chg fmap format

regression/xgboost_reg.h

@@ -166,6 +166,7 @@ namespace xgboost{
                     buffer_offset += static_cast<int>(evals_[i]->Size());
                 }
                 fprintf(fo, "\n");
+                fflush(fo);
             }
             /*! \brief get prediction, without buffering */
             inline void Predict(std::vector<float> &preds, const DMatrix &data){

regression/xgboost_reg_main.cpp

@@ -156,7 +156,7 @@ namespace xgboost{
                     elapsed = (unsigned long)(time(NULL) - start);
                 }
                 // always save final round
-                if (save_period == 0 || num_round % save_period != 0){
+                if ((save_period == 0 || num_round % save_period != 0) && model_out != "NONE"){                    
                     if (model_out == "NULL"){
                         this->SaveModel(num_round - 1);
                     }