def distributed_strategy(args):
kappa_gen = NISGenerator( # only used to generate pixelated kappa fields
kappa_fov=args.kappa_fov,
src_fov=args.source_fov,
pixels=args.kappa_pixels,
z_source=args.z_source,
z_lens=args.z_lens
)
min_theta_e = 0.1 * args.image_fov if args.min_theta_e is None else args.min_theta_e
max_theta_e = 0.45 * args.image_fov if args.max_theta_e is None else args.max_theta_e
cosmos_files = glob.glob(os.path.join(args.cosmos_dir, "*.tfrecords"))
cosmos = tf.data.TFRecordDataset(cosmos_files, compression_type=args.compression_type)
cosmos = cosmos.map(decode_image).map(preprocess_image)
if args.shuffle_cosmos:
cosmos = cosmos.shuffle(buffer_size=args.buffer_size, reshuffle_each_iteration=True)
cosmos = cosmos.batch(args.batch_size)
window = tukey(args.src_pixels, alpha=args.tukey_alpha)
window = np.outer(window, window)
phys = PhysicalModel(
image_fov=args.image_fov,
kappa_fov=args.kappa_fov,
src_fov=args.source_fov,
pixels=args.lens_pixels,
kappa_pixels=args.kappa_pixels,
src_pixels=args.src_pixels,
method="conv2d"
)
noise_a = (args.noise_rms_min - args.noise_rms_mean) / args.noise_rms_std
noise_b = (args.noise_rms_max - args.noise_rms_mean) / args.noise_rms_std
psf_a = (args.psf_fwhm_min - args.psf_fwhm_mean) / args.psf_fwhm_std
psf_b = (args.psf_fwhm_max - args.psf_fwhm_mean) / args.psf_fwhm_std
options = tf.io.TFRecordOptions(compression_type=args.compression_type)
with tf.io.TFRecordWriter(os.path.join(args.output_dir, f"data_{THIS_WORKER}.tfrecords"), options) as writer:
print(f"Started worker {THIS_WORKER} at {datetime.now().strftime('%y-%m-%d_%H-%M-%S')}")
for i in range((THIS_WORKER - 1) * args.batch_size, args.len_dataset, N_WORKERS * args.batch_size):
for galaxies in cosmos:
break
galaxies = window[np.newaxis, ..., np.newaxis] * galaxies
noise_rms = truncnorm.rvs(noise_a, noise_b, loc=args.noise_rms_mean, scale=args.noise_rms_std, size=args.batch_size)
fwhm = truncnorm.rvs(psf_a, psf_b, loc=args.psf_fwhm_mean, scale=args.psf_fwhm_std, size=args.batch_size)
psf = phys.psf_models(fwhm, cutout_size=args.psf_cutout_size)
batch_size = galaxies.shape[0]
_r = tf.random.uniform(shape=[batch_size, 1, 1], minval=0, maxval=args.max_shift)
_theta = tf.random.uniform(shape=[batch_size, 1, 1], minval=-np.pi, maxval=np.pi)
x0 = _r * tf.math.cos(_theta)
y0 = _r * tf.math.sin(_theta)
ellipticity = tf.random.uniform(shape=[batch_size, 1, 1], minval=0., maxval=args.max_ellipticity)
phi = tf.random.uniform(shape=[batch_size, 1, 1], minval=-np.pi, maxval=np.pi)
einstein_radius = tf.random.uniform(shape=[batch_size, 1, 1], minval=min_theta_e, maxval=max_theta_e)
kappa = kappa_gen.kappa_field(x0, y0, ellipticity, phi, einstein_radius)
lensed_images = phys.noisy_forward(galaxies, kappa, noise_rms=noise_rms, psf=psf)
records = encode_examples(
kappa=kappa,
galaxies=galaxies,
lensed_images=lensed_images,
z_source=args.z_source,
z_lens=args.z_lens,
image_fov=phys.image_fov,
kappa_fov=phys.kappa_fov,
source_fov=args.source_fov,
noise_rms=noise_rms,
psf=psf,
fwhm=fwhm
)
for record in records:
writer.write(record)
print(f"Finished work at {datetime.now().strftime('%y-%m-%d_%H-%M-%S')}")
def test_noisy_forward_conv2():
phys = PhysicalModel(pixels=64, src_pixels=64)
source = tf.random.normal([2, 64, 64, 1])
kappa = tf.math.exp(tf.random.uniform([2, 64, 64, 1]))
noise_rms = 0.1
phys.noisy_forward(source, kappa, noise_rms)
def distributed_strategy(args):
psf_pixels = 20
pixels = 128
model = os.path.join(os.getenv('CENSAI_PATH'), "models", args.model)
ps_observation = PowerSpectrum(bins=args.observation_coherence_bins,
pixels=pixels)
ps_source = PowerSpectrum(bins=args.source_coherence_bins, pixels=pixels)
ps_kappa = PowerSpectrum(bins=args.kappa_coherence_bins, pixels=pixels)
phys = PhysicalModel(
pixels=pixels,
kappa_pixels=pixels,
src_pixels=pixels,
image_fov=7.68,
kappa_fov=7.68,
src_fov=3.,
method="fft",
)
with open(os.path.join(model, "unet_hparams.json")) as f:
unet_params = json.load(f)
unet_params["kernel_l2_amp"] = args.l2_amp
unet = Model(**unet_params)
ckpt = tf.train.Checkpoint(net=unet)
checkpoint_manager = tf.train.CheckpointManager(ckpt, model, 1)
checkpoint_manager.checkpoint.restore(
checkpoint_manager.latest_checkpoint).expect_partial()
with open(os.path.join(model, "rim_hparams.json")) as f:
rim_params = json.load(f)
rim_params["source_link"] = "relu"
rim = RIM(phys, unet, **rim_params)
kvae_path = os.path.join(os.getenv('CENSAI_PATH'), "models",
args.kappa_vae)
with open(os.path.join(kvae_path, "model_hparams.json"), "r") as f:
kappa_vae_hparams = json.load(f)
kappa_vae = VAE(**kappa_vae_hparams)
ckpt1 = tf.train.Checkpoint(step=tf.Variable(1), net=kappa_vae)
checkpoint_manager1 = tf.train.CheckpointManager(ckpt1, kvae_path, 1)
checkpoint_manager1.checkpoint.restore(
checkpoint_manager1.latest_checkpoint).expect_partial()
svae_path = os.path.join(os.getenv('CENSAI_PATH'), "models",
args.source_vae)
with open(os.path.join(svae_path, "model_hparams.json"), "r") as f:
source_vae_hparams = json.load(f)
source_vae = VAE(**source_vae_hparams)
ckpt2 = tf.train.Checkpoint(step=tf.Variable(1), net=source_vae)
checkpoint_manager2 = tf.train.CheckpointManager(ckpt2, svae_path, 1)
checkpoint_manager2.checkpoint.restore(
checkpoint_manager2.latest_checkpoint).expect_partial()
