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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.

169,341 papers · 148 categories

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23466891 · Jun 202019922001200920182026
48 results for garment fitting

A new model for simulating cloth manipulation in robots, accurate to within 1cm.

problem Accurately simulating cloth manipulation in robots, especially in moderate stress environments.
method A continuous, isometric strain model for textiles, treating them as inextensible surfaces with only isometric motions. Aerodynamic effects are incorporated through virtual uncoupling of mass.
result Simulations are accurate to within 1cm compared to real-world manipulation, even with coarse meshes.

Method retrieves similar fashion items from images and text, enabling style refinement.

problem Lack of intuitive, interactive refinement in search engines for fashion items.
method Joint visual-textual embedding training, Mini-Batch Match Retrieval, attribute extraction.
result Improved performance in multimodal style search, demonstrated through benchmark.

A new metric uses nonparametric comparison for fitting parametric distributions.

problem Measuring goodness-of-fit for nonlinear models using maximum likelihood estimation.
method Survival Jensen-Shannon divergence (SJSSJS) and its empirical counterpart (ESJS{\cal E}SJS) for nonparametric comparison.
result The ESJS{\cal E}SJS can be used as a measure of goodness-of-fit in maximum likelihood estimation.

Derives formulas for swaption prices in HJM model and uses nonparametric fit to identify arbitrage opportunities.

problem Deriving swaption prices in the HJM model and identifying arbitrage opportunities.
method Derives closed form formulas for swaption prices in HJM model and uses nonparametric fit of deterministic forward volatility.
result Demonstrates that the derived formulas and nonparametric fit work well and can identify arbitrage opportunities.

Unified model for irregular time series with flexible representations.

problem Missing values, irregularly collected samples, and multi-resolution signals in multivariate time series data.
method Multi-resolution Flexible Irregular Time series Network (Multi-FIT) using FIT networks and FIT-V.
result Improves predictive tasks, including forecasting patient survival.

We study a resource utilization scenario characterized by intrinsic fitness. To describe the growth and organization of different cities, we consider a model for resource utilization where many restaurants compete, as in a game, to attract customers using an iterative learning process. Results for the case of restauran…

2014-03-07abs ↗pdf ↗

Modeling resource accumulation in a population game to explain wealth distribution.

problem Explaining the distribution of wealth in a population game.
method Modeling resource accumulation as a population game with Hawk-Dove interactions, analyzing fitness/wealth distribution and evolution over time.
result Long-run average fitness/wealth is non-monotonic with resource value, explaining the 'curse of riches'.

Kernel Multigrid accelerates Back-fitting for additive Gaussian Processes.

problem Slow convergence of Back-fitting in training additive Gaussian Processes.
method Kernel Packets (KP) and Sparse Gaussian Process Regression (GPR) to enhance Back-fitting.
result Kernel Multigrid reduces the required iterations to O(logn)\mathcal{O}(\log n).

A framework for eliciting utility functions from investor preferences.

problem Hard elicitation of specific utility functions in portfolio selection.
method Preference-fitting method using probability-wealth pairs and PHARA approximation.
result Fitted utility function converges to the optimal one as more data is used.

Machine learning speeds up the construction of virus assembly fitness landscapes.

problem Constructing realistic evolutionary fitness landscapes for viruses is computationally expensive.
method Developed a neural network to model virus assembly efficiency from a whole genome/phenotype space.
result Machine learning significantly reduces the computational time for constructing fitness landscapes.

This paper illustrates a procedure for fitting financial data with αα-stable distributions. After using all the available methods to evaluate the distribution parameters, one can qualitatively select the best estimate and run some goodness-of-fit tests on this estimate, in order to quantitatively assess its quality. I…

2006-08-23abs ↗pdf ↗

Study shows how varying levels of supervision and orthonormality constraints affect generalization errors in subspace fitting.

problem Effects of varying levels of supervision and orthonormality constraints on generalization errors in subspace fitting.
method Flexible family of problems connecting unsupervised and supervised subspace fitting tasks, explored over a supervision-orthonormality plane.
result Generalization errors of subspace fitting problems follow double descent trends as they become more supervised and less orthonormally constrained.

Study evaluates different mathematical models for three case studies using statistical fitting.

problem Estimating outcomes in population dynamics, temperature variations, and market equilibrium.
method Applied various statistical equations (e.g., fractional exponential, sinusoidal) to three case studies.
result Optimal models differ by case study (fractional exponential for population dynamics, sinusoidal for temperature and market equilibrium).

In quantitative finance, we often fit a parametric semimartingale model to asset prices. To ensure our model is correct, we must then perform goodness-of-fit tests. In this paper, we give a new goodness-of-fit test for volatility-like processes, which is easily applied to a variety of semimartingale models. In each cas…

2015-05-30abs ↗pdf ↗

New method extends fitted Q-evaluation for distributional off-policy reinforcement learning.

problem Estimating return distribution in reinforcement learning using offline data.
method Developed a set of guiding principles and new FDE methods with theoretical justification.
result FDE methods outperform existing approaches in simulations and real-world games.

A new method to improve image restoration by re-fitting standard methods.

problem Systematic errors in popular restoration algorithms for image processing.
method Developing a re-fitting approach that preserves covariant information and Jacobian of original estimators.
result Improved image restoration results on numerical simulations.

Fitting models for non-Poisson point processes is complicated by the lack of tractable models for much of the data. By using large samples of independent and identically distributed realizations and statistical learning, it is possible to identify absence of fit through finding a classification rule that can efficientl…

2007-12-02abs ↗pdf ↗

A new kernel Stein test assesses fit for variable-length sequential data.

problem Evaluating goodness of fit for varying-dimensional data like text documents of different lengths.
method Extends kernel Stein discrepancy (KSD) to variable-dimension settings by identifying appropriate Stein operators and proposing a novel KSD goodness-of-fit test.
result The proposed test performs well on discrete sequential data benchmarks.

New findings show a balance between data fit and complexity in kernel hyperparameters.

problem Overcorrelation due to reparametrization of kernel hyperparameters.
method Reparametrization of kernel hyperparameters and analysis of marginal likelihood.
result Data fit term influences all other kernel hyperparameters, not just the complexity penalty.

FIT is a fast nonparametric test for conditional independence.

problem Testing conditional independence for high-dimensional data.
method Based on the conditional independence principle, FIT assesses whether additional variables improve predictions.
result FIT is significantly faster and more accurate than existing methods for large datasets.

A test assesses how well data fits a target density function.

problem Measuring how well data fits a target density function without assuming a specific form.
method Stein's method using Reproducing Kernel Hilbert Space functions to construct a divergence measure, estimated via V-statistic.
result The proposed test accurately assesses goodness of fit for various data types and contexts.

Hawkes processes show weak causality; likelihoods are nearly equal for forward and backward event times.

problem Testing the causality of Hawkes processes with time reversal.
method Maximum likelihood estimation and goodness-of-fit tests.
result Parameter estimation of Hawkes processes is weakly dependent on the direction of time, and significant fits may favor backward time.

Neural networks fit fewer samples than their parameters suggest in practice.

problem Understanding the practical limitations of neural network flexibility.
method Examination of neural network optimization, parameter efficiency, and loss surfaces.
result Neural networks can only fit training sets with significantly fewer samples than their parameters suggest.