update_lazy_gamma_poisson

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function update_lazy_gamma_poisson(x:Expression<Integer>, k:Expression<Real>, θ:Expression<Real>) -> (Expression<Real>, Expression<Real>)

Update the parameters of a Gamma distribution with a Poisson likelihood.

• x: The variate.
• k: Prior shape.
• θ: Prior scale.

Returns: the posterior hyperparameters k' and θ'.