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diff --git a/geom_matching/wasserstein/src/wasserstein.cpp b/geom_matching/wasserstein/src/wasserstein.cpp
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+++ b/geom_matching/wasserstein/src/wasserstein.cpp
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+/*
+ 
+Copyright (c) 2015, M. Kerber, D. Morozov, A. Nigmetov
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ 
+You are under no obligation whatsoever to provide any bug fixes, patches, or
+upgrades to the features, functionality or performance of the source code
+(Enhancements) to anyone; however, if you choose to make your Enhancements
+available either publicly, or directly to copyright holder,
+without imposing a separate written license agreement for such Enhancements,
+then you hereby grant the following license: a  non-exclusive, royalty-free
+perpetual license to install, use, modify, prepare derivative works, incorporate
+into other computer software, distribute, and sublicense such enhancements or
+derivative works thereof, in binary and source code form.
+
+  */
+
+#include <assert.h>
+#include <algorithm>
+#include <functional>
+#include <iterator>
+
+#include "def_debug.h"
+#include "wasserstein.h"
+
+#ifdef GAUSS_SEIDEL_AUCTION
+#include "auction_runner_gs.h"
+#else
+#include "auction_runner_jak.h"
+#endif
+
+namespace geom_ws {
+
+double wassersteinDistVec(const std::vector<DiagramPoint>& A, 
+                          const std::vector<DiagramPoint>& B, 
+                          const double q, 
+                          const double delta,
+                          const double _internal_p,
+                          const double _initialEpsilon,
+                          const double _epsFactor)
+{
+    if (q < 1) {
+        std::cerr << "Wasserstein distance not defined for q = " << q << ", must be >= 1" << std::endl;
+        throw "Bad q in Wasserstein";
+    }
+    if (delta < 0.0) {
+        std::cerr << "Relative error  " << delta << ", must be > 0" << std::endl;
+        throw "Bad delta in Wasserstein";
+    }
+    if (_initialEpsilon < 0.0) {
+        std::cerr << "Initial epsilon = " << _initialEpsilon << ", must be non-negative" << std::endl;
+        throw "Bad delta in Wasserstein";
+    }
+    if (_epsFactor < 0.0) {
+        std::cerr << "Epsilon factor = " << _epsFactor << ", must be non-negative" << std::endl;
+        throw "Bad delta in Wasserstein";
+    }
+#ifdef GAUSS_SEIDEL_AUCTION
+    AuctionRunnerGS auction(A, B, q,  delta, _internal_p, _initialEpsilon, _epsFactor);
+#else
+    AuctionRunnerJak auction(A, B, q,  delta, _internal_p);
+#endif
+    return auction.getWassersteinDistance();
+}
+
+bool readDiagramPointSet(const std::string& fname, std::vector<std::pair<double, double>>& result)
+{
+    return readDiagramPointSet(fname.c_str(), result);
+}
+
+bool readDiagramPointSet(const char* fname, std::vector<std::pair<double, double>>& result)
+{
+    size_t lineNumber { 0 };
+    result.clear();
+    std::ifstream f(fname);
+    if (!f.good()) {
+        std::cerr << "Cannot open file " << fname << std::endl;
+        return false;
+    }
+    std::string line;
+    while(std::getline(f, line)) {
+        lineNumber++;
+        // process comments: remove everything after hash
+        auto hashPos = line.find_first_of("#", 0);
+        if( std::string::npos != hashPos) {
+            line = std::string(line.begin(), line.begin() + hashPos);
+        }
+        if (line.empty()) {
+            continue;
+        }
+         // trim whitespaces 
+        auto whiteSpaceFront = std::find_if_not(line.begin(),line.end(),isspace);
+        auto whiteSpaceBack = std::find_if_not(line.rbegin(),line.rend(),isspace).base();
+        if (whiteSpaceBack <= whiteSpaceFront) {
+            // line consists of spaces only - move to the next line
+            continue;
+        }
+        line = std::string(whiteSpaceFront,whiteSpaceBack);
+        double x, y;
+        std::istringstream iss(line);
+        if (not(iss >> x >> y)) {
+            std::cerr << "Error in file " << fname << ", line number " << lineNumber << ": cannot parse \"" << line << "\"" << std::endl;
+            return false;
+        }
+        result.push_back(std::make_pair(x,y));
+    }
+    f.close();
+    return true;
+}
+
+} // end of namespace geom_ws