From the download page: > The AVA dataset contains 192 videos split into 154 training and 38 test videos. Each video has 15 minutes annotated in 3 second inter

From the download page: > The AVA dataset contains 192 videos split into 154 training and 38 test videos. Each video has 15 minutes annotated in 3 second intervals, resulting in 300 annotated segments. So basically this is a couple of CSV files annotating 192 videos, which are hosted on YouTube. ava_train_v1.0.csv is about 7 MB.