Search Results for author: Alexander Keller

Found 20 papers, 9 papers with code

Compact Neural Graphics Primitives with Learned Hash Probing

no code implementations28 Dec 2023 Towaki Takikawa, Thomas Müller, Merlin Nimier-David, Alex Evans, Sanja Fidler, Alec Jacobson, Alexander Keller

Neural graphics primitives are faster and achieve higher quality when their neural networks are augmented by spatial data structures that hold trainable features arranged in a grid.

Quantization

Learning Radio Environments by Differentiable Ray Tracing

no code implementations30 Nov 2023 Jakob Hoydis, Fayçal Aït Aoudia, Sebastian Cammerer, Florian Euchner, Merlin Nimier-David, Stephan ten Brink, Alexander Keller

Ray tracing (RT) is instrumental in 6G research in order to generate spatially-consistent and environment-specific channel impulse responses (CIRs).

Adaptive Shells for Efficient Neural Radiance Field Rendering

no code implementations16 Nov 2023 Zian Wang, Tianchang Shen, Merlin Nimier-David, Nicholas Sharp, Jun Gao, Alexander Keller, Sanja Fidler, Thomas Müller, Zan Gojcic

We then extract an explicit mesh of a narrow band around the surface, with width determined by the kernel size, and fine-tune the radiance field within this band.

Novel View Synthesis Stochastic Optimization

Graph Neural Networks for Channel Decoding

1 code implementation29 Jul 2022 Sebastian Cammerer, Jakob Hoydis, Fayçal Aït Aoudia, Alexander Keller

In this work, we propose a fully differentiable graph neural network (GNN)-based architecture for channel decoding and showcase a competitive decoding performance for various coding schemes, such as low-density parity-check (LDPC) and BCH codes.

GPU-Accelerated Machine Learning in Non-Orthogonal Multiple Access

no code implementations13 Jun 2022 Daniel Schäufele, Guillermo Marcus, Nikolaus Binder, Matthias Mehlhose, Alexander Keller, Sławomir Stańczak

Non-orthogonal multiple access (NOMA) is an interesting technology that enables massive connectivity as required in future 5G and 6G networks.

BIG-bench Machine Learning

Deep Learning-Based Synchronization for Uplink NB-IoT

1 code implementation22 May 2022 Fayçal Aït Aoudia, Jakob Hoydis, Sebastian Cammerer, Matthijs Van Keirsbilck, Alexander Keller

We propose a neural network (NN)-based algorithm for device detection and time of arrival (ToA) and carrier frequency offset (CFO) estimation for the narrowband physical random-access channel (NPRACH) of narrowband internet of things (NB-IoT).

Benchmarking

RTMV: A Ray-Traced Multi-View Synthetic Dataset for Novel View Synthesis

no code implementations14 May 2022 Jonathan Tremblay, Moustafa Meshry, Alex Evans, Jan Kautz, Alexander Keller, Sameh Khamis, Thomas Müller, Charles Loop, Nathan Morrical, Koki Nagano, Towaki Takikawa, Stan Birchfield

We present a large-scale synthetic dataset for novel view synthesis consisting of ~300k images rendered from nearly 2000 complex scenes using high-quality ray tracing at high resolution (1600 x 1600 pixels).

Novel View Synthesis

Instant Neural Graphics Primitives with a Multiresolution Hash Encoding

16 code implementations16 Jan 2022 Thomas Müller, Alex Evans, Christoph Schied, Alexander Keller

Neural graphics primitives, parameterized by fully connected neural networks, can be costly to train and evaluate.

3D Reconstruction 3D Shape Reconstruction +2

GPU-accelerated partially linear multiuser detection for 5G and beyond URLLC systems

1 code implementation13 Jan 2022 Matthias Mehlhose, Guillermo Marcus, Daniel Schäufele, Daniyal Amir Awan, Nikolaus Binder, Martin Kasparick, Renato L. G. Cavalcante, Sławomir Stańczak, Alexander Keller

In this feasibility study, we have implemented a recently proposed partially linear multiuser detection algorithm in reproducing kernel Hilbert spaces (RKHSs) on a GPU-accelerated platform.

Real-time Neural Radiance Caching for Path Tracing

2 code implementations23 Jun 2021 Thomas Müller, Fabrice Rousselle, Jan Novák, Alexander Keller

Since pretraining neural networks to handle novel, dynamic scenes is a formidable generalization challenge, we do away with pretraining and instead achieve generalization via adaptation, i. e. we opt for training the radiance cache while rendering.

Neural Radiance Caching

Compressing 1D Time-Channel Separable Convolutions using Sparse Random Ternary Matrices

no code implementations31 Mar 2021 Gonçalo Mordido, Matthijs Van Keirsbilck, Alexander Keller

We demonstrate that 1x1-convolutions in 1D time-channel separable convolutions may be replaced by constant, sparse random ternary matrices with weights in $\{-1, 0,+1\}$.

speech-recognition Speech Recognition

Neural Control Variates

no code implementations2 Jun 2020 Thomas Müller, Fabrice Rousselle, Jan Novák, Alexander Keller

We propose neural control variates (NCV) for unbiased variance reduction in parametric Monte Carlo integration.

Instant Quantization of Neural Networks using Monte Carlo Methods

no code implementations29 May 2019 Gonçalo Mordido, Matthijs Van Keirsbilck, Alexander Keller

Low bit-width integer weights and activations are very important for efficient inference, especially with respect to lower power consumption.

Quantization

Rethinking Full Connectivity in Recurrent Neural Networks

no code implementations29 May 2019 Matthijs Van Keirsbilck, Alexander Keller, Xiaodong Yang

We study structurally sparse RNNs, showing that they are well suited for acceleration on parallel hardware, with a greatly reduced cost of the recurrent operations as well as orders of magnitude less recurrent weights.

Action Recognition Language Modelling +3

Massively Parallel Construction of Radix Tree Forests for the Efficient Sampling of Discrete Probability Distributions

1 code implementation2 Jan 2019 Nikolaus Binder, Alexander Keller

We compare different methods for sampling from discrete probability distributions and introduce a new algorithm which is especially efficient on massively parallel processors, such as GPUs.

Distributed, Parallel, and Cluster Computing Graphics

Integral Equations and Machine Learning

no code implementations17 Dec 2017 Alexander Keller, Ken Dahm

As both light transport simulation and reinforcement learning are ruled by the same Fredholm integral equation of the second kind, reinforcement learning techniques may be used for photorealistic image synthesis: Efficiency may be dramatically improved by guiding light transport paths by an approximate solution of the integral equation that is learned during rendering.

BIG-bench Machine Learning Image Generation +2

Learning Light Transport the Reinforced Way

2 code implementations25 Jan 2017 Ken Dahm, Alexander Keller

We show that the equations of reinforcement learning and light transport simulation are related integral equations.

reinforcement-learning Reinforcement Learning (RL)

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