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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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1223 · Feb 202019922001200920182026
46 results for impediments

Paper tackles overestimation bias in continuous control, improving performance by 25%.

problem Overestimation bias in off-policy learning.
method Truncated Quantile Critics (TQC) combines distributional representation, truncation, and ensembling of critics.
result TQC outperforms state-of-the-art methods by 25% on the Humanoid environment.

The correspondence of stationary, axisymmetric, asymptotically flat space-times and bundles over a reduced twistor space has been established in four dimensions. The main impediment for an application of this correspondence to examples in higher dimensions is the lack of a higher-dimensional equivalent of the Ernst pot…

2012-06-30abs ↗pdf ↗

FlexServe simplifies deployment of PyTorch models as REST endpoints.

problem Lack of control over model evolution and strict security requirements in operational environments.
method Developed FlexServe, a library to deploy multi-model ensembles with flexible batching.
result Rapid deployment of PyTorch models without intermediate transformations.

Develops a method to define admissible rewards for robust policy evaluation in RL.

problem Defining a reward function for robust off-policy evaluation in RL with limited data.
method Identifies an admissible set of reward functions ensuring policies are close to past behavior and can be evaluated with high confidence.
result Demonstrates the approach on synthetic and real-world domains, including a critical care application.

New method circumvents non-convexity in bilevel RL via hyper-gradient.

problem Non-convexity in lower-level RL problems in bilevel reinforcement learning.
method Characterizing hyper-gradient via fully first-order information, circumventing convexity assumption.
result Developed model-based and model-free algorithms with convergence rate O(ε1)O(ε^{-1}).

Infinite-horizon Gaussian processes reduce computational complexity for long datasets.

problem Cubic computational cost in state dimensionality for Gaussian processes.
method Single-sweep EP inference scheme for GPs with general likelihoods, reducing cost to O(m^2) per data point.
result Reduced computational complexity from cubic to quadratic in state dimensionality.

The paper revisits classical competition theory to explain speculative asset price dynamics.

problem Understanding the dynamics of speculative asset prices and their volatility.
method Specialized classical model of competition with reservation prices, incorporating speculation.
result The model explains excess, fat-tailed, and clustered volatility in speculative asset prices.

Paper develops a new similarity metric for predicting stock market returns.

problem Predicting stock returns is challenging due to market stochasticity and various influencing factors.
method Case-based reasoning approach using historical pricing data and a novel similarity metric.
result Demonstrates the benefits of the novel similarity metric in predicting stock market returns.

NeuroFabric proposes a method to optimize sparse network training topologies.

problem Long training times in deep neural networks due to high memory and compute requirements.
method Developed a new sparse neural network initialization scheme and evaluated various topologies.
result Identified a single optimal topology that maximizes accuracy across different datasets.

Polynomial time algorithm for learning mixtures of Mallows models with any number of components.

problem Learning parameters of mixtures of Mallows models with any constant number of components.
method Determinantal identity of Zagier, polynomial identifiability, test functions, information-theoretic lower bounds, local queries, beyond worst-case analysis.
result First polynomial time algorithm for provably learning mixtures of Mallows models with any constant number of components.

Improved ICU mortality prediction with interpretable deep learning.

problem Sub-optimal performance of traditional mortality prediction scores.
method Deep multi-scale convolutional architecture trained on MIMIC-III, coalitional game theory for visual explanations.
result State-of-the-art performance with interpretability.

The study examines machine learning classification algorithms and their generalizability using Framingham Heart Study data.

problem Addressing biases and generalizability issues in machine learning classification algorithms.
method Comparison of eight machine learning classification algorithms on Framingham Heart Study data.
result Double discriminant scoring of type I is the most generalizable algorithm.

ReNA fast clusters features for structured signals, reducing analysis time and noise.

problem Efficiently summarize structured signals to reduce analysis time and noise.
method Recursive Nearest Agglomeration (ReNA) for linear-time feature clustering.
result ReNA approximates data as well as traditional methods but with linear time complexity.

