VehicleRoutingProblem

''' Class containing the data samples organized as follows:
    {p_i, v_i, y_i}_{i \in [N]}

    where p_i are the samples associated to passengers:

    p_i = <pOL^j, pOT^j, pDL^j, pDT^j>_{j \in R}
    where
        - pOL^j = Origin Latitude of request j
        - pOT^j = Origin Longitude of request j
        - pDL^j = Destination Latitude of request j
        - pDT^j = Destination Longitude of request j
        R = set of requests

    v_i = <vOL^j, vOT^j>_{j \in V}
    where
        - vOL^j = Origin Latitude of vehicle j
        - vOT^j = Origin Longitude of vehicle j
        V = set of vehicles

    y_i \in {0,1}^{|R| x |V|}
        is a 0-1 matrix whose entry:

        y_i[j,k] = 1 <->  request j is associated to vehicle k
'''