447 research outputs found
Professor Karl Morgenstern : zur Erinnerung seines Andenkens
https://www.ester.ee/record=b1434291*es
Functions Returning Values of Dynamic Size
Modern programming languages, such as Ada (Ichbiah 80), permit the definition of functions that return values whose size can not be determined until the function returns. This paper discusses five implementation techniques that can be used to implement this capability. Comparisons of the techniques are provided and guidelines for selecting a particular technique for a compiler are given
Fast Nonlinear Vector Quantile Regression
Quantile regression (QR) is a powerful tool for estimating one or more
conditional quantiles of a target variable given explanatory
features . A limitation of QR is that it is only
defined for scalar target variables, due to the formulation of its objective
function, and since the notion of quantiles has no standard definition for
multivariate distributions. Recently, vector quantile regression (VQR) was
proposed as an extension of QR for vector-valued target variables, thanks to a
meaningful generalization of the notion of quantiles to multivariate
distributions via optimal transport. Despite its elegance, VQR is arguably not
applicable in practice due to several limitations: (i) it assumes a linear
model for the quantiles of the target given the
features ; (ii) its exact formulation is intractable
even for modestly-sized problems in terms of target dimensions, number of
regressed quantile levels, or number of features, and its relaxed dual
formulation may violate the monotonicity of the estimated quantiles; (iii) no
fast or scalable solvers for VQR currently exist. In this work we fully address
these limitations, namely: (i) We extend VQR to the non-linear case, showing
substantial improvement over linear VQR; (ii) We propose {vector monotone
rearrangement}, a method which ensures the quantile functions estimated by VQR
are monotone functions; (iii) We provide fast, GPU-accelerated solvers for
linear and nonlinear VQR which maintain a fixed memory footprint, and
demonstrate that they scale to millions of samples and thousands of quantile
levels; (iv) We release an optimized python package of our solvers as to
widespread the use of VQR in real-world applications.Comment: 35 pages, 15 figures, code: https://github.com/vistalab-technion/vq
Literaturwissenschaft und Literaturforschung an der ehemaligen Universität Dorpat : ein historischer Rückblick
Digiteeritud Euroopa Regionaalarengu Fondi rahastusel, projekti "Eesti teadus- ja õppekirjandus" (2014-2020.12.03.21-0848) raames.https://www.ester.ee/record=b4259601*es
Vector Quantile Regression on Manifolds
Quantile regression (QR) is a statistical tool for distribution-free
estimation of conditional quantiles of a target variable given explanatory
features. QR is limited by the assumption that the target distribution is
univariate and defined on an Euclidean domain. Although the notion of quantiles
was recently extended to multi-variate distributions, QR for multi-variate
distributions on manifolds remains underexplored, even though many important
applications inherently involve data distributed on, e.g., spheres (climate and
geological phenomena), and tori (dihedral angles in proteins). By leveraging
optimal transport theory and c-concave functions, we meaningfully define
conditional vector quantile functions of high-dimensional variables on
manifolds (M-CVQFs). Our approach allows for quantile estimation, regression,
and computation of conditional confidence sets and likelihoods. We demonstrate
the approach's efficacy and provide insights regarding the meaning of
non-Euclidean quantiles through synthetic and real data experiments
Rapid iterative design of tandem-core virus-like particles using Escherichia Coli-based cell-free protein synthesis
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