[mlpack-git] master: Fix furthest neighbor sort policy. (41878d2)

[gitdub at mlpack.org]

Repository : https://github.com/mlpack/mlpack
On branch  : master
Link       : https://github.com/mlpack/mlpack/compare/31fe55d4c7d7cd6516b5d6c7d98ed93c5f0347fa...20f4eacd1b082d04d9aab1fc2f61ef3edaac3f33

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commit 41878d2171595c3acd682bad35cf4c105165d16d
Author: MarcosPividori <marcos.pividori at gmail.com>
Date:   Fri Aug 19 12:12:51 2016 -0300

    Fix furthest neighbor sort policy.


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41878d2171595c3acd682bad35cf4c105165d16d
 .../neighbor_search/sort_policies/furthest_neighbor_sort.hpp     | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/mlpack/methods/neighbor_search/sort_policies/furthest_neighbor_sort.hpp b/src/mlpack/methods/neighbor_search/sort_policies/furthest_neighbor_sort.hpp
index 943bcc5..bb1cf11 100644
--- a/src/mlpack/methods/neighbor_search/sort_policies/furthest_neighbor_sort.hpp
+++ b/src/mlpack/methods/neighbor_search/sort_policies/furthest_neighbor_sort.hpp
@@ -152,7 +152,12 @@ class FurthestNeighborSort
    */
   static inline double ConvertToScore(const double distance)
   {
-    return DBL_MAX - distance;
+    if (distance == DBL_MAX)
+      return 0.0;
+    else if (distance == 0.0)
+      return DBL_MAX;
+    else
+      return (1.0 / distance);
   }
 
   /**
@@ -162,7 +167,7 @@ class FurthestNeighborSort
    */
   static inline double ConvertToDistance(const double score)
   {
-    return DBL_MAX - score;
+    return ConvertToScore(score);
   }
 };