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Update initial position sampling
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thomasckng committed Sep 11, 2024
1 parent 17f01fb commit 5c1debb
Showing 1 changed file with 28 additions and 12 deletions.
40 changes: 28 additions & 12 deletions src/jimgw/single_event/likelihood.py
Original file line number Diff line number Diff line change
Expand Up @@ -575,18 +575,34 @@ def y(x):
)

key = jax.random.PRNGKey(0)
initial_position = []
for _ in range(popsize):
flag = True
while flag:
key = jax.random.split(key)[1]
guess = prior.sample(key, 1)
for transform in sample_transforms:
guess = transform.forward(guess)
guess = jnp.array([i for i in guess.values()]).T[0]
flag = not jnp.all(jnp.isfinite(guess))
initial_position.append(guess)
initial_position = jnp.array(initial_position)

initial_position = jnp.zeros((popsize, prior.n_dim)) + jnp.nan
while not jax.tree.reduce(
jnp.logical_and, jax.tree.map(lambda x: jnp.isfinite(x), initial_position)
).all():
non_finite_index = jnp.any(
~jax.tree.reduce(
jnp.logical_and,
jax.tree.map(lambda x: jnp.isfinite(x), initial_position),
),
axis=1,
)

key, subkey = jax.random.split(key)
guess = prior.sample(subkey, popsize)
for transform in sample_transforms:
guess = jax.vmap(transform.forward)(guess)
guess = jnp.array(
jax.tree.leaves({key: guess[key] for key in parameter_names})
).T
finite_guess = jnp.where(
jnp.all(jax.tree.map(lambda x: jnp.isfinite(x), guess), axis=1)
)[0]
common_length = min(len(finite_guess), len(non_finite_index))
initial_position = initial_position.at[
non_finite_index[:common_length]
].set(guess[:common_length])

rng_key, optimized_positions, summary = optimizer.optimize(
jax.random.PRNGKey(12094), y, initial_position
)
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