UMAP Algorithm: Code for a university presentation

The presentation:

Methodology:

Launch UMAP in Python:

#You need to install the library umap-learn

import numpy as np
from sklearn.datasets import load_digits
import matplotlib.pyplot as plt
import umap.umap_ as umap

digits = load_digits()
data = digits.data

reducer = umap.UMAP(min_dist=0.1, n_components=2, n_neighbors=15, verbose=True)
reducer.fit(digits.data)

embedding = reducer.transform(digits.data)
# Verify that the result of calling transform is
# identical to accessing the embedding_ attribute
assert(np.all(embedding == reducer.embedding_))
embedding.shape

plt.scatter(embedding[:, 0], embedding[:, 1], c=digits.target, cmap='Spectral', s=5)
plt.gca().set_aspect('equal', 'datalim')
plt.colorbar(boundaries=np.arange(11)-0.5).set_ticks(np.arange(10))
plt.title('UMAP projection of the Digits dataset', fontsize=24);

Launch UMAP in R:

library(umap)
iris.umap = umap(MNIST.data)
plot.iris(MNIST.umap, MNIST.labels)

Structure of the repository:

• CSVs : UMAP results computed using the python script on the MNIST Dataset
• Executabes : Ready to launch UMAP animations, simply download the zip corresponding to your operating system to test the program
• Python : Python scripts to understand/Launch UMAP and to generate results
  • Notebooks : Python scripts in jupyter Notebook for simplicty
  • UMAP.py : UMAP python script coded from scratch, used to generate the results
• UMAP_Animation : Unity code to animate UMAP results on the MNIST dataset

How to test the animations quickly:

Simply download the zip files in the executables folder corresponding to your operating system and launch them. MAC OSX : Don't forget to add the executable as trustworthy to be able to launch it. To do so, hold ctrl while clicking on the executable and click open.