model_name = os.path.split(model)[-1]
wk = tf.keras.layers.Lambda(lambda k: tf.sqrt(k) / tf.reduce_sum(
tf.sqrt(k), axis=(1, 2, 3), keepdims=True))
with h5py.File(
os.path.join(
os.getenv("CENSAI_PATH"), "results", args.experiment_name +
"_" + model_name + f"_{THIS_WORKER:02d}.h5"), 'w') as hf:
data_len = args.size // N_WORKERS
hf.create_dataset(name="observation",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
hf.create_dataset(name="psf",
shape=[data_len, psf_pixels, psf_pixels, 1],
dtype=np.float32)
hf.create_dataset(name="psf_fwhm", shape=[data_len], dtype=np.float32)
hf.create_dataset(name="noise_rms", shape=[data_len], dtype=np.float32)
hf.create_dataset(
name="source",
shape=[data_len, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
hf.create_dataset(
name="kappa",
shape=[data_len, phys.kappa_pixels, phys.kappa_pixels, 1],
dtype=np.float32)
hf.create_dataset(name="observation_pred",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
hf.create_dataset(name="observation_pred_reoptimized",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
hf.create_dataset(
name="source_pred",
shape=[data_len, rim.steps, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
hf.create_dataset(
name="source_pred_reoptimized",
shape=[data_len, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
hf.create_dataset(name="kappa_pred",
shape=[
data_len, rim.steps, phys.kappa_pixels,
phys.kappa_pixels, 1
],
dtype=np.float32)
hf.create_dataset(
name="kappa_pred_reoptimized",
shape=[data_len, phys.kappa_pixels, phys.kappa_pixels, 1],
dtype=np.float32)
hf.create_dataset(name="chi_squared",
shape=[data_len, rim.steps],
dtype=np.float32)
hf.create_dataset(name="chi_squared_reoptimized",
shape=[data_len, rim.steps],
dtype=np.float32)
hf.create_dataset(name="chi_squared_reoptimized_series",
shape=[data_len, rim.steps, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="sampled_chi_squared_reoptimized_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="source_optim_mse",
shape=[data_len],
dtype=np.float32)
hf.create_dataset(name="source_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="sampled_source_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="kappa_optim_mse",
shape=[data_len],
dtype=np.float32)
hf.create_dataset(name="kappa_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="sampled_kappa_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
hf.create_dataset(name="latent_kappa_gt_distance_init",
shape=[data_len, kappa_vae.latent_size],
dtype=np.float32)
hf.create_dataset(name="latent_source_gt_distance_init",
shape=[data_len, source_vae.latent_size],
dtype=np.float32)
hf.create_dataset(name="latent_kappa_gt_distance_end",
shape=[data_len, kappa_vae.latent_size],
dtype=np.float32)
hf.create_dataset(name="latent_source_gt_distance_end",
shape=[data_len, source_vae.latent_size],
dtype=np.float32)
hf.create_dataset(name="source_coherence_spectrum",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="source_coherence_spectrum_reoptimized",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="observation_coherence_spectrum",
shape=[data_len, args.observation_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="observation_coherence_spectrum_reoptimized",
shape=[data_len, args.observation_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="kappa_coherence_spectrum",
shape=[data_len, args.kappa_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="kappa_coherence_spectrum_reoptimized",
shape=[data_len, args.kappa_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="observation_frequencies",
shape=[args.observation_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="source_frequencies",
shape=[args.source_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="kappa_frequencies",
shape=[args.kappa_coherence_bins],
dtype=np.float32)
hf.create_dataset(name="kappa_fov", shape=[1], dtype=np.float32)
hf.create_dataset(name="source_fov", shape=[1], dtype=np.float32)
hf.create_dataset(name="observation_fov", shape=[1], dtype=np.float32)
for i in range(data_len):
checkpoint_manager.checkpoint.restore(
checkpoint_manager.latest_checkpoint).expect_partial(
) # reset model weights
# Produce an observation
kappa = 10**kappa_vae.sample(1)
source = tf.nn.relu(source_vae.sample(1))
source /= tf.reduce_max(source, axis=(1, 2, 3), keepdims=True)
noise_rms = 10**tf.random.uniform(shape=[1],
minval=-2.5,
maxval=-1)
fwhm = tf.random.uniform(shape=[1], minval=0.06, maxval=0.3)
psf = phys.psf_models(fwhm, cutout_size=psf_pixels)
observation = phys.noisy_forward(source, kappa, noise_rms, psf)
# RIM predictions for kappa and source
source_pred, kappa_pred, chi_squared = rim.predict(
observation, noise_rms, psf)
observation_pred = phys.forward(source_pred[-1], kappa_pred[-1],
psf)
source_o = source_pred[-1]
kappa_o = kappa_pred[-1]
# Latent code of model predictions
z_source, _ = source_vae.encoder(source_o)
z_kappa, _ = kappa_vae.encoder(log_10(kappa_o))
# Ground truth latent code for oracle metrics
z_source_gt, _ = source_vae.encoder(source)
z_kappa_gt, _ = kappa_vae.encoder(log_10(kappa))
# Re-optimize weights of the model
STEPS = args.re_optimize_steps
learning_rate_schedule = tf.keras.optimizers.schedules.ExponentialDecay(
initial_learning_rate=args.learning_rate,
