Creates tensor in target device to avoid high CPU occupation. (#695)

anyvoice

2023-07-02 cf36ce977c0b8bd54c906e63ce31931ac060178f

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#include "yaml-cpp/null.h"
 
namespace YAML {
_Null Null;
 
bool IsNullString(const std::string& str) {
  return str.empty() || str == "~" || str == "null" || str == "Null" ||
         str == "NULL";
}
}