How to compute Wasserstein distance?
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I have two probability distributions in arrays P and Q (normalized by area, of same length, and over same sample space). I want to find Wasserstein distance between them.
I tried to use the Earth Mover Distance from here:
My input was [Y, fval] = emd(X, X, P, Q, @gdf)
where X is the sample space. But it is giving output:
No feasible solution found.
Linprog stopped because no point satisfies the constraints.
Is this the way to compute Wasserstein distance? How do I fix this?
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답변 (1개)
Koorosh Aslansefat
2020년 4월 29일
편집: Koorosh Aslansefat
2020년 4월 29일
I have recently added new set of functions for ECDF-based distance measure to MATLAB Exchange.
I would suggest to have a look.
댓글 수: 3
Koorosh Aslansefat
2020년 5월 13일
If P and Q can be considered as empirical distribution function (ECDF), then you can use those functions with a bit of modification.
Georgios Pyrgiotakis
2020년 5월 14일
편집: Georgios Pyrgiotakis
2020년 5월 14일
Yes P and Q are emprical CDF. How can I use these functions? I tried but I get lost. It seems that you start with the data set convert it to CDF and then calculate the area between the two curves?
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