decay_rate=args.decay_rate,
decay_steps=args.decay_steps,
staircase=args.staircase)
optim = tf.keras.optimizers.RMSprop(
learning_rate=learning_rate_schedule)
chi_squared_series = tf.TensorArray(DTYPE, size=STEPS)
source_mse = tf.TensorArray(DTYPE, size=STEPS)
kappa_mse = tf.TensorArray(DTYPE, size=STEPS)
sampled_chi_squared_series = tf.TensorArray(DTYPE, size=STEPS)
sampled_source_mse = tf.TensorArray(DTYPE, size=STEPS)
sampled_kappa_mse = tf.TensorArray(DTYPE, size=STEPS)
best = chi_squared
source_best = source_pred[-1]
kappa_best = kappa_pred[-1]
source_mse_best = tf.reduce_mean((source_best - source)**2)
kappa_mse_best = tf.reduce_mean((kappa_best - log_10(kappa))**2)
# ===================== Optimization ==============================
for current_step in tqdm(range(STEPS)):
# ===================== VAE SAMPLING ==============================
# L1 distance with ground truth in latent space -- this is changed by an user defined value when using real data
# z_source_std = tf.abs(z_source - z_source_gt)
# z_kappa_std = tf.abs(z_kappa - z_kappa_gt)
z_source_std = args.source_vae_ball_size
z_kappa_std = args.kappa_vae_ball_size
# Sample latent code, then decode and forward
z_s = tf.random.normal(
shape=[args.sample_size, source_vae.latent_size],
mean=z_source,
stddev=z_source_std)
z_k = tf.random.normal(
shape=[args.sample_size, kappa_vae.latent_size],
mean=z_kappa,
stddev=z_kappa_std)
sampled_source = tf.nn.relu(source_vae.decode(z_s))
sampled_source /= tf.reduce_max(sampled_source,
axis=(1, 2, 3),
keepdims=True)
sampled_kappa = kappa_vae.decode(z_k) # output in log_10 space
sampled_observation = phys.noisy_forward(
sampled_source, 10**sampled_kappa, noise_rms,
tf.tile(psf, [args.sample_size, 1, 1, 1]))
with tf.GradientTape() as tape:
tape.watch(unet.trainable_variables)
s, k, chi_sq = rim.call(
sampled_observation,
noise_rms,
tf.tile(psf, [args.sample_size, 1, 1, 1]),
outer_tape=tape)
_kappa_mse = tf.reduce_sum(wk(10**sampled_kappa) *
(k - sampled_kappa)**2,
axis=(2, 3, 4))
cost = tf.reduce_mean(_kappa_mse)
cost += tf.reduce_mean((s - sampled_source)**2)
cost += tf.reduce_sum(rim.unet.losses) # weight decay
grads = tape.gradient(cost, unet.trainable_variables)
optim.apply_gradients(zip(grads, unet.trainable_variables))
# Record performance on sampled dataset
sampled_chi_squared_series = sampled_chi_squared_series.write(
index=current_step,
value=tf.squeeze(tf.reduce_mean(chi_sq[-1])))
sampled_source_mse = sampled_source_mse.write(
index=current_step,
value=tf.reduce_mean((s[-1] - sampled_source)**2))
sampled_kappa_mse = sampled_kappa_mse.write(
index=current_step,
value=tf.reduce_mean((k[-1] - sampled_kappa)**2))
# Record model prediction on data
s, k, chi_sq = rim.call(observation, noise_rms, psf)
chi_squared_series = chi_squared_series.write(
index=current_step, value=tf.squeeze(chi_sq))
source_o = s[-1]
kappa_o = k[-1]
# oracle metrics, remove when using real data
source_mse = source_mse.write(index=current_step,
value=tf.reduce_mean(
(source_o - source)**2))
kappa_mse = kappa_mse.write(index=current_step,
value=tf.reduce_mean(
(kappa_o - log_10(kappa))**2))
if abs(chi_sq[-1, 0] - 1) < abs(best[-1, 0] - 1):
source_best = tf.nn.relu(source_o)
kappa_best = 10**kappa_o
best = chi_sq
source_mse_best = tf.reduce_mean((source_best - source)**2)
kappa_mse_best = tf.reduce_mean(
(kappa_best - log_10(kappa))**2)
source_o = source_best
kappa_o = kappa_best
y_pred = phys.forward(source_o, kappa_o, psf)
chi_sq_series = tf.transpose(chi_squared_series.stack())
source_mse = source_mse.stack()
kappa_mse = kappa_mse.stack()
sampled_chi_squared_series = sampled_chi_squared_series.stack()
sampled_source_mse = sampled_source_mse.stack()
sampled_kappa_mse = sampled_kappa_mse.stack()
# Latent code of optimized model predictions
z_source_opt, _ = source_vae.encoder(tf.nn.relu(source_o))
z_kappa_opt, _ = kappa_vae.encoder(log_10(kappa_o))
# Compute Power spectrum of converged predictions
_ps_observation = ps_observation.cross_correlation_coefficient(
observation[..., 0], observation_pred[..., 0])
_ps_observation2 = ps_observation.cross_correlation_coefficient(
observation[..., 0], y_pred[..., 0])
_ps_kappa = ps_kappa.cross_correlation_coefficient(
log_10(kappa)[..., 0],
log_10(kappa_pred[-1])[..., 0])
_ps_kappa2 = ps_kappa.cross_correlation_coefficient(
log_10(kappa)[..., 0], log_10(kappa_o[..., 0]))
_ps_source = ps_source.cross_correlation_coefficient(
source[..., 0], source_pred[-1][..., 0])
_ps_source2 = ps_source.cross_correlation_coefficient(
source[..., 0], source_o[..., 0])
# save results
hf["observation"][i] = observation.numpy().astype(np.float32)
hf["psf"][i] = psf.numpy().astype(np.float32)
hf["psf_fwhm"][i] = fwhm.numpy().astype(np.float32)
hf["noise_rms"][i] = noise_rms.numpy().astype(np.float32)
hf["source"][i] = source.numpy().astype(np.float32)
hf["kappa"][i] = kappa.numpy().astype(np.float32)
hf["observation_pred"][i] = observation_pred.numpy().astype(
np.float32)
hf["observation_pred_reoptimized"][i] = y_pred.numpy().astype(
np.float32)
hf["source_pred"][i] = tf.transpose(
source_pred, perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
hf["source_pred_reoptimized"][i] = source_o.numpy().astype(
np.float32)
hf["kappa_pred"][i] = tf.transpose(
