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---
layout: default
---
<div>
These notes accompany the Stanford CS class <a href="http://cs231n.stanford.edu/">CS231n: Convolutional Neural Networks for Visual Recognition</a>.
<br>
For questions/concerns/bug reports contact <a href="http://cs.stanford.edu/people/jcjohns/">Justin Johnson</a> regarding the assignments, or contact <a href="http://cs.stanford.edu/people/karpathy/">Andrej Karpathy</a> regarding the course notes. You can also submit a pull request directly to our <a href="https://github.com/cs231n/cs231n.github.io">git repo</a>.
<br>
We encourage the use of the <a href="https://hypothes.is/">hypothes.is</a> extension to annote comments and discuss these notes inline.
</div>
<div class="home">
<div class="materials-wrap">
<div class="module-header">Spring 2019 Assignments</div>
<div class="materials-item">
<a href="assignments2019/assignment1/">
Assignment #1: Image Classification, kNN, SVM, Softmax, Neural Network
</a>
</div>
<div class="materials-item">
<a href="assignments2019/assignment2/">
Assignment #2: Fully-Connected Nets, Batch Normalization, Dropout,
Convolutional Nets
</a>
</div>
<div class="materials-item">
<a href="assignments2019/assignment3/">
Assignment #3: Image Captioning with Vanilla RNNs, Image Captioning
with LSTMs, Network Visualization, Style Transfer, Generative Adversarial Networks
</a>
</div>
<!--
<div class="module-header">Spring 2018 Assignments</div>
<div class="materials-item">
<a href="assignments2018/assignment1/">
Assignment #1: Image Classification, kNN, SVM, Softmax, Neural Network
</a>
</div>
<div class="materials-item">
<a href="assignments2018/assignment2/">
Assignment #2: Fully-Connected Nets, Batch Normalization, Dropout,
Convolutional Nets
</a>
</div>
<div class="materials-item">
<a href="assignments2018/assignment3/">
Assignment #3: Image Captioning with Vanilla RNNs, Image Captioning
with LSTMs, Network Visualization, Style Transfer, Generative Adversarial Networks
</a>
</div>
-->
<!--
<div class="module-header">Winter 2016 Assignments</div>
<div class="materials-item">
<a href="assignments2016/assignment1/">
Assignment #1: Image Classification, kNN, SVM, Softmax, Neural Network
</a>
</div>
<div class="materials-item">
<a href="assignments2016/assignment2/">
Assignment #2: Fully-Connected Nets, Batch Normalization, Dropout,
Convolutional Nets
</a>
</div>
<div class="materials-item">
<a href="assignments2016/assignment3/">
Assignment #3: Recurrent Neural Networks, Image Captioning,
Image Gradients, DeepDream
</a>
</div>
-->
<!--
<div class="module-header">Winter 2015 Assignments</div>
<div class="materials-item">
<a href="assignment1/">
Assignment #1: Image Classification, kNN, SVM, Softmax
</a>
</div>
<div class="materials-item">
<a href="assignment2/">
Assignment #2: Neural Networks, ConvNets I
</a>
</div>
<div class="materials-item">
<a href="assignment3/">
Assignment #3: ConvNets II, Transfer Learning, Visualization
</a>
</div>
-->
<div class="module-header">Module 0: Preparation</div>
<div class="materials-item">
<a href="setup-instructions/">
Setup Instructions
</a>
</div>
<div class="materials-item">
<a href="python-numpy-tutorial/">
Python / Numpy Tutorial
</a>
</div>
<div class="materials-item">
<a href="ipython-tutorial/">
IPython Notebook Tutorial
</a>
</div>
<!--
<div class="materials-item">
<a href="terminal-tutorial/">
Terminal.com Tutorial
</a>
</div>
-->
<div class="materials-item">
<a href="https://github.com/cs231n/gcloud">
Google Cloud Tutorial
</a>
</div>
<div class="materials-item">
<a href="aws-tutorial/">
AWS Tutorial
</a>
</div>
<!-- hardcoding items here to force a specific order -->
<div class="module-header">Module 1: Neural Networks</div>
<div class="materials-item">
<a href="classification/">
Image Classification: Data-driven Approach, k-Nearest Neighbor, train/val/test splits
</a>
<div class="kw">
L1/L2 distances, hyperparameter search, cross-validation
</div>
</div>
<div class="materials-item">
<a href="linear-classify/">
Linear classification: Support Vector Machine, Softmax
</a>
<div class="kw">
parameteric approach, bias trick, hinge loss, cross-entropy loss, L2 regularization, web demo
</div>
</div>
<div class="materials-item">
<a href="optimization-1/">
Optimization: Stochastic Gradient Descent
</a>
<div class="kw">
optimization landscapes, local search, learning rate, analytic/numerical gradient
</div>
</div>
<div class="materials-item">
<a href="optimization-2/">
Backpropagation, Intuitions
</a>
<div class="kw">
chain rule interpretation, real-valued circuits, patterns in gradient flow
</div>
</div>
<div class="materials-item">
<a href="neural-networks-1/">
Neural Networks Part 1: Setting up the Architecture
</a>
<div class="kw">
model of a biological neuron, activation functions, neural net architecture, representational power
</div>
</div>
<div class="materials-item">
<a href="neural-networks-2/">
Neural Networks Part 2: Setting up the Data and the Loss
</a>
<div class="kw">
preprocessing, weight initialization, batch normalization, regularization (L2/dropout), loss functions
</div>
</div>
<div class="materials-item">
<a href="neural-networks-3/">
Neural Networks Part 3: Learning and Evaluation
</a>
<div class="kw">
gradient checks, sanity checks, babysitting the learning process, momentum (+nesterov), second-order methods, Adagrad/RMSprop, hyperparameter optimization, model ensembles
</div>
</div>
<div class="materials-item">
<a href="neural-networks-case-study/">
Putting it together: Minimal Neural Network Case Study
</a>
<div class="kw">
minimal 2D toy data example
</div>
</div>
<div class="module-header">Module 2: Convolutional Neural Networks</div>
<div class="materials-item">
<a href="convolutional-networks/">
Convolutional Neural Networks: Architectures, Convolution / Pooling Layers
</a>
<div class="kw">
layers, spatial arrangement, layer patterns, layer sizing patterns, AlexNet/ZFNet/VGGNet case studies, computational considerations
</div>
</div>
<div class="materials-item">
<a href="understanding-cnn/">
Understanding and Visualizing Convolutional Neural Networks
</a>
<div class="kw">
tSNE embeddings, deconvnets, data gradients, fooling ConvNets, human comparisons
</div>
</div>
<div class="materials-item">
<a href="transfer-learning/">
Transfer Learning and Fine-tuning Convolutional Neural Networks
</a>
</div>
</div>
</div>