From 7f6b96187423ba374b697f6f411c4a70d24ee297 Mon Sep 17 00:00:00 2001
From: Arnur Nigmetov <nigmetov@tugraz.at>
Date: Mon, 16 Sep 2019 17:26:42 +0200
Subject: Add traits for float in Wasserstein.

---
 geom_matching/wasserstein/example/wasserstein_dist.cpp | 17 +++++++++--------
 geom_matching/wasserstein/include/wasserstein.h        | 11 +++++++++++
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/geom_matching/wasserstein/example/wasserstein_dist.cpp b/geom_matching/wasserstein/example/wasserstein_dist.cpp
index 25e1f68..cbe83e2 100644
--- a/geom_matching/wasserstein/example/wasserstein_dist.cpp
+++ b/geom_matching/wasserstein/example/wasserstein_dist.cpp
@@ -40,15 +40,16 @@ derivative works thereof, in binary and source code form.
 
 #include "wasserstein.h"
 
-// any container of pairs of doubles can be used,
+// any container of pairs of Reals can be used,
 // we use vector in this example.
 
 int main(int argc, char* argv[])
 {
-    using PairVector = std::vector<std::pair<double, double>>;
+    using Real = double;
+    using PairVector = std::vector<std::pair<Real, Real>>;
     PairVector diagramA, diagramB;
 
-    hera::AuctionParams<double> params;
+    hera::AuctionParams<Real> params;
     params.max_num_phases = 800;
 
     opts::Options ops(argc, argv);
@@ -87,7 +88,7 @@ int main(int argc, char* argv[])
         std::cout << ops << std::endl;
     }
 
-    if (!hera::read_diagram_point_set<double, PairVector>(dgm_fname_1, diagramA)) {
+    if (!hera::read_diagram_point_set<Real, PairVector>(dgm_fname_1, diagramA)) {
         std::exit(1);
     }
 
@@ -101,7 +102,7 @@ int main(int argc, char* argv[])
     }
 
     if (params.wasserstein_power == 1.0) {
-        hera::remove_duplicates<double>(diagramA, diagramB);
+        hera::remove_duplicates<Real>(diagramA, diagramB);
     }
 
     //default relative error:  1%
@@ -112,11 +113,11 @@ int main(int argc, char* argv[])
 
     // default for internal metric is l_infinity
     if (std::isinf(params.internal_p)) {
-        params.internal_p = hera::get_infinity<double>();
+        params.internal_p = hera::get_infinity<Real>();
     }
 
 
-    if (not hera::is_p_valid_norm<double>(params.internal_p)) {
+    if (not hera::is_p_valid_norm<Real>(params.internal_p)) {
         std::cerr << "internal-p was \"" << params.internal_p << "\", must be a number >= 1.0 or inf. Cannot proceed. " << std::endl;
         std::exit(1);
     }
@@ -144,7 +145,7 @@ int main(int argc, char* argv[])
     spdlog::set_level(spdlog::level::info);
 #endif
 
-    double res = hera::wasserstein_dist(diagramA, diagramB, params, log_filename_prefix);
+    Real res = hera::wasserstein_dist(diagramA, diagramB, params, log_filename_prefix);
 
     std::cout << std::setprecision(15) << res << std::endl;
     if (print_relative_error)
diff --git a/geom_matching/wasserstein/include/wasserstein.h b/geom_matching/wasserstein/include/wasserstein.h
index 35d0bf6..17bb211 100644
--- a/geom_matching/wasserstein/include/wasserstein.h
+++ b/geom_matching/wasserstein/include/wasserstein.h
@@ -67,6 +67,17 @@ struct DiagramTraits<PairContainer_, std::pair<double, double>>
     static RealType get_y(const PointType& p)       { return p.second; }
 };
 
+template<class PairContainer_>
+struct DiagramTraits<PairContainer_, std::pair<float, float>>
+{
+    using PointType = std::pair<float, float>;
+    using RealType  = float;
+    using Container = std::vector<PointType>;
+
+    static RealType get_x(const PointType& p)       { return p.first; }
+    static RealType get_y(const PointType& p)       { return p.second; }
+};
+
 
 namespace ws
 {
-- 
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