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arXiv research

A locally-built, LLM-digested index of recent arXiv papers in quant finance, geometry/topology, and statistical ML — keyword search served straight from SQLite on this machine.

169,051 papers · 148 categories

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48 results for witnesses

Geometric framework for signed multivariate tail-dependence compatibility at various thresholds.

problem Modeling and analyzing signed multivariate tail-dependence across different thresholds.
method Developed a geometric witness framework to represent and invert signed tail families, identifying nonnegative weights and normalized masses.
result Characterization and synthesis of signed multivariate tail-dependence at finite thresholds, preserving the complete signed tail family throughout.

Proximal Mediation Analysis with Hidden Recanting Witnesses

problem Identifying path-specific effects in mediation analysis when recanting witnesses are unknown
method Proximal causal inference and semiparametric inference framework
result Developed three novel identification strategies and a semiparametric inference framework

A new method detects hidden driving forces in systems with multiple observables.

problem Hidden driving forces in systems with multiple observables cannot be detected by scalar statistics.
method Cross-spectral witness for hidden nonequilibrium.
result Two simultaneously observed channels retain an off-diagonal cross-spectral sector inaccessible to scalar reductions.

New RL algorithms show model-based methods are more efficient than model-free ones in complex decision processes.

problem Efficient reinforcement learning in contextual decision processes with strategic exploration.
method Design of new model-based RL algorithms with sample complexity governed by witness rank.
result Exponential separation between model-based and model-free RL in some rich-observation settings.

In this paper we show that certain generalizations of the CrC^r-Whitney topology, which include the Hölder-Whitney and Sobolev-Whitney topologies on smooth manifolds, satisfy the Baire property, to wit, the countable intersection of open and dense sets is dense.

2018-09-27abs ↗pdf ↗

A new method for analyzing adaptive experiments using kernel treatment effects.

problem Efficiently analyzing adaptive experiments that adjust treatment assignments based on outcomes.
method Kernel Treatment Effects (KTE) framework combining RKHS scores and witness functions.
result Effective for both mean shifts and higher-moment differences, outperforming adaptive baselines.

This note shows how to transform high-probability to in-expectation guarantees in machine learning.

problem The challenge of constructing reliable machine learning models due to sampling randomness.
method Transforming high-probability to in-expectation guarantees using a witness condition for unbounded loss functions.
result A technical transformation method for generalization guarantees in machine learning.

Unified approach for multicalibration in weakly supervised learning.

problem Existing multicalibration methods require clean input-label pairs, which are unavailable in weakly supervised learning.
method Developed estimators and post-hoc correction methods for multicalibration under weak supervision.
result Unified framework for estimating and correcting multicalibration under weak supervision with finite-sample guarantees.

We present new, unified proofs for the cell-like, Z/p\mathbb{Z}/p-, and Q\mathbb{Q}-resolution theorems. Our arguments employ extensions that are much simpler then those used by our predecessors. The techniques allow us to solve problems involving cohomology groups by converting them into problems about homology groups…

2017-06-05abs ↗pdf ↗

New methods estimate causal effects through mediators, handling confounding without strict assumptions.

problem Estimating causal effects through mediators while accounting for unmeasured confounding.
method Developed four nonparametric identification strategies using proximal confounding bridge functions, efficient influence function, and quadruply robust estimator. Proposed proximal debiased machine learning approach for high-dimensional nuisance parameters.
result Achieved n\sqrt{n}-consistency and asymptotic normality for path-specific effect estimation.

Proposes DR-ME test for interpretable distributional treatment effects.

problem Detects invisible differences in treatment effects on distributional outcomes.
method Semiparametrically efficient finite-location test using kernel witnesses and orthogonal features.
result DR-ME reveals causal-discrepancy coordinates and has noncentral chi-square local power.

