=ic.size).reshape(ic.shape)})
sess.run(tf.global_variables_initializer())
ic0, fin0 = sess.run([linear, final_field])
dg.saveimfig('-init', [ic0, fin0], [ic, fin], fpath)
start = time.time()
titer = 20
niter = 201
iiter = 0
start0 = time.time()
RRs = [4, 2, 1, 0.5, 0]
lrs = np.array([0.1, 0.1, 0.1, 0.1, 0.1]) * 2
#lrs = [0.1, 0.05, 0.01, 0.005, 0.001]
for iR, zlR in enumerate(zip(RRs, lrs)):
RR, lR = zlR
for ff in [fpath + '/figs-R%02d' % (10 * RR)]:
try:
os.makedirs(ff)
except Exception as e:
print(e)
for i in range(niter):
iiter += 1
sess.run(update_ops, {Rsm: RR})
print(sess.run([loss, chisq, prior], {Rsm: RR}))
if (i % titer == 0):
end = time.time()
print('Iter : ', i)
print('Time taken for %d iterations: ' % titer,
end - start)
start = end
##
#ic1, fin1, cc, pp = sess.run([tf_initc, tf_final, tf_chisq, tf_prior], {R0:RR})
#ic1, fin1, cc, pp = sess.run([tf_initc, tf_final, tf_chisq, tf_prior], {R0:RR})
ic1, fin1 = sess.run([linear, final_field])
#print('Chisq and prior are : ', cc, pp)
dg.saveimfig(i, [ic1, fin1], [ic, fin],
fpath + '/figs-R%02d' % (10 * RR))
dg.save2ptfig(i, [ic1, fin1], [ic, fin],
fpath + '/figs-R%02d' % (10 * RR), bs)
dg.saveimfig(i * (iR + 1), [ic1, fin1], [ic, fin], fpath + '/figs')
dg.save2ptfig(i * (iR + 1), [ic1, fin1], [ic, fin],
fpath + '/figs', bs)
ic1, fin1 = sess.run([linear, final_field])
print('Total time taken for %d iterations is : ' % iiter,
time.time() - start0)
dg.saveimfig(i, [ic1, fin1], [ic, fin], fpath)
dg.save2ptfig(i, [ic1, fin1], [ic, fin], fpath, bs)
np.save(fpath + 'ic_recon', ic1)
np.save(fpath + 'final_recon', fin1)
print('Total wallclock time is : ', time.time() - start0)
##
exit(0)
def main(_):
mesh_shape = [("row", FLAGS.nx), ("col", FLAGS.ny)]
layout_rules = [("nx_lr", "row"), ("ny_lr", "col"), ("nx", "row"),
("ny", "col"), ("ty_lr", "row"), ("tz_lr", "col"),
("nx_block", "row"), ("ny_block", "col")]
mesh_impl = HvdSimdMeshImpl(mtf.convert_to_shape(mesh_shape),
mtf.convert_to_layout_rules(layout_rules))
# Build the model
# Create computational graphs and some initializations
graph = mtf.Graph()
mesh = mtf.Mesh(graph, "nbody_mesh")
# Compute a few things first, using simple tensorflow
a0 = FLAGS.a0
a = FLAGS.af
nsteps = FLAGS.nsteps
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
#pt = PerturbationGrowth(cosmology, a=[a], a_normalize=1.0)
# Generate a batch of 3D initial conditions
initial_conditions = flowpm.linear_field(
FLAGS.nc, # size of the cube
FLAGS.box_size, # Physical size of the cube
ipklin, # Initial power spectrum
batch_size=FLAGS.batch_size)
cosmo = flowpm.cosmology.Planck15()
state = lpt_init(cosmo, initial_conditions, a, order=1)
final_state = state
#final_state = nbody(cosmo, state, stages, nc)
tfinal_field = cic_paint(tf.zeros_like(initial_conditions), final_state[0])
# Compute necessary Fourier kernels
kvec = flowpm.kernels.fftk((nc, nc, nc), symmetric=False)
from flowpm.kernels import laplace_kernel, gradient_kernel
lap = tf.cast(laplace_kernel(kvec), tf.complex64)
grad_x = gradient_kernel(kvec, 0)
