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README.md
conda-requirements.txt
package.json
requirements.txt
run.py
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README.md

Handwritten Digits Recognition

Imgur

A flask app that classifies handwritten digits using neural network and backpropagation algorithm.

The neural network consists of an input layer, a hidden layer and an output layer. Current implementation classifies the MNIST test dataset with 90 ~ 95 % accuracy after trained for about 20 minites with the MNIST training dataset.

The app accepts user input via html canvas, downsize it to 28 x 28 and classifies it using the above neural network with the precalculated parameters.

Setup

Download MNIST dataset from http://yann.lecun.com/exdb/mnist/:

mkdir web/resources/mnist
curl http://yann.lecun.com/exdb/mnist/t10k-images-idx3-ubyte.gz -o ./web/resources/mnist/t10k-images-idx3-ubyte.gz
curl http://yann.lecun.com/exdb/mnist/t10k-labels-idx1-ubyte.gz -o ./web/resources/mnist/t10k-labels-idx1-ubyte.gz
curl http://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz -o ./web/resources/mnist/train-images-idx3-ubyte.gz
curl http://yann.lecun.com/exdb/mnist/train-labels-idx1-ubyte.gz -o./web/resources/mnist/train-labels-idx1-ubyte.gz
gzip -d web/resources/mnist/*

Install python packages:

pip install flask
pip install numpy
pip install scipy

Install npm packages:

npm install

Run:

# Train classifier
python -m web.lib.nn_predictor

# Run app
python run.py

Deploy to Heroku

heroku create
heroku buildpacks:add heroku/nodejs
heroku buildpacks:add https://github.com/kennethreitz/conda-buildpack.git
git push heroku master