We study a continuous-time version of the intermediation model of Grossman and Miller (1988). To wit, we solve for the competitive equilibrium prices at which liquidity takers' demands are absorbed by dealers with quadratic inventory costs, who can in turn gradually transfer these positions to an exogenous open market …

2018-07-22abs ↗pdf ↗

This article constructs the moduli stack of torsionfree GG-jet-structures in homotopy type theory with one monadic modality. This yields a construction of this moduli stack for any \infty-topos equipped with any stable factorization systems. In the intended applications of this theory, the factorization systems are …

2018-06-15abs ↗pdf ↗

Given a closed simply connected manifold MM of dimension 2n62n\ge6, we compare the ring of characteristic classes of smooth oriented bundles with fibre MM to the analogous ring resulting from replacing MM by the connected sum MΣM\sharpΣ with an exotic sphere ΣΣ. We show that, after inverting the order of ΣΣ in the …

2018-02-07abs ↗pdf ↗

A new method uses Hermite polynomials to improve machine learning models.

problem Improving the accuracy of machine learning models using non-positive kernels.
method Using multi-variate Hermite polynomials and a permutation test to approximate measures and classify data.
result The witness function method can reliably identify in-class vs out-of-class regions.

The study shows that several properties are not profinite invariants.

problem Determining which properties are profinite invariants.
method Combining Rips constructions and iterated group-theoretic Dehn filling on hyperbolic virtually special groups.
result Several properties (stable commutator length, quasimorphisms, property NL, property FW_\infty, property FA, and non-abelian free subgroups) are not profinite invariants.

A framework for analyzing financial systems under scenario constraints.

problem Quantifying worst-case and best-case performance in financial systems.
method Quantitative automata-based framework integrating event history automata and weighted finance finite automata.
result Exact calculation of upper and lower payoff bounds with interpretable witness event histories.

In the recent years, we have witnessed the development of multi-label classification methods which utilize the structure of the label space in a divide and conquer approach to improve classification performance and allow large data sets to be classified efficiently. Yet most of the available data sets have been provide…

2017-04-27abs ↗pdf ↗

The ability to witness non-local correlations lies at the core of foundational aspects of quantum mechanics and its application in the processing of information. Commonly, this is achieved via the violation of Bell inequalities. Unfortunately, however, their systematic derivation quickly becomes unfeasible as the scena…

2018-08-21abs ↗pdf ↗

Gaussian processes (GPs) have been proven to be powerful tools in various areas of machine learning. However, there are very few applications of GPs in the scenario of multi-view learning. In this paper, we present a new GP model for multi-view learning. Unlike existing methods, it combines multiple views by regularizi…

2017-01-17abs ↗pdf ↗

Great successes of deep neural networks have been witnessed in various real applications. Many algorithmic and implementation techniques have been developed, however, theoretical understanding of many aspects of deep neural networks is far from clear. A particular interesting issue is the usefulness of dropout, which w…

2014-02-16abs ↗pdf ↗

OMLE combines optimism and MLE for efficient sequential decision making.

problem Efficiently solving sequential decision making problems, especially in partially observable settings.
method Combines optimism for exploration and maximum likelihood estimation for model learning.
result OMLE learns near-optimal policies for a wide range of sequential decision making problems.

Graph neural networks struggle with proving unsatisfiability in complex logical formulas.

problem Proving unsatisfiability in complex logical formulas.
method Investigating the limitations of graph neural networks in logical reasoning tasks.
result Graph neural networks may fail in certifying unsatisfiability in Boolean formulae.

XRAI improves saliency maps for deep neural networks.

problem Improving understanding of deep neural networks through better saliency methods.
method XRAI is a region-based attribution method built upon integrated gradients, with new evaluation methods and sanity checks.
result XRAI produces better results than other saliency methods for common models and the ImageNet dataset.

The study of networks has witnessed an explosive growth over the past decades with several ground-breaking methods introduced. A particularly interesting -- and prevalent in several fields of study -- problem is that of inferring a function defined over the nodes of a network. This work presents a versatile kernel-base…

2017-11-28abs ↗pdf ↗

Survey on quantum computing and neural networks.

problem Understanding and comparing quantum computing and neural networks.
method Introduction to quantum computing concepts, explanation of quantum computing paradigms, and analysis of quantum neural networks.
result Current state-of-the-art in quantum neural networks.

New proof shows equality in spacetime mass theorem.

problem Proving the equality case of spacetime positive mass theorem.
method Uses a new approach requiring only EPE \ge |P| for near initial data sets.
result Initial data sets with null ADM energy-momentum must embed into Minkowski space.

One of the most fundamental problems in causal inference is the estimation of a causal effect when variables are confounded. This is difficult in an observational study, because one has no direct evidence that all confounders have been adjusted for. We introduce a novel approach for estimating causal effects that explo…

2014-06-02abs ↗pdf ↗