Google has unveiled Google Attribution, a tool that uses machine learning to measure the effectiveness of online marketing campaigns across a variety of devices and channels. Part of a series of new measurement tools introduced at Google Marketing Next, Google Attribution aims to help marketers determine what is driving consumers to make their online purchasing decisions. Google is at an "inflection point," noted Sridhar Ramaswamy, SVP of ads and commerce, when it comes to the use of technology to measure online marketing effectiveness.