Dimensionality Reduction with Category Information Fusion and Non-negative Matrix Factorization for Text Categorization

2011 ◽  
pp. 505-512 ◽  
Author(s):  
Wenbin Zheng ◽  
Yuntao Qian ◽  
Hong Tang
Keyword(s):  
Dimensionality Reduction ◽  
Information Fusion ◽  
Matrix Factorization ◽  
Text Categorization ◽  
Category Information ◽  
Non Negative Matrix Factorization

scholarly journals Dimensionality reduction for single cell RNA sequencing data using constrained robust non-negative matrix factorization

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Shuqin Zhang ◽  
Liu Yang ◽  
Jinwen Yang ◽  
Zhixiang Lin ◽  
Michael K Ng
Keyword(s):  
Dimensionality Reduction ◽  
Single Cell ◽  
Rna Sequencing ◽  
Matrix Factorization ◽  
Sparse Matrix ◽  
Differential Expression Analysis ◽  
Data Matrix ◽  
Research Attention ◽  
Single Cell Rna Sequencing ◽  
Non Negative Matrix Factorization

Abstract Single cell RNA-sequencing (scRNA-seq) technology, a powerful tool for analyzing the entire transcriptome at single cell level, is receiving increasing research attention. The presence of dropouts is an important characteristic of scRNA-seq data that may affect the performance of downstream analyses, such as dimensionality reduction and clustering. Cells sequenced to lower depths tend to have more dropouts than those sequenced to greater depths. In this study, we aimed to develop a dimensionality reduction method to address both dropouts and the non-negativity constraints in scRNA-seq data. The developed method simultaneously performs dimensionality reduction and dropout imputation under the non-negative matrix factorization (NMF) framework. The dropouts were modeled as a non-negative sparse matrix. Summation of the observed data matrix and dropout matrix was approximated by NMF. To ensure the sparsity pattern was maintained, a weighted ℓ1 penalty that took into account the dependency of dropouts on the sequencing depth in each cell was imposed. An efficient algorithm was developed to solve the proposed optimization problem. Experiments using both synthetic data and real data showed that dimensionality reduction via the proposed method afforded more robust clustering results compared with those obtained from the existing methods, and that dropout imputation improved the differential expression analysis.

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