See the delve manual, chapter 3 for an elaboration of these terms. Task type indicates the types of tasks associated with the dataset. We distinguish R egression, C lassification and D ensity estimation task types depending on the prior information provided about the task's targets. It is possible for a dataset to have more than one kind of task type. Attrs indicate the total number of attributes in the dataset.
Cases is the total number of cases in the dataset.
Methods shows the number of learning methods in the Delve repostory which have been run on one or more prototasks in the dataset. Clicking on the number lists the methods. Clicking in the View Results column gives a summary plot of the performance of the different methods on the dataset. This type of plot condenses a lot of information into a single figure. Briefly, it shows the expected performance of each method as the height of the solid bar on each of the training set sizes of a prototask.