Search Results for author: Tianxi Li

Found 14 papers, 3 papers with code

Fitting Low-rank Models on Egocentrically Sampled Partial Networks

no code implementations9 Mar 2023 Angus Chan, Tianxi Li

This method is based on graph spectral properties and is computationally efficient for large-scale networks.

Link Prediction

The non-overlapping statistical approximation to overlapping group lasso

no code implementations16 Nov 2022 Mingyu Qi, Tianxi Li

Thanks to the separability, the computation of regularization based on our penalty is substantially faster than that of the overlapping group lasso, especially for large-scale and high-dimensional problems.

Incrementality Bidding via Reinforcement Learning under Mixed and Delayed Rewards

no code implementations2 Jun 2022 Ashwinkumar Badanidiyuru, Zhe Feng, Tianxi Li, Haifeng Xu

Incrementality, which is used to measure the causal effect of showing an ad to a potential customer (e. g. a user in an internet platform) versus not, is a central object for advertisers in online advertising platforms.

reinforcement-learning Reinforcement Learning (RL)

Diffusion Source Identification on Networks with Statistical Confidence

1 code implementation9 Jun 2021 Quinlan Dawkins, Tianxi Li, Haifeng Xu

Diffusion source identification on networks is a problem of fundamental importance in a broad class of applications, including rumor controlling and virus identification.

Network Estimation by Mixing: Adaptivity and More

no code implementations5 Jun 2021 Tianxi Li, Can M. Le

While many methods have been proposed to address this problem in recent years, they usually assume that the true model belongs to a known class, which is not verifiable in most real-world applications.

Link Prediction Model Selection

Informative core identification in complex networks

1 code implementation16 Jan 2021 Ruizhong Miao, Tianxi Li

In network analysis, the core structure of modeling interest is usually hidden in a larger network in which most structures are not informative.

Community Detection

Community models for networks observed through edge nominations

no code implementations9 Aug 2020 Tianxi Li, Elizaveta Levina, Ji Zhu

We propose a general model for a class of network sampling mechanisms based on recording edges via querying nodes, designed to improve community detection for network data collected in this fashion.

Clustering Community Detection +1

Linear regression and its inference on noisy network-linked data

no code implementations1 Jul 2020 Can M. Le, Tianxi Li

Linear regression on network-linked observations has been an essential tool in modeling the relationship between response and covariates with additional network structures.

Methodology

High-dimensional Gaussian graphical model for network-linked data

1 code implementation4 Jul 2019 Tianxi Li, Cheng Qian, Elizaveta Levina, Ji Zhu

Graphical models are commonly used to represent conditional dependence relationships between variables.

Vocal Bursts Intensity Prediction

Hierarchical community detection by recursive partitioning

no code implementations2 Oct 2018 Tianxi Li, Lihua Lei, Sharmodeep Bhattacharyya, Koen Van den Berge, Purnamrita Sarkar, Peter J. Bickel, Elizaveta Levina

This can be done with a simple top-down recursive partitioning algorithm, starting with a single community and separating the nodes into two communities by spectral clustering repeatedly, until a stopping rule suggests there are no further communities.

Clustering Community Detection +1

Probabilistic Rule Realization and Selection

no code implementations NeurIPS 2017 Haizi Yu, Tianxi Li, Lav R. Varshney

Abstraction and realization are bilateral processes that are key in deriving intelligence and creativity.

Network cross-validation by edge sampling

no code implementations14 Dec 2016 Tianxi Li, Elizaveta Levina, Ji Zhu

While many statistical models and methods are now available for network analysis, resampling network data remains a challenging problem.

Model Selection

A note on the statistical view of matrix completion

no code implementations10 May 2016 Tianxi Li

A very simple interpretation of matrix completion problem is introduced based on statistical models.

Matrix Completion valid

High-dimensional Mixed Graphical Models

no code implementations9 Apr 2013 Jie Cheng, Tianxi Li, Elizaveta Levina, Ji Zhu

While graphical models for continuous data (Gaussian graphical models) and discrete data (Ising models) have been extensively studied, there is little work on graphical models linking both continuous and discrete variables (mixed data), which are common in many scientific applications.

Computational Efficiency Vocal Bursts Intensity Prediction

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