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PREVENT 1D DISTRIBUTION #633

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merged 2 commits into from
Dec 27, 2023
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PREVENT 1D DISTRIBUTION #633

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PREVENT 1D DISTRIBUTION
reubenharry Dec 27, 2023
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PREVENT 1D DISTRIBUTION
reubenharry Dec 27, 2023
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6 changes: 5 additions & 1 deletion blackjax/mcmc/mclmc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@
from blackjax.base import SamplingAlgorithm
from blackjax.mcmc.integrators import IntegratorState, isokinetic_mclachlan
from blackjax.types import ArrayLike, PRNGKey
from blackjax.util import generate_unit_vector
from blackjax.util import generate_unit_vector, pytree_size

__all__ = ["MCLMCInfo", "init", "build_kernel", "mclmc"]

Expand All @@ -45,6 +45,10 @@


def init(position: ArrayLike, logdensity_fn, rng_key):
if pytree_size(position) < 2:
raise ValueError(

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Added line #L49 was not covered by tests
"The target distribution must have more than 1 dimension for MCLMC."
)
l, g = jax.value_and_grad(logdensity_fn)(position)

return IntegratorState(
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