How to play Quidditch using the TensorFlow Object Detection API

Deep Learning never ceases to amaze me. It has had a profound impact on several domains, beating benchmarks left and right. Image classification using convolutional neural networks (CNNs) is fairly easy today, especially with the advent of powerful front-end wrappers such as Keras with a TensorFlow back-end. But what if you want to identify more than one object in an image? This problem is called "object localization and detection."