Sounded like the label for training is the user's action (whether they chose the...

jd20 on April 7, 2017 | parent | context | favorite | on: Machine learning without centralized training data

Sounded like the label for training is the user's action (whether they chose the suggestion provided or not). Then they collect the model updates in bulk from millions of users, that's far more useful for training purposes than a small very well curated data set.