Replace #define ... with pragma once

src/main/Experiment.h

@@ -1,5 +1,5 @@
-#ifndef EXPERIMENT_H
-#define EXPERIMENT_H
+#pragma once
+
 #include <torch/torch.h>
 #include <nlohmann/json.hpp>
 #include <string>
@@ -42,5 +42,4 @@ namespace platform {
         int nfolds{ 0 };
         int max_name{ 7 }; // max length of dataset name for formatting (default 7)
     };
-}
-#endif
+}