Human-directed machine learning has emerged as the dominant process for the creation of Weak AI such as language translation, computer vision, search, drug discovery and logistics management. Increasingly, it appears Strong AI , aka AGI or "human-level" AI, will be achieved by bootstrapping machine learning at scale, which will require billions of humans in-the-loop How does human-in the-loop machine learning work? The process of training a neural net to do something useful, say the ability to confidently determine whether a photo has been taken indoors or outside, requires feeding it input content, in this case thousands of different photographs, allowing…