<p>This is the so-called Iris flower dataset, or Fisher's Iris dataset. Source: <a href="http://archive.ics.uci.edu/ml/datasets/Iris">UCI Machine Learning Repository</a>.</p> <p>The dataset is a multivariate data set introduced by the British statistician and biologist Ronald Fisher in his 1936 paper <em>The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis</em>, <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1469-1809.1936.tb02137.x">Annals of Eugenics</a>.</p> <p>For further details, see <a href="https://en.wikipedia.org/wiki/Iris_flower_data_set">Wikipedia</a>.</p>