Source code for jax._src.scipy.stats.bernoulli

# Copyright 2018 The JAX Authors.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.

import scipy.stats as osp_stats

from jax import lax
import jax.numpy as jnp
from jax._src.lax.lax import _const as _lax_const
from jax._src.numpy.util import implements, promote_args_inexact
from jax._src.typing import Array, ArrayLike
from jax.scipy.special import xlogy, xlog1py

[docs] @implements(osp_stats.bernoulli.logpmf, update_doc=False) def logpmf(k: ArrayLike, p: ArrayLike, loc: ArrayLike = 0) -> Array: k, p, loc = promote_args_inexact("bernoulli.logpmf", k, p, loc) zero = _lax_const(k, 0) one = _lax_const(k, 1) x = lax.sub(k, loc) log_probs = xlogy(x, p) + xlog1py(lax.sub(one, x), -p) return jnp.where(jnp.logical_or(, zero),, one)), -jnp.inf, log_probs)
[docs] @implements(osp_stats.bernoulli.pmf, update_doc=False) def pmf(k: ArrayLike, p: ArrayLike, loc: ArrayLike = 0) -> Array: return jnp.exp(logpmf(k, p, loc))
[docs] @implements(osp_stats.bernoulli.cdf, update_doc=False) def cdf(k: ArrayLike, p: ArrayLike) -> Array: k, p = promote_args_inexact('bernoulli.cdf', k, p) zero, one = _lax_const(k, 0), _lax_const(k, 1) conds = [ jnp.isnan(k) | jnp.isnan(p) | (p < zero) | (p > one),, zero), jnp.logical_and(, zero),, one)),, one) ] vals = [jnp.nan, zero, one - p, one] return, vals)
[docs] @implements(osp_stats.bernoulli.ppf, update_doc=False) def ppf(q: ArrayLike, p: ArrayLike) -> Array: q, p = promote_args_inexact('bernoulli.ppf', q, p) zero, one = _lax_const(q, 0), _lax_const(q, 1) return jnp.where( jnp.isnan(q) | jnp.isnan(p) | (p < zero) | (p > one) | (q < zero) | (q > one), jnp.nan, jnp.where(lax.le(q, one - p), zero, one) )