kappa_pred, perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
hf["kappa_pred_reoptimized"][i] = kappa_o.numpy().astype(
np.float32)
hf["chi_squared"][i] = tf.squeeze(chi_squared).numpy().astype(
np.float32)
hf["chi_squared_reoptimized"][i] = tf.squeeze(best).numpy().astype(
np.float32)
hf["chi_squared_reoptimized_series"][i] = chi_sq_series.numpy(
).astype(np.float32)
hf["sampled_chi_squared_reoptimized_series"][
i] = 2 * sampled_chi_squared_series.numpy().astype(np.float32)
hf["source_optim_mse"][i] = source_mse_best.numpy().astype(
np.float32)
hf["source_optim_mse_series"][i] = source_mse.numpy().astype(
np.float32)
hf["sampled_source_optim_mse_series"][
i] = sampled_source_mse.numpy().astype(np.float32)
hf["kappa_optim_mse"][i] = kappa_mse_best.numpy().astype(
np.float32)
hf["kappa_optim_mse_series"][i] = kappa_mse.numpy().astype(
np.float32)
hf["sampled_kappa_optim_mse_series"][i] = sampled_kappa_mse.numpy(
).astype(np.float32)
hf["latent_source_gt_distance_init"][i] = tf.abs(
z_source - z_source_gt).numpy().squeeze().astype(np.float32)
hf["latent_kappa_gt_distance_init"][i] = tf.abs(
z_kappa - z_kappa_gt).numpy().squeeze().astype(np.float32)
hf["latent_source_gt_distance_end"][i] = tf.abs(
z_source_opt - z_source_gt).numpy().squeeze().astype(
np.float32)
hf["latent_kappa_gt_distance_end"][i] = tf.abs(
z_kappa_opt - z_kappa_gt).numpy().squeeze().astype(np.float32)
hf["observation_coherence_spectrum"][i] = _ps_observation
hf["observation_coherence_spectrum_reoptimized"][
i] = _ps_observation2
hf["source_coherence_spectrum"][i] = _ps_source
hf["source_coherence_spectrum_reoptimized"][i] = _ps_source2
hf["kappa_coherence_spectrum"][i] = _ps_kappa
hf["kappa_coherence_spectrum_reoptimized"][i] = _ps_kappa2
if i == 0:
_, f = np.histogram(np.fft.fftfreq(phys.pixels)[:phys.pixels //
2],
bins=ps_observation.bins)
f = (f[:-1] + f[1:]) / 2
hf["observation_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.src_pixels)[:phys.src_pixels // 2],
bins=ps_source.bins)
f = (f[:-1] + f[1:]) / 2
hf["source_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.kappa_pixels)[:phys.kappa_pixels // 2],
bins=ps_kappa.bins)
f = (f[:-1] + f[1:]) / 2
hf["kappa_frequencies"][:] = f
hf["kappa_fov"][0] = phys.kappa_fov
hf["source_fov"][0] = phys.src_fov
def distributed_strategy(args):
tf.random.set_seed(args.seed)
np.random.seed(args.seed)
model = os.path.join(os.getenv('CENSAI_PATH'), "models", args.model)
files = glob.glob(
os.path.join(os.getenv('CENSAI_PATH'), "data", args.train_dataset,
"*.tfrecords"))
files = tf.data.Dataset.from_tensor_slices(files)
train_dataset = files.interleave(lambda x: tf.data.TFRecordDataset(
x, compression_type=args.compression_type).shuffle(len(files)),
block_length=1,
num_parallel_calls=tf.data.AUTOTUNE)
# Read off global parameters from first example in dataset
for physical_params in train_dataset.map(decode_physical_model_info):
break
train_dataset = train_dataset.map(decode_results).shuffle(
buffer_size=args.buffer_size)
files = glob.glob(
os.path.join(os.getenv('CENSAI_PATH'), "data", args.val_dataset,
"*.tfrecords"))
files = tf.data.Dataset.from_tensor_slices(files)
val_dataset = files.interleave(lambda x: tf.data.TFRecordDataset(
x, compression_type=args.compression_type).shuffle(len(files)),
block_length=1,
num_parallel_calls=tf.data.AUTOTUNE)
val_dataset = val_dataset.map(decode_results).shuffle(
buffer_size=args.buffer_size)
files = glob.glob(
os.path.join(os.getenv('CENSAI_PATH'), "data", args.test_dataset,
"*.tfrecords"))
files = tf.data.Dataset.from_tensor_slices(files)
test_dataset = files.interleave(lambda x: tf.data.TFRecordDataset(
x, compression_type=args.compression_type).shuffle(len(files)),
block_length=1,
num_parallel_calls=tf.data.AUTOTUNE)
test_dataset = test_dataset.map(decode_results).shuffle(
buffer_size=args.buffer_size)
ps_lens = PowerSpectrum(bins=args.lens_coherence_bins,
pixels=physical_params["pixels"].numpy())
ps_source = PowerSpectrum(bins=args.source_coherence_bins,
pixels=physical_params["src pixels"].numpy())
ps_kappa = PowerSpectrum(bins=args.kappa_coherence_bins,
pixels=physical_params["kappa pixels"].numpy())
phys = PhysicalModel(
pixels=physical_params["pixels"].numpy(),
kappa_pixels=physical_params["kappa pixels"].numpy(),
src_pixels=physical_params["src pixels"].numpy(),
image_fov=physical_params["image fov"].numpy(),
kappa_fov=physical_params["kappa fov"].numpy(),
src_fov=physical_params["source fov"].numpy(),
method="fft",
)
phys_sie = AnalyticalPhysicalModel(
pixels=physical_params["pixels"].numpy(),
image_fov=physical_params["image fov"].numpy(),
src_fov=physical_params["source fov"].numpy())
with open(os.path.join(model, "unet_hparams.json")) as f:
unet_params = json.load(f)
unet_params["kernel_l2_amp"] = args.l2_amp
unet = Model(**unet_params)
ckpt = tf.train.Checkpoint(net=unet)
checkpoint_manager = tf.train.CheckpointManager(ckpt, model, 1)
checkpoint_manager.checkpoint.restore(
checkpoint_manager.latest_checkpoint).expect_partial()
with open(os.path.join(model, "rim_hparams.json")) as f:
rim_params = json.load(f)
rim = RIM(phys, unet, **rim_params)
dataset_names = [args.train_dataset, args.val_dataset, args.test_dataset]
dataset_shapes = [args.train_size, args.val_size, args.test_size]
model_name = os.path.split(model)[-1]
