bf.dist.bernoulli: Sample from a Bernoulli distribution.

In BayesForge: Bayesian Inference using 'numpyro' and 'XLA'

Sample from a Bernoulli distribution.

Description

The Bernoulli distribution models a single binary event (success or failure), parameterized by the log-odds ratio of success. The probability of success is given by the sigmoid function applied to the logit.

p = \sigma(\eta) = \frac{1}{1 + e^{-\eta}}

where

\eta

is the log-odds (the *logit*).

Usage

bf.dist.bernoulli(
  probs = py_none(),
  logits = py_none(),
  validate_args = py_none(),
  name = "x",
  obs = py_none(),
  mask = py_none(),
  sample = FALSE,
  seed = py_none(),
  shape = c(),
  event = 0,
  create_obj = FALSE,
  to_jax = TRUE
)

Arguments

probs	A numeric vector, matrix, or array representing the probability of success for each Bernoulli trial. Must be between 0 and 1.
logits	A numeric vector, matrix, or array representing the log-odds of success for each Bernoulli trial.
validate_args	Logical: Whether to validate parameter values. Defaults to 'reticulate::py_none()'.
name	A character string representing the name of the random variable within a model. This is used to uniquely identify the variable. Defaults to 'x'.
obs	A numeric vector or array of observed values. If provided, the random variable is conditioned on these values. If 'NULL', the variable is treated as a latent (unobserved) variable. Defaults to 'NULL'.
mask	A logical vector, matrix, or array (optional) to mask observations.
sample	A logical value that controls the function's behavior. If 'TRUE', the function will directly draw samples from the distribution. If 'FALSE', it will create a random variable within a model. Defaults to 'FALSE'.
seed	An integer used to set the random seed for reproducibility when 'sample = TRUE'. This argument has no effect when 'sample = FALSE', as randomness is handled by the model's inference engine. Defaults to 0.
shape	A numeric vector specifying the shape of the output. Used with ‘.expand(shape)' when 'sample=False' (model building) to set the distribution’s batch shape. When 'sample=True' (direct sampling), this is used as 'sample_shape' to draw a raw JAX array of the given shape.
event	An integer indicating the number of batch dimensions to reinterpret as event dimensions (used in model building).
create_obj	A logical value (optional). If 'TRUE', returns the raw BI distribution object instead of creating a sample site.
to_jax	Boolean. Indicates whether to return a JAX array or not.

Value

- When sample=FALSE, a BI Bernoulli distribution object (for model building).

- When sample=TRUE, a JAX array of samples drawn from the Bernoulli distribution (for direct sampling).

- When create_obj=TRUE, the raw BI distribution object (for advanced use cases).

Examples

library(BayesForge)
m=importBF(platform='cpu')
bf.dist.bernoulli(probs = 0.5, sample = TRUE)
bf.dist.bernoulli(probs = 0.5, sample = TRUE, seed = 5)
bf.dist.bernoulli(logits = 1, sample = TRUE, seed = 5)

BayesForge documentation built on June 9, 2026, 1:09 a.m.