Search Results for author: Alexander K. Lew

Found 8 papers, 6 papers with code

From Word Models to World Models: Translating from Natural Language to the Probabilistic Language of Thought

1 code implementation22 Jun 2023 Lionel Wong, Gabriel Grand, Alexander K. Lew, Noah D. Goodman, Vikash K. Mansinghka, Jacob Andreas, Joshua B. Tenenbaum

Our architecture integrates two computational tools that have not previously come together: we model thinking with probabilistic programs, an expressive representation for commonsense reasoning; and we model meaning construction with large language models (LLMs), which support broad-coverage translation from natural language utterances to code expressions in a probabilistic programming language.

Probabilistic Programming Relational Reasoning

Differentiating Metropolis-Hastings to Optimize Intractable Densities

1 code implementation13 Jun 2023 Gaurav Arya, Ruben Seyer, Frank Schäfer, Kartik Chandra, Alexander K. Lew, Mathieu Huot, Vikash K. Mansinghka, Jonathan Ragan-Kelley, Christopher Rackauckas, Moritz Schauer

We develop an algorithm for automatic differentiation of Metropolis-Hastings samplers, allowing us to differentiate through probabilistic inference, even if the model has discrete components within it.

Sequential Monte Carlo Steering of Large Language Models using Probabilistic Programs

2 code implementations5 Jun 2023 Alexander K. Lew, Tan Zhi-Xuan, Gabriel Grand, Vikash K. Mansinghka

Even after fine-tuning and reinforcement learning, large language models (LLMs) can be difficult, if not impossible, to control reliably with prompts alone.

Language Modelling Probabilistic Programming +1

$ω$PAP Spaces: Reasoning Denotationally About Higher-Order, Recursive Probabilistic and Differentiable Programs

no code implementations21 Feb 2023 Mathieu Huot, Alexander K. Lew, Vikash K. Mansinghka, Sam Staton

We introduce a new setting, the category of $\omega$PAP spaces, for reasoning denotationally about expressive differentiable and probabilistic programming languages.

Probabilistic Programming

Recursive Monte Carlo and Variational Inference with Auxiliary Variables

1 code implementation5 Mar 2022 Alexander K. Lew, Marco Cusumano-Towner, Vikash K. Mansinghka

A key design constraint when implementing Monte Carlo and variational inference algorithms is that it must be possible to cheaply and exactly evaluate the marginal densities of proposal distributions and variational families.

Astronomy Stochastic Optimization +1

PClean: Bayesian Data Cleaning at Scale with Domain-Specific Probabilistic Programming

1 code implementation23 Jul 2020 Alexander K. Lew, Monica Agrawal, David Sontag, Vikash K. Mansinghka

Data cleaning is naturally framed as probabilistic inference in a generative model of ground-truth data and likely errors, but the diversity of real-world error patterns and the hardness of inference make Bayesian approaches difficult to automate.

Probabilistic Programming

Automating Involutive MCMC using Probabilistic and Differentiable Programming

2 code implementations20 Jul 2020 Marco Cusumano-Towner, Alexander K. Lew, Vikash K. Mansinghka

Involutive MCMC is a unifying mathematical construction for MCMC kernels that generalizes many classic and state-of-the-art MCMC algorithms, from reversible jump MCMC to kernels based on deep neural networks.

Computation

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