Explore a comprehensive conference talk on machine learning applications at Amazon, delivered by Rajeev Rastogi. Dive into various ML use cases including address quality improvement, product packaging optimization, substitute recommendations, demand forecasting, and product classification. Learn about key challenges in developing question-answering bots for product pages and techniques for learning semantically rich representations. Examine approaches to detect and correct product catalog defects, and understand the size recommendation problem using Bayesian modeling. Gain insights into leveraging customer and product features, incorporating customer personas, and the benefits of Bayesian inference in e-commerce applications.