Efficient Wind Speed Nowcasting with GPU-Accelerated Nearest Neighbors Algorithm

• URL: http://arxiv.org/abs/2112.10408v1
• Date: Mon, 20 Dec 2021 09:15:27 GMT
• Title: Efficient Wind Speed Nowcasting with GPU-Accelerated Nearest Neighbors Algorithm
• Authors: Arnaud Pannatier, Ricardo Picatoste, Fran\c{c}ois Fleuret
• Abstract summary: This paper proposes a simple yet efficient high-altitude wind nowcasting pipeline. It processes efficiently a vast amount of live data recorded by airplanes over the whole airspace. It creates a unique context for each point in the dataset and then extrapolates from it.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: This paper proposes a simple yet efficient high-altitude wind nowcasting pipeline. It processes efficiently a vast amount of live data recorded by airplanes over the whole airspace and reconstructs the wind field with good accuracy. It creates a unique context for each point in the dataset and then extrapolates from it. As creating such context is computationally intensive, this paper proposes a novel algorithm that reduces the time and memory cost by efficiently fetching nearest neighbors in a data set whose elements are organized along smooth trajectories that can be approximated with piece-wise linear structures. We introduce an efficient and exact strategy implemented through algebraic tensorial operations, which is well-suited to modern GPU-based computing infrastructure. This method employs a scalable Euclidean metric and allows masking data points along one dimension. When applied, this method is more efficient than plain Euclidean k-NN and other well-known data selection methods such as KDTrees and provides a several-fold speedup. We provide an implementation in PyTorch and a novel data set to allow the replication of empirical results.

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