Fix some simple build error on MacOS (pytorch#949)

Issue pytorch#948

Signed-off-by: Zhou Chang <[email protected]>

Author: Teaonly

torch/csrc/autograd/engine.cpp

@@ -22,6 +22,17 @@ using thpp::Tensor;
 
 namespace torch { namespace autograd {
 
+struct FunctionTask {
+  BackwardTask* base;
+  std::shared_ptr<Function> fn;
+  GradBuffer grad;
+
+  FunctionTask(BackwardTask* base, std::shared_ptr<Function> fn, GradBuffer grad)
+    : base(base)
+    , fn(fn)
+    , grad(std::move(grad)) {}
+};
+
 struct ReadyQueue {
   std::deque<FunctionTask> queue;
   std::condition_variable not_empty;
@@ -55,17 +66,6 @@ struct BackwardTask {
     , dependencies() {}
 };
 
-struct FunctionTask {
-  BackwardTask* base;
-  std::shared_ptr<Function> fn;
-  GradBuffer grad;
-
-  FunctionTask(BackwardTask* base, std::shared_ptr<Function> fn, GradBuffer grad)
-    : base(base)
-    , fn(fn)
-    , grad(std::move(grad)) {}
-};
-
 auto ReadyQueue::push_front(FunctionTask item) -> void {
   {
     std::lock_guard<std::mutex> lock(mutex);

torch/csrc/autograd/function.cpp

@@ -1,5 +1,6 @@
 #include "function.h"
 
+#include <string>
 #include <THPP/THPP.h>
 
 #include "variable.h"

torch/csrc/utils/tuple_parser.cpp

@@ -1,5 +1,7 @@
 #include "tuple_parser.h"
 
+#include <string>
+
 #include "torch/csrc/DynamicTypes.h"
 #include "torch/csrc/autograd/python_variable.h"
 #include "python_numbers.h"