# UFLDL Tutorial

### From Ufldl

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## Revision as of 01:28, 20 October 2011

**Description:** This tutorial will teach you the main ideas of Unsupervised Feature Learning and Deep Learning. By working through it, you will also get to implement several feature learning/deep learning algorithms, get to see them work for yourself, and learn how to apply/adapt these ideas to new problems.

This tutorial assumes a basic knowledge of machine learning (specifically, familiarity with the ideas of supervised learning, logistic regression, gradient descent). If you are not familiar with these ideas, we suggest you go to this Machine Learning course and complete sections II, III, IV (up to Logistic Regression) first.

**Sparse Autoencoder**

- Neural Networks
- Backpropagation Algorithm
- Gradient checking and advanced optimization
- Autoencoders and Sparsity
- Visualizing a Trained Autoencoder
- Sparse Autoencoder Notation Summary
- Exercise:Sparse Autoencoder

**Vectorized implementation**

- Vectorization
- Logistic Regression Vectorization Example
- Neural Network Vectorization
- Exercise:Vectorization

**Preprocessing: PCA and Whitening**

**Softmax Regression**

**Self-Taught Learning and Unsupervised Feature Learning**

**Building Deep Networks for Classification**

- From Self-Taught Learning to Deep Networks
- Deep Networks: Overview
- Stacked Autoencoders
- Fine-tuning Stacked AEs
- Exercise: Implement deep networks for digit classification

**Linear Decoders with Autoencoders**

**Working with Large Images**

**Note**: The sections above this line are stable. The sections below are still under construction, and may change without notice. Feel free to browse around however, and feedback/suggestions are welcome.

**Miscellaneous**

**Miscellaneous Topics**

**Advanced Topics**:

**Sparse Coding**

**ICA Style Models**

**Others**

- Convolutional training
- Restricted Boltzmann Machines
- Deep Belief Networks
- Denoising Autoencoders
- K-means
- Spatial pyramids / Multiscale
- Slow Feature Analysis
- Tiled Convolution Networks

Material contributed by: Andrew Ng, Jiquan Ngiam, Chuan Yu Foo, Yifan Mai, Caroline Suen