From 468bc7725a133e598ec36bfeb92c2e34fec17b57 Mon Sep 17 00:00:00 2001
From: tqchen <tianqi.tchen@gmail.com>
Date: Tue, 19 Jan 2016 16:42:33 -0800
Subject: [PATCH] [METRIC] change metric accumulator to double

---
 src/metric/multiclass_metric.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/metric/multiclass_metric.cc b/src/metric/multiclass_metric.cc
index d51379c64..428554976 100644
--- a/src/metric/multiclass_metric.cc
+++ b/src/metric/multiclass_metric.cc
@@ -31,7 +31,7 @@ struct EvalMClassBase : public Metric {
         << "mlogloss and merror are only used for multi-class classification,"
         << " use logloss for binary classification";
     const bst_omp_uint ndata = static_cast<bst_omp_uint>(info.labels.size());
-    float sum = 0.0, wsum = 0.0;
+    double sum = 0.0, wsum = 0.0;
     int label_error = 0;
     #pragma omp parallel for reduction(+: sum, wsum) schedule(static)
     for (bst_omp_uint i = 0; i < ndata; ++i) {
@@ -50,7 +50,7 @@ struct EvalMClassBase : public Metric {
         << "MultiClassEvaluation: label must be in [0, num_class),"
         << " num_class=" << nclass << " but found " << label_error << " in label";
 
-    float dat[2]; dat[0] = sum, dat[1] = wsum;
+    double dat[2]; dat[0] = sum, dat[1] = wsum;
     if (distributed) {
       rabit::Allreduce<rabit::op::Sum>(dat, 2);
     }