Machine learning fundamentals (I): Cost functions and gradient descent

**This is part one of a series on machine learning fundamentals. ML fundamentals (II): Neural Networks can be found at https://towardsdatascience.com/machine-learning-fundamentals-ii-neural-networks-f1e7b2cb3eef**

In this post I’ll use a simple linear regression model to explain two machine learning (ML) fundamentals; (1) cost functions and; (2) gradient descent. The…