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Read me

This repository contains the simulation code for the paper

Paul Gölz and Ariel D. Procaccia: Migration as Submodular Optimization. 2018.

The paper is freely available at http://procaccia.info/papers/migration.pdf.

Requirements

  • Python 3.6 (higher versions might work, but so far are not supported by Gurobi)
  • Gurobi with gurobipy python bindings (we used version 8.0.1)
  • Igraph (0.7.1)
  • Seaborn (0.9.0)
  • Pandas (0.23.4)
  • Jupyter (4.4.0)

For academic use, Gurobi provides free licenses at http://www.gurobi.com/academia/for-universities.

At the time of this writing, the installation manual for igraph on OSX is out of date. We had to directly install brew install igraph, then pip install python-igraph. Should you see the warning

DeprecationWarning: To avoid name collision with the igraph project, this visualization library has been renamed to 'jgraph'. Please upgrade when convenient.

when importing igraph, then the following StackOverflow answer might help: https://stackoverflow.com/a/36203972.

Replication of experiments in the paper

The individual experiments are provided as Jupyter/IPython notebooks. If you just want to read them, the easiest way is to go to the corresponding page on Github, e.g., https://github.com/pgoelz/migration/blob/master/job_availability.ipynb, where they can be viewed in a browser. If you want to replicate our results or experiment with different parameter settings, you need to install the dependencies mentioned above. Then, running, say, jupyter notebook num_localities.ipynb opens a browser window, in which you can see our simulation results and easily rerun them.

While we fix the random seed to 0 in all our experiments, your simulations might produce slightly different results due to different library versions being used, non-determinism in these libraries or Python implementation details such as the iteration order over dictionaries. For what it is worth, we ran our simulations on a MacBook Pro (2017) with a 3.1 GHz Intel Core Duo i5 processor, with 16 GB of RAM, and running MacOS 10.12.6.

Questions

For questions on the simulations, please contact Paul Gölz.

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Simulation code for the paper “Migration as Submodular Optimization” by Paul Gölz and Ariel D. Procaccia.

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