From 91a7a5f2e233793c428b74b7c4bd7958a08c4461 Mon Sep 17 00:00:00 2001
From: tqchen <tianqi.tchen@gmail.com>
Date: Fri, 10 Apr 2015 10:55:42 -0700
Subject: [PATCH] add small boundary checking

---
 src/tree/updater_colmaker-inl.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/tree/updater_colmaker-inl.hpp b/src/tree/updater_colmaker-inl.hpp
index 98139b5f7..63cdf80ba 100644
--- a/src/tree/updater_colmaker-inl.hpp
+++ b/src/tree/updater_colmaker-inl.hpp
@@ -498,6 +498,9 @@ class ColMaker: public IUpdater {
       #pragma omp parallel for schedule(static)
       for (bst_omp_uint i = 0; i < ndata; ++i) {
         const bst_uint ridx = rowset[i];
+        if (ridx >= position.size()) {
+          utils::Printf("ridx exceed bound\n");
+        }
         const int nid = this->DecodePosition(ridx);
         if (tree[nid].is_leaf()) {
           // mark finish when it is not a fresh leaf