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ReflectionWalkProposal

fugue::inference::mh

Struct ReflectionWalkProposal 

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pub struct ReflectionWalkProposal {
    pub lower_bound: f64,
    pub upper_bound: f64,
}
Expand description

Reflection-based proposal for bounded continuous distributions (symmetric).

Reflects a Gaussian step off the boundaries to stay within [lower, upper]. Reflection preserves symmetry, so no Hastings correction is needed.

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§lower_bound: f64

Lower bound (inclusive)

§upper_bound: f64

Upper bound (inclusive)

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impl ProposalStrategy<f64> for ReflectionWalkProposal

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fn propose(&self, current: f64, scale: f64, rng: &mut dyn RngCore) -> f64

Generate a proposal given the current value and scale.
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fn log_proposal_prob(&self, from: T, to: T, scale: f64) -> f64

Log-density log q(to | from) of proposing to from from at the given scale. Defaults to 0 for symmetric proposals (the constant cancels in the Hastings ratio); asymmetric proposals override it.

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