grad_y = gradient_kernel(kvec, 1)
grad_z = gradient_kernel(kvec, 2)
derivs = [lap, grad_x, grad_y, grad_z]
mesh_final_field = lpt_prototype(mesh,
initial_conditions,
derivs,
bs=FLAGS.box_size,
nc=FLAGS.nc,
batch_size=FLAGS.batch_size)
# Lower mesh computation
lowering = mtf.Lowering(graph, {mesh: mesh_impl})
# Retrieve output of computation
result = lowering.export_to_tf_tensor(mesh_final_field)
with tf.Session() as sess:
a, b, c = sess.run([initial_conditions, tfinal_field, result])
if comm.rank == 0:
np.save('init', a)
np.save('reference_final', b)
np.save('mesh_pyramid', c)
plt.figure(figsize=(15, 3))
plt.subplot(141)
plt.imshow(a[0].sum(axis=2))
plt.title('Initial Conditions')
plt.subplot(142)
plt.imshow(b[0].sum(axis=2))
plt.title('TensorFlow (single GPU)')
plt.colorbar()
plt.subplot(143)
plt.imshow(c[0].sum(axis=2))
plt.title('Mesh TensorFlow Single')
plt.colorbar()
plt.subplot(144)
plt.imshow((b[0] - c[0]).sum(axis=2))
plt.title('Residuals')
plt.colorbar()
plt.savefig("comparison-single.png")
exit(0)
def main(_):
dtype = tf.float32
mesh_shape = mtf.convert_to_shape(FLAGS.mesh_shape)
print(mesh_shape)
#layout_rules = mtf.convert_to_layout_rules(FLAGS.layout)
#mesh_shape = [("row", FLAGS.nx), ("col", FLAGS.ny)]
layout_rules = [("nx_lr", "row"), ("ny_lr", "col"), ("nx", "row"),
("ny", "col"), ("ty", "row"), ("tz", "col"),
("ty_lr", "row"), ("tz_lr", "col"), ("nx_block", "row"),
("ny_block", "col")]
# Resolve the cluster from SLURM environment
cluster = tf.distribute.cluster_resolver.SlurmClusterResolver(
{"mesh": mesh_shape.size // FLAGS.gpus_per_task},
port_base=8822,
gpus_per_node=FLAGS.gpus_per_node,
gpus_per_task=FLAGS.gpus_per_task,
tasks_per_node=FLAGS.tasks_per_node)
cluster_spec = cluster.cluster_spec()
print(cluster_spec)
# Create a server for all mesh members
server = tf.distribute.Server(cluster_spec, "mesh", cluster.task_id)
print(server)
if cluster.task_id > 0:
server.join()
# Otherwise we are the main task, let's define the devices
devices = [
"/job:mesh/task:%d/device:GPU:%d" % (i, j)
for i in range(cluster_spec.num_tasks("mesh"))
for j in range(FLAGS.gpus_per_task)
]
print("List of devices", devices)
mesh_impl = mtf.placement_mesh_impl.PlacementMeshImpl(
mesh_shape, layout_rules, devices)
##Begin here
klin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../flowpm/data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session(server.target) as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
tf.reset_default_graph()
print('ic constructed')
graph = mtf.Graph()
mesh = mtf.Mesh(graph, "my_mesh")
initial_conditions, final_field, loss, var_grads, update_op, linear_op, input_field, lr, R0 = recon_prototype(
mesh, fin, nc=FLAGS.nc, batch_size=FLAGS.batch_size, dtype=dtype)
# Lower mesh computation
start = time.time()
lowering = mtf.Lowering(graph, {mesh: mesh_impl})
restore_hook = mtf.MtfRestoreHook(lowering)
end = time.time()
print('\n Time for lowering : %f \n' % (end - start))
tf_initc = lowering.export_to_tf_tensor(initial_conditions)
