add remove tree

booster/xgboost_gbmbase.h

@@ -232,6 +232,16 @@ namespace xgboost{
                 }
                 return psum;
             }
+            /*! \brief delete the specified booster */
+            inline void DelteBooster( void ){
+                const int bid = tparam.reupdate_booster;
+                utils::Assert( bid >= 0 && bid < mparam.num_boosters , "must specify booster index for deletion"); 
+                delete boosters[ bid ];
+                for( int i = bid + 1; i < mparam.num_boosters; ++ i ){
+                    boosters[ i - 1 ] = boosters[ i ];
+                } 
+                boosters.resize( mparam.num_boosters -= 1 );
+            }
             /*! \brief update the prediction buffer, after booster have been updated */            
             inline void InteractRePredict( const FMatrixS &feats, bst_uint row_index, int buffer_index = -1, unsigned root_index = 0 ){
                 if( tparam.reupdate_booster != -1 ){