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Optimal Mass Transport (OMT) distance

aditiiyer edited this page Aug 10, 2021 · 4 revisions

Formulation

Wasserstein distance is a metric for distributions derived from optimal mass transport. The formulation of OMT due to Monge and Kantorovich [3,4] may be expressed as follows: where denotes the set of all the couplings between and (joint distributions whose two marginal distributions are and ; is the cost of moving unit mass from x to y. The optimal gives a transport plan from to . And the optimal value of the object function is called Wasserstein distance.

Application

Compare dose distributions

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Example

See Jupyter notebook demonstrating OMT distance between two dose distributions, computed using CERRx.

References

  1. Jean-David Benamou and Yann Brenier. A computational fluid mechanics solution to the Monge-Kantorovich mass transfer problem. Numerische Mathematik, 84(3):375{393, 2000.
  2. Lenaic Chizat, Gabriel Peyre, Bernhard Schmitzer, and Francois-Xavier Vialard. An interpolating distance between optimal transport and Fisher-Rao metrics. Foundations of Computational Mathematics, 10:1{44, 2016.
  3. Cedric Villani. Topics in Optimal Transportation. American Mathematical Soc., 2003.
  4. Cedric Villani. Optimal Transport: Old and New, volume 338. Springer Science & Business Media, 2008.
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