Search Results for author: Hongjian Wang

Found 12 papers, 1 papers with code

Positive Semidefinite Supermartingales and Randomized Matrix Concentration Inequalities

no code implementations28 Jan 2024 Hongjian Wang, Aaditya Ramdas

We present new concentration inequalities for either martingale dependent or exchangeable random symmetric matrices under a variety of tail conditions, encompassing now-standard Chernoff bounds to self-normalized heavy-tailed settings.

valid

Time-Uniform Confidence Spheres for Means of Random Vectors

no code implementations14 Nov 2023 Ben Chugg, Hongjian Wang, Aaditya Ramdas

We derive and study time-uniform confidence spheres -- confidence sphere sequences (CSSs) -- which contain the mean of random vectors with high probability simultaneously across all sample sizes.

valid

Anytime-valid t-tests and confidence sequences for Gaussian means with unknown variance

no code implementations5 Oct 2023 Hongjian Wang, Aaditya Ramdas

These are respectively obtained by swapping Lai's flat mixture for a Gaussian mixture, and swapping the right Haar mixture over $\sigma$ with the maximum likelihood estimate under the null, as done in universal inference.

valid

Dynamic Visual Prompt Tuning for Parameter Efficient Transfer Learning

no code implementations12 Sep 2023 Chunqing Ruan, Hongjian Wang

Parameter efficient transfer learning (PETL) is an emerging research spot that aims to adapt large-scale pre-trained models to downstream tasks.

Transfer Learning Visual Prompt Tuning

The extended Ville's inequality for nonintegrable nonnegative supermartingales

no code implementations3 Apr 2023 Hongjian Wang, Aaditya Ramdas

Following the initial work by Robbins, we rigorously present an extended theory of nonnegative supermartingales, requiring neither integrability nor finiteness.

Huber-Robust Confidence Sequences

no code implementations23 Jan 2023 Hongjian Wang, Aaditya Ramdas

Confidence sequences are confidence intervals that can be sequentially tracked, and are valid at arbitrary data-dependent stopping times.

valid

Convergence Rates of Stochastic Gradient Descent under Infinite Noise Variance

no code implementations NeurIPS 2021 Hongjian Wang, Mert Gürbüzbalaban, Lingjiong Zhu, Umut Şimşekli, Murat A. Erdogdu

In this paper, we provide convergence guarantees for SGD under a state-dependent and heavy-tailed noise with a potentially infinite variance, for a class of strongly convex objectives.

Automatic Historical Feature Generation through Tree-based Method in Ads Prediction

no code implementations31 Dec 2020 Hongjian Wang, Qi Li, Lanbo Zhang, Yue Lu, Steven Yoo, Srinivas Vadrevu, Zhenhui Li

Historical features are important in ads click-through rate (CTR) prediction, because they account for past engagements between users and ads.

Click-Through Rate Prediction

Targeted Source Detection for Environmental Data

no code implementations29 Aug 2019 Guanjie Zheng, Mengqi Liu, Tao Wen, Hongjian Wang, Huaxiu Yao, Susan L. Brantley, Zhenhui Li

In the face of growing needs for water and energy, a fundamental understanding of the environmental impacts of human activities becomes critical for managing water and energy resources, remedying water pollution, and making regulatory policy wisely.

A Simple Baseline for Travel Time Estimation using Large-Scale Trip Data

no code implementations28 Dec 2015 Hongjian Wang, Zhenhui Li, Yu-Hsuan Kuo, Dan Kifer

The increased availability of large-scale trajectory data around the world provides rich information for the study of urban dynamics.

Travel Time Estimation

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