Search Results for author: Xiangrong Zeng

Found 14 papers, 5 papers with code

Path-based knowledge reasoning with textual semantic information for medical knowledge graph completion

no code implementations27 May 2021 Yinyu Lan, Shizhu He, Xiangrong Zeng, Shengping Liu, Kang Liu, Jun Zhao

To address the above issues, this paper proposes two novel path-based reasoning methods to solve the sparsity issues of entity and path respectively, which adopts the textual semantic information of entities and paths for MedKGC.

Joint Entity and Relation Extraction with Set Prediction Networks

1 code implementation3 Nov 2020 Dianbo Sui, Yubo Chen, Kang Liu, Jun Zhao, Xiangrong Zeng, Shengping Liu

Compared with cross-entropy loss that highly penalizes small shifts in triple order, the proposed bipartite matching loss is invariant to any permutation of predictions; thus, it can provide the proposed networks with a more accurate training signal by ignoring triple order and focusing on relation types and entities.

Joint Entity and Relation Extraction Relation +1

Which is the Effective Way for Gaokao: Information Retrieval or Neural Networks?

1 code implementation EACL 2017 Shangmin Guo, Xiangrong Zeng, Shizhu He, Kang Liu, Jun Zhao

As one of the most important test of China, Gaokao is designed to be difficult enough to distinguish the excellent high school students.

Information Retrieval Multiple-choice +4

The Ordered Weighted $\ell_1$ Norm: Atomic Formulation, Projections, and Algorithms

3 code implementations15 Sep 2014 Xiangrong Zeng, Mário A. T. Figueiredo

The ordered weighted $\ell_1$ norm (OWL) was recently proposed, with two different motivations: its good statistical properties as a sparsity promoting regularizer; the fact that it generalizes the so-called {\it octagonal shrinkage and clustering algorithm for regression} (OSCAR), which has the ability to cluster/group regression variables that are highly correlated.

Clustering regression

Decreasing Weighted Sorted $\ell_1$ Regularization

no code implementations11 Apr 2014 Xiangrong Zeng, Mário A. T. Figueiredo

We consider a new family of regularizers, termed {\it weighted sorted $\ell_1$ norms} (WSL1), which generalizes the recently introduced {\it octagonal shrinkage and clustering algorithm for regression} (OSCAR) and also contains the $\ell_1$ and $\ell_{\infty}$ norms as particular instances.

Clustering regression

Robust Binary Fused Compressive Sensing using Adaptive Outlier Pursuit

no code implementations20 Feb 2014 Xiangrong Zeng, Mário A. T. Figueiredo

We propose a new method, {\it robust binary fused compressive sensing} (RoBFCS), to recover sparse piece-wise smooth signals from 1-bit compressive measurements.

Compressive Sensing

Exploiting Two-Dimensional Group Sparsity in 1-Bit Compressive Sensing

no code implementations20 Feb 2014 Xiangrong Zeng, Mário A. T. Figueiredo

The subgradient of the 2D one-sided $\ell_1$ (or $\ell_2$) penalty and the projection onto the $K$-sparsity and TV or MTV constraint can be computed efficiently, allowing the appliaction of algorithms of the {\it forward-backward splitting} (a. k. a.

Compressive Sensing Vocal Bursts Valence Prediction

Binary Fused Compressive Sensing: 1-Bit Compressive Sensing meets Group Sparsity

no code implementations20 Feb 2014 Xiangrong Zeng, Mário A. T. Figueiredo

We propose a new method, {\it binary fused compressive sensing} (BFCS), to recover sparse piece-wise smooth signals from 1-bit compressive measurements.

Compressive Sensing

Group-sparse Matrix Recovery

no code implementations20 Feb 2014 Xiangrong Zeng, Mário A. T. Figueiredo

We show that the proximity operator of 2OSCAR can be computed based on that of OSCAR.

Clustering regression

A novel sparsity and clustering regularization

no code implementations18 Oct 2013 Xiangrong Zeng, Mário A. T. Figueiredo

We propose a novel SPARsity and Clustering (SPARC) regularizer, which is a modified version of the previous octagonal shrinkage and clustering algorithm for regression (OSCAR), where, the proposed regularizer consists of a $K$-sparse constraint and a pair-wise $\ell_{\infty}$ norm restricted on the $K$ largest components in magnitude.

Clustering regression

Solving OSCAR regularization problems by proximal splitting algorithms

no code implementations24 Sep 2013 Xiangrong Zeng, Mário A. T. Figueiredo

The OSCAR regularizer has a non-trivial proximity operator, which limits its applicability.

Clustering

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