Draft a Product Requirements Document (PRD) for a new 'AI-Powered Personal Shopper' feature for an e-commerce platform. The document must include: 1) Problem statement and success metrics, 2) Functional requirements including data inputs and model outputs, 3) Non-functional requirements (API latency < 200ms), 4) A specific section on AI Ethics covering bias mitigation in recommendations and GDPR compliance regarding user data usage for model training.