Closed-form Supervised Dimensionality Reduction with Generalized Linear Models
author:
Irina Rish,
IBM T J Watson Research Center
Description
We propose a family of supervised dimensionality reduction (SDR) algorithms that combine feature extraction (dimensionality reduction) with learning a predictive model in a unified optimization framework, using data- and class-appropriate generalized linear models (GLMs), and handling both classification and regression problems. Our approach uses simple closed-form update rules and is provably convergent. Promising empirical results are demonstrated on a variety of high-dimensional datasets.
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| Slides | |
| 0:00 | Closed-Form Supervised Dimensionality Reduction with Generalized Linear Models |
| 0:20 | Outline |
| 1:29 | Motivating Application: Brain Imaging (Functional MRI) |
| 3:13 | Other High-Dimensional Applications |
| 4:06 | Why Dimensionality Reduction? |
| 5:10 | Why SUPERVISED Dimensionality Reduction (SDR)? |
| 6:06 | SDR: A General Framework |
| 7:39 | Related Work : Particular X → U and U → Y |
| 9:24 | Our Contributions |
| 10:38 | SDR Model: Exponential-Family Distributions with Low-Dimensional Natural Parameters |
| 11:42 | Another View: GLMs with Shared "Hidden Data" |
| 12:44 | SDR: Optimization Problem |
| 13:54 | SDR: Alternate Minimization Algorithm |
| 14:50 | Optimization via Auxiliary Functions |
| 15:37 | Auxiliary Functions for SDR-GLM |
| 16:36 | Key Idea: Combining Auxiliary Functions |
| 17:39 | Derivation of Closed-Form Update Rules |
| 18:56 | Empirical Evaluation on Simulated Data |
| 19:23 | Bernoulli Noise |
| 20:46 | Gaussian Noise |
| 21:25 | Regularization Parameter (Weight on Data Reconstruction Loss) |
| 22:05 | Real-life Data: Sensor Network Connectivity |
| 22:47 | Real-life Data: Mental state prediction from fMRI |
| 23:22 | Real-life Data: PBAIC 2007 fMRI Dataset |
| 24:51 | - Questions |
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