Thomas D. Ahle
University of Copenhagen
26 Papers
77 Citations
Thomas D. Ahle is an academic researcher from University of Copenhagen. The author has contributed to research in topics: Computer science & Nearest neighbor search. The author has an hindex of 7, co-authored 19 publications. Previous affiliations of Thomas D. Ahle include IT University & IT University of Copenhagen.
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Papers
On the Complexity of Inner Product Similarity Join
Thomas D. Ahle,Rasmus Pagh,Ilya Razenshteyn,Francesco Silvestri +3 more
- 15 Jun 2016
TL;DR: A systematic study of inner product similarity join, showing new lower and upper bounds for (A)LSH-based algorithms and showing that asymmetry can be avoided by relaxing the LSH definition to only consider the collision probability of distinct elements.
55
•Proceedings Article
Oblivious sketching of high-degree polynomial kernels
Thomas D. Ahle,Michael Kapralov,Jakob Bæk Tejs Knudsen,Rasmus Pagh,Ameya Velingker,David P. Woodruff,Amir Zandieh +6 more
- 05 Jan 2020
TL;DR: This work is a general method for applying sketching solutions developed in numerical linear algebra over the past decade to a tensoring of data points without forming the tensoring explicitly, and leads to the first oblivious sketch for the polynomial kernel with a target dimension that is only polynomially dependent on the degree of the kernel function.
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On the Complexity of Inner Product Similarity Join
TL;DR: In this paper, a systematic study of inner product similarity join (IPS join) has been conducted, showing new lower and upper bounds on the hardness of IPS join, including new asymmetric embeddings.
34
•Posted Content
Oblivious Sketching of High-Degree Polynomial Kernels.
Thomas D. Ahle,Michael Kapralov,Jakob Bæk Tejs Knudsen,Rasmus Pagh,Ameya Velingker,David P. Woodruff,Amir Zandieh +6 more
TL;DR: Oblivious sketching has emerged as a powerful approach to speeding up numerical linear algebra over the past decade, but our understanding of oblivious sketching solutions for kernel matrices has remained quite limited, suffering from the aforementioned exponential dependence on input parameters.
25
•Posted Content
Optimal Las Vegas Locality Sensitive Data Structures
TL;DR: In this article, it was shown that approximate similarity search can be solved in high dimensions with performance matching state-of-the-art LSH, but with a guarantee of no false negatives.
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