The document provides an overview of the artificial intelligence (AI) sector, highlighting significant growth in funding and activity in Q4 2017, with a total of $3.3 billion raised across various AI categories. It notes that the machine learning applications category leads in funding and growth, while early-stage funding made up 62% of the total funding events in the quarter. Additionally, the document tracks 2,029 AI startups accumulating $27 billion in funding as of December 2017.