# from censai.utils import nulltape
# def call_with_mask(self, lensed_image, noise_rms, psf, mask, outer_tape=nulltape):
# """
# Used in training. Return linked kappa and source maps.
# """
# batch_size = lensed_image.shape[0]
# source, kappa, source_grad, kappa_grad, states = self.initial_states(batch_size) # initiate all tensors to 0
# source, kappa, states = self.time_step(lensed_image, source, kappa, source_grad, kappa_grad,
# states) # Use lens to make an initial guess with Unet
# source_series = tf.TensorArray(DTYPE, size=self.steps)
# kappa_series = tf.TensorArray(DTYPE, size=self.steps)
# chi_squared_series = tf.TensorArray(DTYPE, size=self.steps)
# # record initial guess
# source_series = source_series.write(index=0, value=source)
# kappa_series = kappa_series.write(index=0, value=kappa)
# # Main optimization loop
# for current_step in tf.range(self.steps - 1):
# with outer_tape.stop_recording():
# with tf.GradientTape() as g:
# g.watch(source)
# g.watch(kappa)
# y_pred = self.physical_model.forward(self.source_link(source), self.kappa_link(kappa), psf)
# flux_term = tf.square(
# tf.reduce_sum(y_pred, axis=(1, 2, 3)) - tf.reduce_sum(lensed_image, axis=(1, 2, 3)))
# log_likelihood = 0.5 * tf.reduce_sum(
# tf.square(y_pred - mask * lensed_image) / noise_rms[:, None, None, None] ** 2, axis=(1, 2, 3))
# cost = tf.reduce_mean(log_likelihood + self.flux_lagrange_multiplier * flux_term)
# source_grad, kappa_grad = g.gradient(cost, [source, kappa])
# source_grad, kappa_grad = self.grad_update(source_grad, kappa_grad, current_step)
# source, kappa, states = self.time_step(lensed_image, source, kappa, source_grad, kappa_grad, states)
# source_series = source_series.write(index=current_step + 1, value=source)
# kappa_series = kappa_series.write(index=current_step + 1, value=kappa)
# chi_squared_series = chi_squared_series.write(index=current_step,
# value=log_likelihood / self.pixels ** 2) # renormalize chi squared here
# # last step score
# log_likelihood = self.physical_model.log_likelihood(y_true=lensed_image, source=self.source_link(source),
# kappa=self.kappa_link(kappa), psf=psf, noise_rms=noise_rms)
# chi_squared_series = chi_squared_series.write(index=self.steps - 1, value=log_likelihood)
# return source_series.stack(), kappa_series.stack(), chi_squared_series.stack()
with h5py.File(
os.path.join(
os.getenv("CENSAI_PATH"), "results", args.experiment_name +
"_" + model_name + f"_{THIS_WORKER:02d}.h5"), 'w') as hf:
for i, dataset in enumerate([train_dataset, val_dataset,
test_dataset]):
g = hf.create_group(f'{dataset_names[i]}')
data_len = dataset_shapes[i] // N_WORKERS
g.create_dataset(name="lens",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(name="psf",
shape=[
data_len, physical_params['psf pixels'],
physical_params['psf pixels'], 1
],
dtype=np.float32)
g.create_dataset(name="psf_fwhm",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="noise_rms",
shape=[data_len],
dtype=np.float32)
g.create_dataset(
name="source",
shape=[data_len, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
g.create_dataset(
name="kappa",
shape=[data_len, phys.kappa_pixels, phys.kappa_pixels, 1],
dtype=np.float32)
g.create_dataset(name="lens_pred",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(name="lens_pred_reoptimized",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(name="source_pred",
shape=[
data_len, rim.steps, phys.src_pixels,
phys.src_pixels, 1
],
dtype=np.float32)
g.create_dataset(
name="source_pred_reoptimized",
shape=[data_len, phys.src_pixels, phys.src_pixels, 1])
g.create_dataset(name="kappa_pred",
shape=[
data_len, rim.steps, phys.kappa_pixels,
phys.kappa_pixels, 1
],
dtype=np.float32)
g.create_dataset(
name="kappa_pred_reoptimized",
shape=[data_len, phys.kappa_pixels, phys.kappa_pixels, 1],
dtype=np.float32)
g.create_dataset(name="chi_squared",
shape=[data_len, rim.steps],
dtype=np.float32)
g.create_dataset(name="chi_squared_reoptimized",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="chi_squared_reoptimized_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
g.create_dataset(name="source_optim_mse",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="source_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
g.create_dataset(name="kappa_optim_mse",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="kappa_optim_mse_series",
shape=[data_len, args.re_optimize_steps],
dtype=np.float32)
g.create_dataset(name="lens_coherence_spectrum",
shape=[data_len, args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_coherence_spectrum",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="lens_coherence_spectrum2",
shape=[data_len, args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="lens_coherence_spectrum_reoptimized",
shape=[data_len, args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_coherence_spectrum2",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_coherence_spectrum_reoptimized",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_coherence_spectrum",
shape=[data_len, args.kappa_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_coherence_spectrum_reoptimized",
shape=[data_len, args.kappa_coherence_bins],
dtype=np.float32)
g.create_dataset(name="lens_frequencies",
shape=[args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_frequencies",
shape=[args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_frequencies",
shape=[args.kappa_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_fov", shape=[1], dtype=np.float32)
g.create_dataset(name="source_fov", shape=[1], dtype=np.float32)
g.create_dataset(name="lens_fov", shape=[1], dtype=np.float32)
dataset = dataset.skip(data_len * (THIS_WORKER - 1)).take(data_len)
for batch, (lens, source, kappa, noise_rms, psf,
fwhm) in enumerate(
dataset.batch(1).prefetch(
tf.data.experimental.AUTOTUNE)):
checkpoint_manager.checkpoint.restore(
checkpoint_manager.latest_checkpoint).expect_partial(
) # reset model weights
# Compute predictions for kappa and source
source_pred, kappa_pred, chi_squared = rim.predict(
lens, noise_rms, psf)
lens_pred = phys.forward(source_pred[-1], kappa_pred[-1], psf)
# Re-optimize weights of the model
STEPS = args.re_optimize_steps
learning_rate_schedule = tf.keras.optimizers.schedules.ExponentialDecay(
initial_learning_rate=args.learning_rate,
decay_rate=args.decay_rate,
decay_steps=args.decay_steps,
staircase=args.staircase)
optim = tf.keras.optimizers.RMSprop(
learning_rate=learning_rate_schedule)
chi_squared_series = tf.TensorArray(DTYPE, size=STEPS)
source_mse = tf.TensorArray(DTYPE, size=STEPS)
kappa_mse = tf.TensorArray(DTYPE, size=STEPS)
best = chi_squared[-1, 0]
# best = abs(2*chi_squared[-1, 0] - 1)
# best_chisq = 2*chi_squared[-1, 0]
source_best = source_pred[-1]
kappa_best = kappa_pred[-1]
# source_mean = source_pred[-1]
# kappa_mean = rim.kappa_link(kappa_pred[-1])
# source_std = tf.zeros_like(source_mean)
# kappa_std = tf.zeros_like(kappa_mean)
# counter = 0
for current_step in tqdm(range(STEPS)):
with tf.GradientTape() as tape:
tape.watch(unet.trainable_variables)
# s, k, chi_sq = call_with_mask(rim, lens, noise_rms, psf, mask, tape)
s, k, chi_sq = rim.call(lens,
noise_rms,
psf,
outer_tape=tape)
cost = tf.reduce_mean(chi_sq) # mean over time steps
cost += tf.reduce_sum(rim.unet.losses)
log_likelihood = chi_sq[-1]
chi_squared_series = chi_squared_series.write(
index=current_step, value=log_likelihood)
source_o = s[-1]
kappa_o = k[-1]
source_mse = source_mse.write(
index=current_step,
value=tf.reduce_mean(
(source_o - rim.source_inverse_link(source))**2))
kappa_mse = kappa_mse.write(
index=current_step,
value=tf.reduce_mean(
(kappa_o - rim.kappa_inverse_link(kappa))**2))
if chi_sq[-1, 0] < args.converged_chisq:
source_best = rim.source_link(source_o)
kappa_best = rim.kappa_link(kappa_o)
best = chi_sq[-1, 0]
break
if chi_sq[-1, 0] < best:
source_best = rim.source_link(source_o)
kappa_best = rim.kappa_link(kappa_o)
best = chi_sq[-1, 0]
source_mse_best = tf.reduce_mean(
(source_best - rim.source_inverse_link(source))**2)
kappa_mse_best = tf.reduce_mean(
(kappa_best - rim.kappa_inverse_link(kappa))**2)
# if counter > 0:
# # Welford's online algorithm
# # source
# delta = source_o - source_mean
# source_mean = (counter * source_mean + (counter + 1) * source_o)/(counter + 1)
# delta2 = source_o - source_mean
# source_std += delta * delta2
# # kappa
# delta = rim.kappa_link(kappa_o) - kappa_mean
# kappa_mean = (counter * kappa_mean + (counter + 1) * rim.kappa_link(kappa_o)) / (counter + 1)
# delta2 = rim.kappa_link(kappa_o) - kappa_mean
# kappa_std += delta * delta2
# if best_chisq < args.converged_chisq:
# counter += 1
# if counter == args.window:
# break
# if 2*chi_sq[-1, 0] < best_chisq:
# best_chisq = 2*chi_sq[-1, 0]
# if abs(2*chi_sq[-1, 0] - 1) < best:
# source_best = rim.source_link(source_o)
# kappa_best = rim.kappa_link(kappa_o)
# best = abs(2 * chi_squared[-1, 0] - 1)
# source_mse_best = tf.reduce_mean((source_best - rim.source_inverse_link(source)) ** 2)
# kappa_mse_best = tf.reduce_mean((kappa_best - rim.kappa_inverse_link(kappa)) ** 2)
grads = tape.gradient(cost, unet.trainable_variables)
optim.apply_gradients(zip(grads, unet.trainable_variables))
source_o = source_best
kappa_o = kappa_best
y_pred = phys.forward(source_o, kappa_o, psf)
chi_sq_series = tf.transpose(chi_squared_series.stack(),
perm=[1, 0])
source_mse = source_mse.stack()[None, ...]
