Building Machine Learning Systems with Python - Third Edition

Visualization is a good first step

Datasets later in the book will grow to thousands of features. With only four features in our starting example, we can easily plot all two-dimensional projections on a single page and build predictions, which can then be extended to large datasets with many more features. As we saw in Chapter 3, Regression, visualizations are excellent in the initial exploratory phase of the analysis as they allow you to learn the general features of your problem as well as catch problems that occurred with data collection early.

Each subplot in the following plot shows all points projected into two of the dimensions. The outlying group (triangles) are the Iris Setosa plants, while Iris Versicolor plants are in the center ...