tf_final = lowering.export_to_tf_tensor(final_field)
tf_grads = lowering.export_to_tf_tensor(var_grads[0])
tf_linear_op = lowering.lowered_operation(linear_op)
tf_update_ops = lowering.lowered_operation(update_op)
n_block_x, n_block_y, n_block_z = FLAGS.nx, FLAGS.ny, 1
nc = FLAGS.nc
ic_hrshape = ic.reshape([
FLAGS.batch_size, n_block_x, nc // n_block_x, n_block_y,
nc // n_block_y, n_block_z, nc // n_block_z
])
ic_hrshape = np.transpose(ic_hrshape, [0, 1, 3, 5, 2, 4, 6])
with tf.Session(server.target) as sess:
#ic_check, fin_check = sess.run([tf_initc, tf_final])
sess.run(tf_linear_op, feed_dict={input_field: ic_hrshape})
ic_check, fin_check = sess.run([tf_initc, tf_final])
dg.saveimfig('-check', [ic_check, fin_check], [ic, fin], fpath)
dg.save2ptfig('-check', [ic_check, fin_check], [ic, fin], fpath, bs)
sess.run(tf_linear_op,
feed_dict={
input_field:
np.random.normal(size=ic.size).reshape(ic_hrshape.shape)
})
ic0, fin0 = sess.run([tf_initc, tf_final])
dg.saveimfig('-init', [ic0, fin0], [ic, fin], fpath)
start = time.time()
niter = 5
iiter = 0
start0 = time.time()
RRs = [4, 2, 1, 0.5, 0]
lrs = np.array([0.2, 0.15, 0.1, 0.1, 0.1])
#lrs = [0.1, 0.05, 0.01, 0.005, 0.001]
for iR, zlR in enumerate(zip(RRs, lrs)):
RR, lR = zlR
#for ff in [fpath + '/figs-R%02d'%(10*RR)]:
for ff in [fpath + '/figsiter']:
try:
os.makedirs(ff)
except Exception as e:
print(e)
for i in range(301):
if (i % niter == 0):
end = time.time()
print('Iter : ', i)
print('Time taken for %d iterations: ' % niter,
end - start)
start = end
##
ic1, fin1 = sess.run([tf_initc, tf_final])
#dg.saveimfig(i, [ic1, fin1], [ic, fin], fpath+'/figs-R%02d'%(10*RR))
#dg.save2ptfig(i, [ic1, fin1], [ic, fin], fpath+'/figs-R%02d'%(10*RR), bs)
dg.saveimfig2x2(iiter, [ic1, fin1], [ic, fin],
fpath + '/figsiter')
#
sess.run(tf_update_ops, {lr: lR, R0: RR})
iiter += 1
dg.saveimfig(i * (iR + 1), [ic1, fin1], [ic, fin], fpath + '/figs')
dg.save2ptfig(i * (iR + 1), [ic1, fin1], [ic, fin],
fpath + '/figs', bs)
ic1, fin1 = sess.run([tf_initc, tf_final])
print('Total time taken for %d iterations is : ' % iiter,
time.time() - start0)
dg.saveimfig(i, [ic1, fin1], [ic, fin], fpath)
dg.save2ptfig(i, [ic1, fin1], [ic, fin], fpath, bs)
np.save(fpath + 'ic_recon', ic1)
np.save(fpath + 'final_recon', fin1)
print('Total wallclock time is : ', time.time() - start0)
##
exit(0)
def main(_):
dtype = tf.float32
mesh_shape = mtf.convert_to_shape(FLAGS.mesh_shape)
startw = time.time()
print(mesh_shape)
##
##
##Begin here
klin = np.loadtxt('../data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('..//data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
print(ic.shape, fin.shape)
########################################################
print(ic.shape, fin.shape)
recon_estimator = tf.estimator.Estimator(model_fn=model_fn,
model_dir=fpath)
def eval_input_fn():
features = {}
features['data'] = fin
features['R0'] = 0
features['x0'] = None
features['lr'] = 0
return features, None
# Train and evaluate model.
RRs = [4., 2., 1., 0.5, 0.]