kappa_mse = kappa_mse.stack()[None, ...]
# kappa_std /= float(args.window)
# source_std /= float(args.window)
# Compute Power spectrum of converged predictions
_ps_lens = ps_lens.cross_correlation_coefficient(
lens[..., 0], lens_pred[..., 0])
_ps_lens3 = ps_lens.cross_correlation_coefficient(
lens[..., 0], y_pred[..., 0])
_ps_kappa = ps_kappa.cross_correlation_coefficient(
log_10(kappa)[..., 0],
log_10(kappa_pred[-1])[..., 0])
_ps_kappa2 = ps_kappa.cross_correlation_coefficient(
log_10(kappa)[..., 0], log_10(kappa_o[..., 0]))
_ps_source = ps_source.cross_correlation_coefficient(
source[..., 0], source_pred[-1][..., 0])
_ps_source3 = ps_source.cross_correlation_coefficient(
source[..., 0], source_o[..., 0])
# save results
g["lens"][batch] = lens.numpy().astype(np.float32)
g["psf"][batch] = psf.numpy().astype(np.float32)
g["psf_fwhm"][batch] = fwhm.numpy().astype(np.float32)
g["noise_rms"][batch] = noise_rms.numpy().astype(np.float32)
g["source"][batch] = source.numpy().astype(np.float32)
g["kappa"][batch] = kappa.numpy().astype(np.float32)
g["lens_pred"][batch] = lens_pred.numpy().astype(np.float32)
g["lens_pred_reoptimized"][batch] = y_pred.numpy().astype(
np.float32)
g["source_pred"][batch] = tf.transpose(
source_pred,
perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
g["source_pred_reoptimized"][batch] = source_o.numpy().astype(
np.float32)
g["kappa_pred"][batch] = tf.transpose(
kappa_pred,
perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
g["kappa_pred_reoptimized"][batch] = kappa_o.numpy().astype(
np.float32)
g["chi_squared"][batch] = tf.transpose(
chi_squared).numpy().astype(np.float32)
g["chi_squared_reoptimized"][batch] = best.numpy().astype(
np.float32)
g["chi_squared_reoptimized_series"][
batch] = chi_sq_series.numpy().astype(np.float32)
g["source_optim_mse"][batch] = source_mse_best.numpy().astype(
np.float32)
g["source_optim_mse_series"][batch] = source_mse.numpy(
).astype(np.float32)
g["kappa_optim_mse"][batch] = kappa_mse_best.numpy().astype(
np.float32)
g["kappa_optim_mse_series"][batch] = kappa_mse.numpy().astype(
np.float32)
g["lens_coherence_spectrum"][batch] = _ps_lens
g["lens_coherence_spectrum_reoptimized"][batch] = _ps_lens3
g["source_coherence_spectrum"][batch] = _ps_source
g["source_coherence_spectrum_reoptimized"][batch] = _ps_source3
g["lens_coherence_spectrum"][batch] = _ps_lens
g["lens_coherence_spectrum"][batch] = _ps_lens
g["kappa_coherence_spectrum"][batch] = _ps_kappa
g["kappa_coherence_spectrum_reoptimized"][batch] = _ps_kappa2
if batch == 0:
_, f = np.histogram(np.fft.fftfreq(
phys.pixels)[:phys.pixels // 2],
bins=ps_lens.bins)
f = (f[:-1] + f[1:]) / 2
g["lens_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.src_pixels)[:phys.src_pixels // 2],
bins=ps_source.bins)
f = (f[:-1] + f[1:]) / 2
g["source_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.kappa_pixels)[:phys.kappa_pixels // 2],
bins=ps_kappa.bins)
f = (f[:-1] + f[1:]) / 2
g["kappa_frequencies"][:] = f
g["kappa_fov"][0] = phys.kappa_fov
g["source_fov"][0] = phys.src_fov
# Create SIE test
g = hf.create_group(f'SIE_test')
data_len = args.sie_size // N_WORKERS
sie_dataset = test_dataset.skip(data_len *
(THIS_WORKER - 1)).take(data_len)
g.create_dataset(name="lens",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(name="psf",
shape=[
data_len, physical_params['psf pixels'],
physical_params['psf pixels'], 1
],
dtype=np.float32)
g.create_dataset(name="psf_fwhm", shape=[data_len], dtype=np.float32)
g.create_dataset(name="noise_rms", shape=[data_len], dtype=np.float32)
g.create_dataset(name="source",
shape=[data_len, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
g.create_dataset(
name="kappa",
shape=[data_len, phys.kappa_pixels, phys.kappa_pixels, 1],
dtype=np.float32)
g.create_dataset(name="lens_pred",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(name="lens_pred2",
shape=[data_len, phys.pixels, phys.pixels, 1],
dtype=np.float32)
g.create_dataset(
name="source_pred",
shape=[data_len, rim.steps, phys.src_pixels, phys.src_pixels, 1],
dtype=np.float32)
g.create_dataset(name="kappa_pred",
shape=[
data_len, rim.steps, phys.kappa_pixels,
phys.kappa_pixels, 1
],
dtype=np.float32)
g.create_dataset(name="chi_squared",
shape=[data_len, rim.steps],
dtype=np.float32)
g.create_dataset(name="lens_coherence_spectrum",
shape=[data_len, args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_coherence_spectrum",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="lens_coherence_spectrum2",
shape=[data_len, args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_coherence_spectrum2",
shape=[data_len, args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_coherence_spectrum",
shape=[data_len, args.kappa_coherence_bins],
dtype=np.float32)
g.create_dataset(name="lens_frequencies",
shape=[args.lens_coherence_bins],
dtype=np.float32)
g.create_dataset(name="source_frequencies",
