Machine Learning for OpenCV 4 - Second Edition

Visualizing data from an external dataset

As a final test for this chapter, let's visualize some data from an external dataset, such as the digits dataset from scikit-learn.

Specifically, we will need three tools for visualization:

• scikit-learn for the actual data
• NumPy for data processing
• Matplotlib

So, let's start by importing all of these:

In [1]: import numpy as np...     from sklearn import datasets...     import matplotlib.pyplot as plt...     %matplotlib inline

The first step is to actually load the data:

In [2]: digits = datasets.load_digits()

If we remember correctly, digits is supposed to have two different fields: a data field containing the actual image data and a target field containing the image labels. Rather than trusting our memory, ...