The document discusses metrics for measuring artificial intelligence research and development, noting that AI research can be structured into 7 clusters and that globally AI research output has grown significantly each year across these clusters. It also outlines using machine learning techniques to define and structure the AI field by training a classifier to distinguish AI papers and using keyword co-occurrence to organize the different areas of research. The main data source discussed for quantitative analysis of AI research is Scopus, which contains over 70 million academic articles, authors and affiliations.