It would be nice if you could DataLoader for one maximal-size batch, without knowing the size of the inputs.

This would mean that a function which loads some data, pre-processes it, and then returns a DataLoader could easily be used to return the full dataset, in the identical format, as long as it passes the keyword batchsize along.

Could be batchsize=0, since -1 already does something special. Although unfortunately 0 is not an error right now.