The Data That Powers A.I. Is Disappearing Fast

For years, the people building powerful artificial intelligence systems have used enormous troves of text, images and videos pulled from the internet to train their models. Now, that data is drying up. Many of the most important web sources used for training A.I. models have restricted the use of their data, according to a study published this week by the Data Provenance Initiative, an M.I.T.-led research group. The study, which looked at 14,000 web domains that are included in three commonly used A.I. training data sets, discovered an “emerging crisis in consent,” as publishers and online platforms have taken steps to prevent their data from being harvested. The researchers estimate that in the three data sets—called C4, RefinedWeb and Dolma—5 percent of all data, and 25 percent of data from the highest-quality sources, has been restricted.