Abstract: One of the key bottlenecks in building machine learning systems is creating and managing the massive training datasets that today’s models learn from. In this talk, we will describe our work at Snorkel AI on labeling training data efficiently using our system, Snorkel, which allows users to programmatically label training data. Snorkel has been deployed by major technology companies like Google, Facebook and Intel, academic labs, and government agencies. Rather than hand-labeling training data, users write labeling functions which label data using heuristic strategies such as pattern matching, distant supervision, and other models. These labeling functions can have noisy, conflicting, and correlated outputs, which Snorkel models and combines into clean training labels. This allows training sets to be built in hours or days, rather than months or years.