niter = 200
iiter = 0
for R0 in RRs:
print('\nFor iteration %d and R=%0.1f\n' % (iiter, R0))
def train_input_fn():
features = {}
features['data'] = fin
features['R0'] = R0
features['x0'] = np.random.normal(size=fin.size).reshape(fin.shape)
features['lr'] = 0.01
return features, None
for _ in range(1):
recon_estimator.train(input_fn=train_input_fn,
max_steps=iiter + niter)
eval_results = recon_estimator.predict(input_fn=eval_input_fn,
yield_single_examples=False)
for i, pred in enumerate(eval_results):
if i > 0: break
iiter += niter #
dg.saveimfig(iiter, [pred['ic'], pred['data']], [ic, fin],
fpath + '/figs/')
dg.save2ptfig(iiter, [pred['ic'], pred['data']], [ic, fin],
fpath + '/figs/', bs)
sys.exit(0)
def main(_):
dtype = tf.float32
startw = time.time()
tf.random.set_random_seed(100)
np.random.seed(100)
# Compute a few things first, using simple tensorflow
a0 = FLAGS.a0
a = FLAGS.af
nsteps = FLAGS.nsteps
bs, nc = FLAGS.box_size, FLAGS.nc
klin = np.loadtxt('../data/Planck15_a1p00.txt').T[0]
plin = np.loadtxt('../data/Planck15_a1p00.txt').T[1]
ipklin = iuspline(klin, plin)
stages = np.linspace(a0, a, nsteps, endpoint=True)
tf.reset_default_graph()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(FLAGS.nc,
FLAGS.box_size,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
if FLAGS.nbody:
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
else:
final_state = lpt_init(tfic, a0=stages[-1], order=1)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
ic, fin = sess.run([tfic, tfinal_field])
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
k, pic = tools.power(ic[0] + 1, boxsize=bs)
k, pfin = tools.power(fin[0], boxsize=bs)
plt.plot(k, pic)
plt.plot(k, pfin)
plt.loglog()
plt.grid(which='both')
plt.savefig('pklin.png')
plt.close()
print(pic)
print(pfin)
#sys.exit(-1)
################################################################
tf.reset_default_graph()
print('ic constructed')
noise = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(
np.float32) * 1
data_noised = fin + noise
data = data_noised
startpos = noise.copy().flatten().astype(np.float32)
x0 = tf.placeholder(dtype=tf.float32,
shape=data.flatten().shape,
name='initlin')
Rsm = tf.placeholder(tf.float32, name='smoothing')
def recon_prototype(linearflat):
"""
"""
linear = tf.reshape(linearflat, data.shape)
#
#loss = tf.reduce_sum(tf.square(linear - minimum))
state = lpt_init(linear, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
final_field = cic_paint(tf.zeros_like(linear), final_state[0])
residual = final_field - data.astype(np.float32)
base = residual
Rsmsq = tf.multiply(Rsm * bs / nc, Rsm * bs / nc)
smwts = tf.exp(tf.multiply(-kmesh**2, Rsmsq))
basek = r2c3d(base, norm=nc**3)
basek = tf.multiply(basek, tf.cast(smwts, tf.complex64))
base = c2r3d(basek, norm=nc**3)
#
chisq = tf.multiply(base, base)
chisq = tf.reduce_sum(chisq)
chisq = tf.multiply(chisq, 1 / nc**3, name='chisq')
#Prior
lineark = r2c3d(linear, norm=nc**3)
priormesh = tf.square(tf.cast(tf.abs(lineark), tf.float32))
prior = tf.reduce_sum(tf.multiply(priormesh, 1 / priorwt))
prior = tf.multiply(prior, 1 / nc**3, name='prior')
#
loss = chisq + prior
grad = tf.gradients(loss, linearflat)
print(grad)
return loss, grad[0]
@tf.function
def min_lbfgs():
return tfp.optimizer.lbfgs_minimize(
#make_val_and_grad_fn(recon_prototype),
recon_prototype,
