Release GIL lock when SyncAsNumpy and run bprop graph in PyNative mod.

mindspore/ccsrc/backend/session/executor.cc

@@ -428,7 +428,7 @@ void Executor::RunOpsInGraph(const SessionPtr &session, const GraphId &graph_id,
   task->session_ = session;
   task->graph_id_ = graph_id;
   task->input_tensors_ = inputs;
-  RunTask(task, true);
+  RunTask(task, true, true);
   *outputs = task->outputs_;
 }
 

mindspore/ccsrc/pybind_api/ir/tensor_py.cc

@@ -259,11 +259,13 @@ py::tuple TensorPy::GetPyTupleShape(const Tensor &tensor) {
 }
 
 py::array TensorPy::SyncAsNumpy(const Tensor &tensor) {
-  if (tensor.NeedWait()) {
+  {
     py::gil_scoped_release gil_release;
-    tensor.Wait();
+    if (tensor.NeedWait()) {
+      tensor.Wait();
+    }
+    tensor.data_sync();
   }
-  tensor.data_sync();
   return AsNumpy(tensor);
 }