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We present a semantics of a probabilistic while-language, with soft conditioning and continuous distributions, which handles programs diverging with positive probability. To this end, we extend the probabilistic guarded command language (pGCL), which draws from continuous distributions and a score operator. The main contribution is an extension of the standard weakest preexpectation semantics to support these constructs. As a sanity check of our semantics, we define an alternative trace-based semantics of the language and show that the two semantics are equivalent. Various examples illustrate the applicability of the semantics.

Weakest Preexpectation Semantics for Bayesian Inference