initial_position=x0,
tolerance=1e-10,
max_iterations=100)
with tf.Session() as sess:
start = time.time()
results = sess.run(min_lbfgs(), {Rsm: 2, x0: startpos})
print("\n")
print(results)
print("\n")
minimum = results.position
print(minimum)
print("\nTime taken : ", time.time() - start)
start = time.time()
results = sess.run(min_lbfgs(), {Rsm: 1, x0: minimum})
print("\n")
print(results)
minimum = results.position
print("\n")
print(minimum)
print("\nTime taken : ", time.time() - start)
start = time.time()
results = sess.run(min_lbfgs(), {Rsm: 0, x0: minimum})
print("\n")
print(results)
minimum = results.position
print("\n")
print(minimum)
print("\nTime taken : ", time.time() - start)
tf.reset_default_graph()
print("\n")
print('\nminimized\n')
tfic = linear_field(
FLAGS.nc, FLAGS.box_size, ipklin, batch_size=1, seed=100,
dtype=dtype) * 0 + minimum.reshape(data_noised.shape)
state = lpt_init(tfic, a0=0.1, order=1)
final_state = nbody(state, stages, FLAGS.nc)
tfinal_field = cic_paint(tf.zeros_like(tfic), final_state[0])
with tf.Session() as sess:
minic, minfin = sess.run([tfic, tfinal_field])
dg.saveimfig(0, [minic, minfin], [ic, fin], fpath + '')
dg.save2ptfig(0, [minic, minfin], [ic, fin], fpath + '', bs)
np.save(fpath + 'recon0ic', minic)
np.save(fpath + 'recon-final', minfin)
##
exit(0)
def main():
startw = time.time()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(nc,
bs,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
tfinal_field = pm(tfic)
ic, fin = tfic.numpy(), tfinal_field.numpy()
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
print('\ndata constructed\n')
noise = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(np.float32)
data_noised = fin + noise
data = data_noised
@tf.function
def recon_prototype(linear, Rsm):
"""
"""
linear = tf.reshape(linear, data.shape)
#loss = tf.reduce_sum(tf.square(linear - minimum))
final_field = pm(linear)
residual = final_field - data.astype(np.float32)
base = residual
if anneal:
print("\nAdd annealing section to graph\n")
Rsmsq = tf.multiply(Rsm * bs / nc, Rsm * bs / nc)
smwts = tf.exp(tf.multiply(-kmesh**2, Rsmsq))
basek = r2c3d(base, norm=nc**3)
basek = tf.multiply(basek, tf.cast(smwts, tf.complex64))
base = c2r3d(basek, norm=nc**3)
chisq = tf.multiply(base, base)
chisq = tf.reduce_sum(chisq)
chisq = tf.multiply(chisq, 1 / nc**3, name='chisq')
#Prior
lineark = r2c3d(linear, norm=nc**3)
priormesh = tf.square(tf.cast(tf.abs(lineark), tf.float32))
prior = tf.reduce_sum(tf.multiply(priormesh, 1 / priorwt))
prior = tf.multiply(prior, 1 / nc**3, name='prior')
#
loss = chisq + prior
return loss
@tf.function
def val_and_grad(x, Rsm):
print("val and grad : ", x.shape)
with tf.GradientTape() as tape:
tape.watch(x)
loss = recon_prototype(x, tf.constant(Rsm, dtype=tf.float32))
grad = tape.gradient(loss, x)
return loss, grad
@tf.function
def val_and_grad(x, Rsm):
print("val and grad : ", x.shape)
with tf.GradientTape() as tape:
tape.watch(x)
loss = recon_prototype(x, Rsm)
grad = tape.gradient(loss, x)
return loss, grad
@tf.function
def grad(x, Rsm):
with tf.GradientTape() as tape:
tape.watch(x)
loss = recon_prototype(x, Rsm)
grad = tape.gradient(loss, x)
return grad
#Function for LBFSG
def func(x, RR):
return [
vv.numpy().astype(np.float64)
for vv in val_and_grad(x=tf.constant(x, dtype=tf.float32),
Rsm=tf.constant(RR, dtype=tf.float32))
