Linear Algebra

First 50 numpy exercises This is a set of exercises collected by Rougier. All credits to Rougier for curating this list. I am simply trying to solve it for practice and hoping it serves as a reference for others. I am surprised I didn’t come across it before. View this post in a Jupyter Notebook This is intended to serve as a stepping stone to becoming a better Data Scientist / Machine Learning Researcher....

Demystifying the mathematics behind PCA We all know PCA and we all love PCA. Our friend that helps us deal with the curse of dimensionality. All data scientists have probably used PCA. I thought I knew PCA. Until I was asked to explain the mathematics behind PCA in an interview and all I could murmur was that it somehow maximizes the variance of the new features. The interviewer was even kind enough to throw me a hint about projections....