Search Results for author: Nick McGreivy

Found 4 papers, 1 papers with code

Invariant preservation in machine learned PDE solvers via error correction

no code implementations28 Mar 2023 Nick McGreivy, Ammar Hakim

Though this strategy is different from how standard solvers preserve invariants, it is necessary to retain the flexibility that allows machine learned solvers to be accurate at large $\Delta x$ and/or $\Delta t$.

Meta-PDE: Learning to Solve PDEs Quickly Without a Mesh

no code implementations3 Nov 2022 Tian Qin, Alex Beatson, Deniz Oktay, Nick McGreivy, Ryan P. Adams

Partial differential equations (PDEs) are often computationally challenging to solve, and in many settings many related PDEs must be be solved either at every timestep or for a variety of candidate boundary conditions, parameters, or geometric domains.

Meta-Learning

Convolutional layers are equivariant to discrete shifts but not continuous translations

no code implementations10 Jun 2022 Nick McGreivy, Ammar Hakim

This is because shift equivariance is a discrete symmetry while translation equivariance is a continuous symmetry.

Translation

Randomized Automatic Differentiation

1 code implementation ICLR 2021 Deniz Oktay, Nick McGreivy, Joshua Aduol, Alex Beatson, Ryan P. Adams

The successes of deep learning, variational inference, and many other fields have been aided by specialized implementations of reverse-mode automatic differentiation (AD) to compute gradients of mega-dimensional objectives.

Stochastic Optimization Variational Inference

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