] #
# Create an optimizer for Adam.
opt = tf.keras.optimizers.Adam(learning_rate=lr)
#Loop it Reconstruction
##Reconstruction
x0 = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(np.float32)
linear = tf.Variable(name='linmesh',
shape=(1, nc, nc, nc),
dtype=tf.float32,
initial_value=x0,
trainable=True)
for iR, RR in enumerate(RRs):
if optimizer == 'lbfgs':
results = sopt.minimize(fun=func,
x0=x0,
args=RR,
jac=True,
method='L-BFGS-B',
tol=1e-10,
options={
'maxiter': niter,
'ftol': 1e-12,
'gtol': 1e-12,
'eps': 1e-12
})
#results = sopt.minimize(fun=func, x0=x0, args = RR, jac=True, method='L-BFGS-B',
# options={'maxiter':niter})
print(results)
minic = results.x.reshape(data.shape)
elif optimizer == 'adam':
for i in range(niter):
grads = grad([linear], tf.constant(RR, dtype=tf.float32))
opt.apply_gradients(zip(grads, [linear]))
minic = linear.numpy().reshape(data.shape)
#
print('\nminimized\n')
minfin = pm(tf.constant(minic, dtype=tf.float32)).numpy()
dg.saveimfig("-R%d" % RR, [minic, minfin], [ic, fin], fpath + '')
dg.save2ptfig("-R%d" % RR, [minic, minfin], [ic, fin], fpath + '', bs)
###
x0 = minic
np.save(fpath + 'ic-%d' % iR, minic)
np.save(fpath + 'final-%d' % iR, minfin)
exit(0)
def main():
startw = time.time()
# Run normal flowpm to generate data
try:
ic, fin = np.load(fpath + 'ic.npy'), np.load(fpath + 'final.npy')
print('Data loaded')
except Exception as e:
print('Exception occured', e)
tfic = linear_field(nc,
bs,
ipklin,
batch_size=1,
seed=100,
dtype=dtype)
tfinal_field = pm(tfic)
ic, fin = tfic.numpy(), tfinal_field.numpy()
np.save(fpath + 'ic', ic)
np.save(fpath + 'final', fin)
print('\ndata constructed\n')
noise = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(np.float32)
data_noised = fin + noise
data = data_noised
@tf.function
def recon_prototype(linear, Rsm=0):
"""
"""
linear = tf.reshape(linear, data.shape)
#loss = tf.reduce_sum(tf.square(linear - minimum))
final_field = pm(linear)
residual = final_field - data.astype(np.float32)
base = residual
if anneal:
print("\nAdd annealing section to graph\n")
Rsmsq = tf.multiply(Rsm * bs / nc, Rsm * bs / nc)
smwts = tf.exp(tf.multiply(-kmesh**2, Rsmsq))
basek = r2c3d(base, norm=nc**3)
basek = tf.multiply(basek, tf.cast(smwts, tf.complex64))
base = c2r3d(basek, norm=nc**3)
###
chisq = tf.multiply(base, base)
chisq = tf.reduce_sum(chisq)
chisq = tf.multiply(chisq, 1 / nc**3, name='chisq')
#Prior
lineark = r2c3d(linear, norm=nc**3)
priormesh = tf.square(tf.cast(tf.abs(lineark), tf.float32))
prior = tf.reduce_sum(tf.multiply(priormesh, 1 / priorwt))
prior = tf.multiply(prior, 1 / nc**3, name='prior')
#
loss = chisq + prior
return loss
#
@tf.function
def val_and_grad(x, RR):
with tf.GradientTape() as tape:
tape.watch(x)
loss = recon_prototype(x, RR)
grad = tape.gradient(loss, x)
return loss, grad
@tf.function
def min_lbfgs(x0, RR):
return tfp.optimizer.lbfgs_minimize(
lambda x: val_and_grad(x, tf.constant(RR, dtype=tf.float32)),
initial_position=x0,
tolerance=1e-10,
max_iterations=200)
#
# def make_val_and_grad_fn(value_fn, R):
# @functools.wraps(value_fn)
# def val_and_grad(x):
# return tfp.math.value_and_gradient(value_fn, x)
# return val_and_grad
#
# @tf.function
# def min_lbfgs(x0, RR):
# return tfp.optimizer.lbfgs_minimize(
# make_val_and_grad_fn(recon_prototype),
# recon_prototype,
# initial_position=x0,
# tolerance=1e-10,
# max_iterations=100)
#
##Reconstruction
x0 = np.random.normal(0, 1, nc**3).reshape(fin.shape).astype(
np.float32).flatten()
RRs = [2, 1, 0.5, 0]
for iR, RR in enumerate(RRs):
results = min_lbfgs(x0, RR)
#results = sopt.minimize(fun=func, x0=x0, args = RR, jac=True, method='L-BFGS-B',
# options={'maxiter':200, 'ftol': 2.220446049250313e-09, 'gtol': 1e-10,})
print(results)
###
minic = results.position.numpy().reshape(data.shape)
print(minic.shape)
print('\nminimized\n')
minfin = pm(tf.constant(minic, dtype=tf.float32)).numpy()
dg.saveimfig("-R%d" % RR, [minic, minfin], [ic, fin], fpath + '')
dg.save2ptfig("-R%d" % RR, [minic, minfin], [ic, fin], fpath + '', bs)
