How Google's Smart Compose for Gmail works – and did it fake its robo-caller demo?

Plus: Classifying frogs can be hopping mad

Roundup Hello, here's our weekly AI roundup. We have more information on how Google's sentence prediction in Smart Compose for Gmail works, as well as some questions about its Duplex robo-caller system. Also, decision trees to classify the mating calls of frogs and toads to study climate change."