Christopher C. Johnson

PhD Student in Computer Science, The University of Texas at Austin

Contact:

1 University Station C0500

Austin, TX 78712-0233

Email:

Research:

My research interests span the areas of Statistical Machine Learning, Recommender Systems, and Graphical Models. I am particularly interested in problems involving sparse parameter estimation in a high dimensional setting, such as graphical model structure learning, as well as problems involving sparse representations of big data, such as low rank matrix factorization. Finally, I am interested in applying Graphical Models to internet scale problems involving massive data sets for social network analysis, user modeling, and personalization. My advisor is Pradeep Ravikumar.

I am also a member of the UT Algorithms and Computational Theory Group and UT Artificial Intelligence Lab.

Projects / Publications:

"High-Dimensional Sparse Inverse Covariance Estimation using Greedy Methods" [pdf] [slides] [poster]

Christopher C. Johnson, Ali Jalali, Pradeep Ravikumar - AISTATS 2012 (Oral Presentation)

"On Learning Discrete Graphical Models Using Greedy Methods" [pdf]

Ali Jalali, Christopher C. Johnson, Pradeep Ravikumar - NIPS 2011 (Spotlight)

"Greedy Structure Learning of Markov Random Fields" (Masters Thesis) [pdf]

Christopher C. Johnson (committee: Pradeep Ravikumar, Inderjit Dhillon) - 2011

"Parallel Collaborative Filtering for Streaming Data" [pdf] [code]

Christopher C. Johnson, Alex Tang, Muqeet Ali - 2011

"On Classifying the Political Sentiment of Tweets" [pdf] [code]

Christopher C. Johnson, Shilpa Shukla, Parul Shukla - 2011

"Parallel Fault Tolerant Multi Agent Reinforcement Learning" [pdf]

Christopher C. Johnson - 2011

"A Named Entity Recognizer for Semi-Structured Data" [slides]

Christopher C. Johnson, Michael Yee (MIT) - 2010

Education:

PhD in Computer Science, The University of Texas at Austin: 2010 - present

MS in Computer Science, The University of Texas at Austin: 2010 - 2011

BS in Computer Science, The University of Texas at Austin: 2002 - 2006

TA Information:

Spring 2012: SSC 321 - Introduction to Probability and Statistics

Discussion Section: Thursdays 3-4pm WCH 2.112, 4-5pm JES A203A

Personal:

Resume:

[pdf]