More elaborate examples

[milost]

It would be nice to see a more detailed example.
The README says:

N, M, xs, ys = load_data('path to data')

But how exactly do these parameters look like? Something like:

N = 12 
M = 20
xs = [(s1, o1, p1), (s2, o2, p2), ...]
ys = [1, -1, ...]

...with concrete examples would be nice