Search Results for author: Wonyeol Lee

Found 8 papers, 3 papers with code

Expressive Power of ReLU and Step Networks under Floating-Point Operations

no code implementations26 Jan 2024 Yeachan Park, Geonho Hwang, Wonyeol Lee, Sejun Park

In this work, we analyze the expressive power of neural networks under a more realistic setup: when we use floating-point numbers and operations.

Memorization

Training with Mixed-Precision Floating-Point Assignments

no code implementations31 Jan 2023 Wonyeol Lee, Rahul Sharma, Alex Aiken

Hence, it is important to use a precision assignment -- a mapping from all tensors (arising in training) to precision levels (high or low) -- that keeps most of the tensors in low precision and leads to sufficiently accurate models.

Image Classification

On the Correctness of Automatic Differentiation for Neural Networks with Machine-Representable Parameters

no code implementations31 Jan 2023 Wonyeol Lee, Sejun Park, Alex Aiken

For a neural network with bias parameters, we first prove that the incorrect set is always empty.

Smoothness Analysis for Probabilistic Programs with Application to Optimised Variational Inference

1 code implementation22 Aug 2022 Wonyeol Lee, Xavier Rival, Hongseok Yang

We present a static analysis for discovering differentiable or more generally smooth parts of a given probabilistic program, and show how the analysis can be used to improve the pathwise gradient estimator, one of the most popular methods for posterior inference and model learning.

Variational Inference

On Correctness of Automatic Differentiation for Non-Differentiable Functions

no code implementations NeurIPS 2020 Wonyeol Lee, Hangyeol Yu, Xavier Rival, Hongseok Yang

For these PAP functions, we propose a new type of derivatives, called intensional derivatives, and prove that these derivatives always exist and coincide with standard derivatives for almost all inputs.

Differentiable Algorithm for Marginalising Changepoints

no code implementations22 Nov 2019 Hyoungjin Lim, Gwonsoo Che, Wonyeol Lee, Hongseok Yang

We present an algorithm for marginalising changepoints in time-series models that assume a fixed number of unknown changepoints.

Time Series Time Series Analysis

Towards Verified Stochastic Variational Inference for Probabilistic Programs

1 code implementation20 Jul 2019 Wonyeol Lee, Hangyeol Yu, Xavier Rival, Hongseok Yang

In this paper, we analyse one of the most fundamental and versatile variational inference algorithms, called score estimator, using tools from denotational semantics and program analysis.

Probabilistic Programming Variational Inference

Reparameterization Gradient for Non-differentiable Models

1 code implementation NeurIPS 2018 Wonyeol Lee, Hangyeol Yu, Hongseok Yang

We tackle the challenge by generalizing the reparameterization trick, one of the most effective techniques for addressing the variance issue for differentiable models, so that the trick works for non-differentiable models as well.

Variational Inference

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