LogNormalGammaPosterior
@Serializable
@SerialName(value = "LogNormalGammaPosterior")
Log-Normal-Gamma posterior: same draw as NormalGammaPosterior but exp-transformed back to the real scale. Intended for arms whose stat already accumulates log-rewards (see LogNormalArm's encode).
sample
Draw a single Monte Carlo sample of the arm's reward from its posterior.