shape=[args.source_coherence_bins],
dtype=np.float32)
g.create_dataset(name="kappa_frequencies",
shape=[args.kappa_coherence_bins],
dtype=np.float32)
g.create_dataset(name="einstein_radius",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="position",
shape=[data_len, 2],
dtype=np.float32)
g.create_dataset(name="orientation",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="ellipticity",
shape=[data_len],
dtype=np.float32)
g.create_dataset(name="kappa_fov", shape=[1], dtype=np.float32)
g.create_dataset(name="source_fov", shape=[1], dtype=np.float32)
g.create_dataset(name="lens_fov", shape=[1], dtype=np.float32)
for batch, (_, source, _, noise_rms, psf, fwhm) in enumerate(
sie_dataset.take(data_len).batch(args.batch_size).prefetch(
tf.data.experimental.AUTOTUNE)):
batch_size = source.shape[0]
# Create some SIE kappa maps
_r = tf.random.uniform(shape=[batch_size, 1, 1, 1],
minval=0,
maxval=args.max_shift)
_theta = tf.random.uniform(shape=[batch_size, 1, 1, 1],
minval=-np.pi,
maxval=np.pi)
x0 = _r * tf.math.cos(_theta)
y0 = _r * tf.math.sin(_theta)
ellipticity = tf.random.uniform(shape=[batch_size, 1, 1, 1],
minval=0.,
maxval=args.max_ellipticity)
phi = tf.random.uniform(shape=[batch_size, 1, 1, 1],
minval=-np.pi,
maxval=np.pi)
einstein_radius = tf.random.uniform(shape=[batch_size, 1, 1, 1],
minval=args.min_theta_e,
maxval=args.max_theta_e)
kappa = phys_sie.kappa_field(x0=x0,
y0=y0,
e=ellipticity,
phi=phi,
r_ein=einstein_radius)
lens = phys.noisy_forward(source,
kappa,
noise_rms=noise_rms,
psf=psf)
# Compute predictions for kappa and source
source_pred, kappa_pred, chi_squared = rim.predict(
lens, noise_rms, psf)
lens_pred = phys.forward(source_pred[-1], kappa_pred[-1], psf)
# Compute Power spectrum of converged predictions
_ps_lens = ps_lens.cross_correlation_coefficient(
lens[..., 0], lens_pred[..., 0])
_ps_kappa = ps_kappa.cross_correlation_coefficient(
log_10(kappa)[..., 0],
log_10(kappa_pred[-1])[..., 0])
_ps_source = ps_source.cross_correlation_coefficient(
source[..., 0], source_pred[-1][..., 0])
# save results
i_begin = batch * args.batch_size
i_end = i_begin + batch_size
g["lens"][i_begin:i_end] = lens.numpy().astype(np.float32)
g["psf"][i_begin:i_end] = psf.numpy().astype(np.float32)
g["psf_fwhm"][i_begin:i_end] = fwhm.numpy().astype(np.float32)
g["noise_rms"][i_begin:i_end] = noise_rms.numpy().astype(
np.float32)
g["source"][i_begin:i_end] = source.numpy().astype(np.float32)
g["kappa"][i_begin:i_end] = kappa.numpy().astype(np.float32)
g["lens_pred"][i_begin:i_end] = lens_pred.numpy().astype(
np.float32)
g["source_pred"][i_begin:i_end] = tf.transpose(
source_pred, perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
g["kappa_pred"][i_begin:i_end] = tf.transpose(
kappa_pred, perm=(1, 0, 2, 3, 4)).numpy().astype(np.float32)
g["chi_squared"][i_begin:i_end] = 2 * tf.transpose(
chi_squared).numpy().astype(np.float32)
g["lens_coherence_spectrum"][i_begin:i_end] = _ps_lens.numpy(
).astype(np.float32)
g["source_coherence_spectrum"][i_begin:i_end] = _ps_source.numpy(
).astype(np.float32)
g["kappa_coherence_spectrum"][i_begin:i_end] = _ps_kappa.numpy(
).astype(np.float32)
g["einstein_radius"][
i_begin:i_end] = einstein_radius[:, 0, 0,
0].numpy().astype(np.float32)
g["position"][i_begin:i_end] = tf.stack(
[x0[:, 0, 0, 0], y0[:, 0, 0, 0]],
axis=1).numpy().astype(np.float32)
g["ellipticity"][i_begin:i_end] = ellipticity[:, 0, 0,
0].numpy().astype(
np.float32)
g["orientation"][i_begin:i_end] = phi[:, 0, 0,
0].numpy().astype(np.float32)
if batch == 0:
_, f = np.histogram(np.fft.fftfreq(phys.pixels)[:phys.pixels //
2],
bins=ps_lens.bins)
f = (f[:-1] + f[1:]) / 2
g["lens_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.src_pixels)[:phys.src_pixels // 2],
bins=ps_source.bins)
f = (f[:-1] + f[1:]) / 2
g["source_frequencies"][:] = f
_, f = np.histogram(np.fft.fftfreq(
phys.kappa_pixels)[:phys.kappa_pixels // 2],
bins=ps_kappa.bins)
f = (f[:-1] + f[1:]) / 2
g["kappa_frequencies"][:] = f
g["kappa_fov"][0] = phys.kappa_fov
g["source_fov"][0] = phys.src_fov
def distributed_strategy(args):
kappa_datasets = []
for path in args.kappa_datasets:
files = glob.glob(os.path.join(path, "*.tfrecords"))
files = tf.data.Dataset.from_tensor_slices(files).shuffle(
len(files), reshuffle_each_iteration=True)
dataset = files.interleave(lambda x: tf.data.TFRecordDataset(
x, compression_type=args.compression_type),
block_length=args.block_length,
num_parallel_calls=tf.data.AUTOTUNE)
kappa_datasets.append(
dataset.shuffle(args.buffer_size, reshuffle_each_iteration=True))
kappa_dataset = tf.data.experimental.sample_from_datasets(
kappa_datasets, weights=args.kappa_datasets_weights)
# Read off global parameters from first example in dataset
for example in kappa_dataset.map(decode_kappa_info):
kappa_fov = example["kappa fov"].numpy()
kappa_pixels = example["kappa pixels"].numpy()
break
kappa_dataset = kappa_dataset.map(decode_kappa).batch(args.batch_size)
