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0.2.0

  • The reason for the less than ideal numerical properties of the exact dual solution for the Hessian with cross_good_congestion = true in v0.1.9 was that the sparse hessian had too few elements. This release fixes the problem by adding some additional off-diagonal elements to the sparse hesssian. The heuristic algorithm is now removed as the exact one always gives better solves (duality = true and duality = 2 both call the exact algorithm now).

0.1.9

  • The exact dual solution for the Hessian with cross_good_congestion = true does not have good numerical properties in some cases. Therefore, by default now an approximate solution is used which works better for most problems. Users can set duality = 2 to use the exact solution in the CGC case.

0.1.8

  • Fixed dual solution with cross_good_congestion = true, and set the default duality = true in init_parameters(). It is highly recommended to keep beta <= 1 in fixed labor cases to harness the dual solutions, which yield a tremendous speedup.

0.1.7

  • If duality = true, in init_parameters() (and labor_mobility = false - no dual solutions available for mobile labor cases), a new direct dual implementation of the model is used (with hard-coded sparse hessians passed directly to Ipopt) which is significantly faster than any other means of solving the model (10x speedup). However, with cross_good_congestion = true, the dual solution may be inaccurate. This may be fixed in the future.

0.1.6

Breaking Changes

  • All spatial parameters, including Lj, Lr, Hj, hj, Zjn, omegaj, omegar, and region are now stored in the graph structure created by create_graph(). create_graph() therefore only returns the graph structure, instead of both the (updated) parameters and the graph. Converesely, init_parameters() only contains parameters that are independent of the particular geography defined by create_graph().

Improvements

  • Minor improvements to Simulated Annealing.
  • Better spline options for plotting frictions surface (geography).
  • More faithful translation of apply_geography().

0.1.5

  • Removed the MATLAB toolbox and corresponding documentation (PDF files) from the repo to decrease size. A new repo was created for the MATLAB toolbox at SebKrantz/OptimalTransportNetworkToolbox. This repo and especially the docs folder continue to be very useful for Julia users, but are no longer part of the Julia library.