diff options
author | Marc Glisse <marc.glisse@inria.fr> | 2020-06-01 15:24:28 +0200 |
---|---|---|
committer | Marc Glisse <marc.glisse@inria.fr> | 2020-06-01 15:24:28 +0200 |
commit | 4aff8dc700a0790373d82ae24076359c09ee04c8 (patch) | |
tree | 7769285a8f5706e883cf0f56aadaa68e06b68f91 /src/python/gudhi/hera/wasserstein.cc | |
parent | c53567c85f936f78000471fcee6234e75f7742ca (diff) |
Interface for hera's bottleneck_distance
Diffstat (limited to 'src/python/gudhi/hera/wasserstein.cc')
-rw-r--r-- | src/python/gudhi/hera/wasserstein.cc | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/python/gudhi/hera/wasserstein.cc b/src/python/gudhi/hera/wasserstein.cc new file mode 100644 index 00000000..1a21f02f --- /dev/null +++ b/src/python/gudhi/hera/wasserstein.cc @@ -0,0 +1,56 @@ +/* This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT. + * See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details. + * Author(s): Marc Glisse + * + * Copyright (C) 2020 Inria + * + * Modification(s): + * - YYYY/MM Author: Description of the modification + */ + +#include <wasserstein.h> // Hera + +#include <pybind11_diagram_utils.h> + +double wasserstein_distance( + Dgm d1, Dgm d2, + double wasserstein_power, double internal_p, + double delta) +{ + // I *think* the call to request() has to be before releasing the GIL. + auto diag1 = numpy_to_range_of_pairs(d1); + auto diag2 = numpy_to_range_of_pairs(d2); + + py::gil_scoped_release release; + + hera::AuctionParams<double> params; + params.wasserstein_power = wasserstein_power; + // hera encodes infinity as -1... + if(std::isinf(internal_p)) internal_p = hera::get_infinity<double>(); + params.internal_p = internal_p; + params.delta = delta; + // The extra parameters are purposedly not exposed for now. + return hera::wasserstein_dist(diag1, diag2, params); +} + +PYBIND11_MODULE(wasserstein, m) { + m.def("wasserstein_distance", &wasserstein_distance, + py::arg("X"), py::arg("Y"), + py::arg("order") = 1, + py::arg("internal_p") = std::numeric_limits<double>::infinity(), + py::arg("delta") = .01, + R"pbdoc( + Compute the Wasserstein distance between two diagrams. + Points at infinity are supported. + + Parameters: + X (n x 2 numpy array): First diagram + Y (n x 2 numpy array): Second diagram + order (float): Wasserstein exponent W_q + internal_p (float): Internal Minkowski norm L^p in R^2 + delta (float): Relative error 1+delta + + Returns: + float: Approximate Wasserstein distance W_q(X,Y) + )pbdoc"); +} |