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Bradley J. Gram-Hansen

2 accepted papers

2022

Amortized Rejection Sampling in Universal Probabilistic Programming

AISTATS 2022poster

Naive approaches to amortized inference in probabilistic programs with unbounded loops can produce estimators with infinite variance. This is particularly true of importance sampling inference in programs that explicitly include rejection sampling as part of the user-programmed generative procedure.…

2019

LF-PPL: A Low-Level First Order Probabilistic Programming Language for Non-Differentiable Models

AISTATS 2019poster

We develop a new Low-level, First-order Probabilistic Programming Language (LF-PPL) suited for models containing a mix of continuous, discrete, and/or piecewise-continuous variables. The key success of this language and its compilation scheme is in its ability to automatically distinguish parameters…