Change Sprintf back

6335889e · minqiyang · adfaf9a6 · 6335889e
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paddle/fluid/string/printf.h paddle/fluid/string/printf.h +1 -1

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--- a/paddle/fluid/string/printf.h
+++ b/paddle/fluid/string/printf.h
@@ -84,7 +84,7 @@ void Fprintf(std::ostream& out, const char* fmt, const Args&... args) {
 }
 template <typename... Args>
-std::string Sprintf(const char* fmt = "", const Args&... args) {
+std::string Sprintf(const char* fmt, const Args&... args) {
  std::ostringstream oss;
  Fprintf(oss, fmt, args...);
  return oss.str();