The document discusses how Puhui Finance, a Chinese P2P lending company, uses big data and AI techniques for risk control. It introduces their Feature Compute Engine, which converts unstructured user data into structured features, and their Knowledge Graph, which connects entities and analyzes relationships. Specific use cases discussed include anti-fraud detection using rules, contact recovery by building phone networks, and detecting high-risk individuals via search engines. Challenges around unstructured data, name disambiguation, reasoning and lack of training data are also covered.