Assigns every node in the input network to a layer. In addition to the requirements described in AssignLayers(), OptimalLinkLengthLayering ensures that nodes are set in layers to minimize the total weighted link length. Hence, OptimalLinkLengthLayering minimizes the sum (U.layer - V.layer) * LinkLengthWeight(L) over all links L = (U,V).

protected virtual void OptimalLinkLengthLayering()