A similar version to leave-one-out CV is leave-P-out CV, which generates all possible combinations of p data rows, as shown in the following code:

lpo = LeavePOut(p=2)
for train, validate in lpo.split(data):
    print(train, validate)

[2 3 4 5 6 7 8 9] [0 1]
[1 3 4 5 6 7 8 9] [0 2]
...
[0 1 2 3 4 5 6 8] [7 9]
[0 1 2 3 4 5 6 7] [8 9]