CARP speeds up convex clustering by 100x and offers better visualization.

problem Computational intensity and lack of compelling visualizations in convex clustering.
method Algorithmic Regularization for iterative approximation of regularization paths.
result CARP delivers over 100-fold speed-up and finer approximation grid.

Picket guards against corrupted data in machine learning models.

problem Data corruption biases models and invalidates predictions.
method PicketNet detects corrupted data using self-supervised deep learning; flags corrupted queries online.
result Picket consistently protects models from corrupted data during training and deployment.

Enhances Deep Hedging with K-FAC for financial data.

problem High computational burden in training neural networks for financial applications.
method Integrates Kronecker-Factored Approximate Curvature (K-FAC) optimization with LSTM networks.
result Significant improvements in convergence and hedging efficacy, reducing transaction costs and P&L variance.

New method removes interference bias in causal models.

problem Interference bias impedes causal effect identification in real-world settings.
method Novel definition of causal models with local interference, semi-parametric assumptions.
result True Average Causal Effect can be identified in certain semi-parametric models with local interference.

Paper proposes a new method for uncertainty estimation in medical data.

problem Difficulty in assigning confidence to deep learning model predictions in healthcare.
method Combines deep Bayesian learning with deep kernel learning for uncertainty estimation.
result Demonstrates improved uncertainty estimation compared to Gaussian processes and deep Bayesian neural networks.

Efficiently infers graph edges from genetic similarity data in landscape genetics.

problem Inferring unknown graph edges from genetic similarity data in a heterogeneous landscape.
method Developed an efficient first-order optimization method to solve the inverse landscape genetics problem.
result Our method provides fast and reliable convergence, significantly outperforming existing heuristics.

High-dimensional neural network manifolds misalign with human perception, causing adversarial examples.

problem Adversarial attacks fool neural networks, but their origin is unclear.
method Defined and analyzed a network's perceptual manifold (PM) for a class concept.
result Neural network PMs have orders of magnitude higher dimensions than natural human concepts, suggesting exponential misalignment.

Continued reliance on human operators for managing data centers is a major impediment for them from ever reaching extreme dimensions. Large computer systems in general, and data centers in particular, will ultimately be managed using predictive computational and executable models obtained through data-science tools, an…

2015-05-19abs ↗pdf ↗

Develops a method to efficiently learn causal DAGs using directed clique trees.

problem Efficiently learning causal DAGs in the presence of large cliques.
method Decomposes DAGs into independently orientable components using directed clique trees and designs a two-phase intervention algorithm.
result Proves that the number of single-node interventions necessary to orient any DAG in an EC is at least the sum of half the size of the largest cliques in each chain component of the essential graph.

TrialGraph uses graph machine learning to improve clinical trial design and predict side effects.

problem Complexity and cost in clinical trials hinder drug development.
method Curated clinical trial data set converted to graph-structured formats, applied graph machine learning algorithms.
result MetaPath2Vec algorithm performed exceptionally well, improving prediction accuracy.

A new machine learning model forecasts COVID-19 incidence at county level in the USA.

problem Inaccurate disease spread forecasting due to spatiotemporal homogeneity assumptions.
method Spatiotemporal machine learning using LSTM architecture with spatial and temporal features.
result COVID-LSTM outperforms COVID-19 Forecast Hub's Ensemble model in accuracy.

This paper optimizes how many samples are needed to estimate a population's binary responses.

problem Estimating a distribution from incomplete or corrupted samples.
method The approach involves computing the empirical mean of a certain function, pre-solving a linear program, and using complex-analytic methods.
result Optimal sample complexity for population recovery is determined, showing phase transitions and sensitivity to dimension.

The abstract covers various aspects of eBusiness and eGovernment, including digital currencies, m-government services, gender inclusivity, eLearning, export performance, SME digitalization, and banking customer behavior.

problem Various challenges and opportunities in eBusiness and eGovernment.
method Critical review, UTAUT model with perceived risk theory, GAD approach, inductive research paradigm, one-on-one interviews, survey questionnaires, convenience sampling.
result Impediments to eLearning uptake, gender inclusivity in e-procurement, export performance of manufacturing firms, SME digitalization impact, measuring and modeling framework for Internet banking customers.