Restore the Creation model position in experiment

src/Platform/Experiment.cc

@@ -168,8 +168,8 @@ namespace platform {
                 fold = new StratifiedKFold(nfolds, y, seed);
             else
                 fold = new KFold(nfolds, y.size(0), seed);
-            auto clf = Models::instance()->create(model);
             for (int nfold = 0; nfold < nfolds; nfold++) {
+                auto clf = Models::instance()->create(model);
                 setModelVersion(clf->getVersion());
                 if (hyperparameters.size() != 0) {
                     clf->setHyperparameters(hyperparameters);
@@ -212,7 +212,6 @@ namespace platform {
                 result.addTimeTest(test_time[item].item<double>());
                 item++;
             }
-            clf.reset();
             if (!quiet)
                 std::cout << "end. " << flush;
             delete fold;