fix cpplint error of async_executor.h

test=develop

fix cpplint error of async_executor.h
test=develop
690be0bb · Tao Luo · ceci3 · 6e87843e · 690be0bb
隐藏空白更改
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paddle/fluid/framework/async_executor.h paddle/fluid/framework/async_executor.h +1 -0

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--- a/paddle/fluid/framework/async_executor.h
+++ b/paddle/fluid/framework/async_executor.h
@@ -20,6 +20,7 @@ limitations under the License. */
 #include <mutex>   // NOLINT
 #include <random>  // local_random_engine
 #include <set>
+#include <string>
 #include <thread>  // NOLINT
 #include <typeinfo>
 #include <vector>