A Compositional Atlas of Tractable Circuit Operations for Probabilistic InferenceDownload PDF

21 May 2021, 20:48 (edited 26 Oct 2021)NeurIPS 2021 OralReaders: Everyone
  • Keywords: probabilistic reasoning, tractable inference, probabilistic circuits, sum-product networks
  • TL;DR: We systematically characterize a tractable model class for an inference scenario by building a modular pipeline of atomic operations and thus distilling an efficient algorithm for it
  • Abstract: Circuit representations are becoming the lingua franca to express and reason about tractable generative and discriminative models. In this paper, we show how complex inference scenarios for these models that commonly arise in machine learning---from computing the expectations of decision tree ensembles to information-theoretic divergences of sum-product networks---can be represented in terms of tractable modular operations over circuits. Specifically, we characterize the tractability of simple transformations---sums, products, quotients, powers, logarithms, and exponentials---in terms of sufficient structural constraints of the circuits they operate on, and present novel hardness results for the cases in which these properties are not satisfied. Building on these operations, we derive a unified framework for reasoning about tractable models that generalizes several results in the literature and opens up novel tractable inference scenarios.
  • Supplementary Material: pdf
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  • Code: https://github.com/UCLA-StarAI/circuit-ops-atlas
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