[mlpack] 54/149: Make the Mahalanobis distance a true metric by default.

[Barak A. Pearlmutter]

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bap pushed a commit to branch svn-trunk
in repository mlpack.

commit 0ae549eba49050a8d47491a6a2e5f53c590c8920
Author: rcurtin <rcurtin at 9d5b8971-822b-0410-80eb-d18c1038ef23>
Date:   Fri Oct 31 20:59:56 2014 +0000

    Make the Mahalanobis distance a true metric by default.
    
    
    git-svn-id: http://svn.cc.gatech.edu/fastlab/mlpack/trunk@17274 9d5b8971-822b-0410-80eb-d18c1038ef23
---
 src/mlpack/core/metrics/mahalanobis_distance.hpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mlpack/core/metrics/mahalanobis_distance.hpp b/src/mlpack/core/metrics/mahalanobis_distance.hpp
index 99b4249..23518dd 100644
--- a/src/mlpack/core/metrics/mahalanobis_distance.hpp
+++ b/src/mlpack/core/metrics/mahalanobis_distance.hpp
@@ -40,9 +40,11 @@ namespace metric {
  * which is faster to evaluate.
  *
  * @tparam TakeRoot If true, takes the root of the output.  It is slightly
- *   faster to leave this at the default of false.
+ *   faster to leave this at the default of false, but this means the metric may
+ *   not satisfy the triangle inequality and may not be usable for methods that
+ *   expect a true metric.
  */
-template<bool TakeRoot = false>
+template<bool TakeRoot = true>
 class MahalanobisDistance
 {
  public:

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