cosmos_datasets = []
for path in args.cosmos_datasets:
files = glob.glob(os.path.join(path, "*.tfrecords"))
files = tf.data.Dataset.from_tensor_slices(files).shuffle(
len(files), reshuffle_each_iteration=True)
dataset = files.interleave(lambda x: tf.data.TFRecordDataset(
x, compression_type=args.compression_type),
block_length=args.block_length,
num_parallel_calls=tf.data.AUTOTUNE)
cosmos_datasets.append(
dataset.shuffle(args.buffer_size, reshuffle_each_iteration=True))
cosmos_dataset = tf.data.experimental.sample_from_datasets(
cosmos_datasets, weights=args.cosmos_datasets_weights)
# Read off global parameters from first example in dataset
for src_pixels in cosmos_dataset.map(decode_cosmos_info):
src_pixels = src_pixels.numpy()
break
cosmos_dataset = cosmos_dataset.map(decode_cosmos).map(
preprocess_cosmos).batch(args.batch_size)
window = tukey(src_pixels, alpha=args.tukey_alpha)
window = np.outer(window, window)[np.newaxis, ..., np.newaxis]
window = tf.constant(window, dtype=DTYPE)
phys = PhysicalModel(image_fov=kappa_fov,
src_fov=args.source_fov,
pixels=args.lens_pixels,
kappa_pixels=kappa_pixels,
src_pixels=src_pixels,
kappa_fov=kappa_fov,
method="conv2d")
noise_a = (args.noise_rms_min - args.noise_rms_mean) / args.noise_rms_std
noise_b = (args.noise_rms_max - args.noise_rms_mean) / args.noise_rms_std
psf_a = (args.psf_fwhm_min - args.psf_fwhm_mean) / args.psf_fwhm_std
psf_b = (args.psf_fwhm_max - args.psf_fwhm_mean) / args.psf_fwhm_std
options = tf.io.TFRecordOptions(compression_type=args.compression_type)
with tf.io.TFRecordWriter(
os.path.join(args.output_dir, f"data_{THIS_WORKER}.tfrecords"),
options) as writer:
print(
f"Started worker {THIS_WORKER} at {datetime.now().strftime('%y-%m-%d_%H-%M-%S')}"
)
for i in range((THIS_WORKER - 1) * args.batch_size, args.len_dataset,
N_WORKERS * args.batch_size):
for galaxies in cosmos_dataset: # select a random batch from our dataset that is reshuffled each iterations
break
for kappa in kappa_dataset:
break
galaxies = window * galaxies
noise_rms = truncnorm.rvs(noise_a,
noise_b,
loc=args.noise_rms_mean,
scale=args.noise_rms_std,
size=args.batch_size)
fwhm = truncnorm.rvs(psf_a,
psf_b,
loc=args.psf_fwhm_mean,
scale=args.psf_fwhm_std,
size=args.batch_size)
psf = phys.psf_models(fwhm, cutout_size=args.psf_cutout_size)
lensed_images = phys.noisy_forward(galaxies,
kappa,
noise_rms=noise_rms,
psf=psf)
records = encode_examples(kappa=kappa,
galaxies=galaxies,
lensed_images=lensed_images,
z_source=args.z_source,
z_lens=args.z_lens,
image_fov=phys.image_fov,
kappa_fov=phys.kappa_fov,
source_fov=args.source_fov,
noise_rms=noise_rms,
psf=psf,
fwhm=fwhm)
for record in records:
writer.write(record)
print(f"Finished work at {datetime.now().strftime('%y-%m-%d_%H-%M-%S')}")
def __init__(self,
observation,
noise_rms,
psf,
phys: PhysicalModel,
rim: RIM,
source_vae: VAE,
kappa_vae: VAE,
n_samples=100,
sigma_source=0.5,
sigma_kappa=0.5):
"""
Make a copy of initial parameters \varphi^{(0)} and compute the Fisher diagonal F_{ii}
"""
wk = tf.keras.layers.Lambda(lambda k: tf.sqrt(k) / tf.reduce_sum(
tf.sqrt(k), axis=(1, 2, 3), keepdims=True))
# Baseline prediction from observation
source_pred, kappa_pred, chi_squared = rim.predict(
observation, noise_rms, psf)
# Latent code of model predictions
z_source, _ = source_vae.encoder(source_pred[-1])
z_kappa, _ = kappa_vae.encoder(log_10(kappa_pred[-1]))
# Deepcopy of the initial parameters
self.initial_params = [
deepcopy(w) for w in rim.unet.trainable_variables
]
self.fisher_diagonal = [tf.zeros_like(w) for w in self.initial_params]
for n in range(n_samples):
# Sample latent code around the prediction mean
z_s = tf.random.normal(shape=[1, source_vae.latent_size],
mean=z_source,
stddev=sigma_source)
z_k = tf.random.normal(shape=[1, kappa_vae.latent_size],
mean=z_kappa,
stddev=sigma_kappa)
# Decode
sampled_source = tf.nn.relu(source_vae.decode(z_s))
sampled_source /= tf.reduce_max(sampled_source,
axis=(1, 2, 3),
keepdims=True)
sampled_kappa = kappa_vae.decode(z_k) # output in log_10 space
# Simulate observation
sampled_observation = phys.noisy_forward(sampled_source,
10**sampled_kappa,
noise_rms, psf)
# Compute the gradient of the MSE
with tf.GradientTape() as tape:
tape.watch(rim.unet.trainable_variables)
s, k, chi_squared = rim.call(sampled_observation, noise_rms,
psf)
# Remove the temperature from the loss when computing the Fisher: sum instead of mean, and weighted sum is renormalized by number of pixels
_kappa_mse = phys.kappa_pixels**2 * tf.reduce_sum(
wk(10**sampled_kappa) * (k - sampled_kappa)**2,
axis=(2, 3, 4))
cost = tf.reduce_sum(_kappa_mse)
cost += tf.reduce_sum((s - sampled_source)**2)
grad = tape.gradient(cost, rim.unet.trainable_variables)
# Square the derivative relative to initial parameters and add to total
self.fisher_diagonal = [
F + g**2 / n_samples
for F, g in zip(self.fisher_diagonal, grad)
]