How to Organize Data Labeling for Machine Learning: Approaches and Tools

If there was a data science hall of fame, it would have a section dedicated to labeling. The labelers' monument could be Atlas holding that large rock symbolizing their arduous, detail-laden responsibilities. ImageNet -- an image database -- would deserve its own stele. Just thinking about it makes you tired. While labeling is not launching a rocket into space, it's still seriously business.