Visualising high-dimensional datasets using PCA and t-SNE in Python

Updated some of the code to not use ggplot but instead use seaborn and matplotlib. I also added an example for a 3d-plot. I also changed the syntax to work with Python3. The first step around any data related challenge is to start by exploring the data itself. This could be by looking at, for example, the distributions of certain variables or looking at potential correlations between variables.