function ==(e1::Edge, e2::Edge)
    return e1.edge[1] == e2.edge[1] && e1.edge[2] == e2.edge[2]
end

function ==(n1::Node, n2::Node)
    return false
end

function ==(n1::ComputeTaskNode, n2::ComputeTaskNode)
    return n1.id == n2.id
end

function ==(n1::DataTaskNode, n2::DataTaskNode)
    return n1.id == n2.id
end