rename the model for dumping

source/sample/transformer/T2TTrainer.cpp

@@ -403,8 +403,8 @@ void T2TTrainer::MakeCheckpoint(T2TModel * model, const char * validFN, const ch
 {
     char * fn = new char[MAX_LINE_LENGTH];
     char * fn2 = new char[MAX_LINE_LENGTH];
-    sprintf(fn, "%s.%s.%3d", modelFN, label, id);
-    sprintf(fn2, "%s.%s.%3d.output", modelFN, label, id);
+    sprintf(fn, "%s.%s.%03d", modelFN, label, id);
+    sprintf(fn2, "%s.%s.%03d.output", modelFN, label, id);
 
     //model->Dump(fn);
     if(validFN != NULL){