Online display advertising is a multibillion-dollar industry. It comes in different formats including banner ads composed of text, images, flash, and rich media such as audio and video. Advertisers or their agencies place advertisements on a variety of websites, even mobile apps across the Internet, to reach potential customers and deliver an advertising message.
Display online advertising has served as one of the greatest examples for machine learning utilization. Obviously, advertisers as well as consumers ourselves, are keenly interested in well-targeted ads. The industry has heavily relied on the ability of machine learning models to predict the ad targeting effectiveness: how likely the audience in a certain age group will be interested in this product, customers with certain household income will purchase this product after seeing its ad, frequent sport...