Day 2
Introduction to machine learning
   Author: Léo Blondel
   Slides: https://ai-ecol.github.io/chapters/day2_1_intro_machine_learning.pdf
Overfitting
   Author: Paul Tresson
   Slides: https://ai-ecol.github.io/chapters/day2_2_overfitting.pdf
Decision trees and random forest
   Author: Paul Tresson
   Slides: <ai-ecol.github.io/chapters/day2_3_random_forest.pdf>