fix pynative sync error

mindspore/ccsrc/device/ascend/ascend_device_address.cc

@@ -96,6 +96,10 @@ void AscendDeviceAddress::SyncStream() const {
   MS_LOG(INFO) << "Start!";
   auto ms_context = MsContext::GetInstance();
   MS_EXCEPTION_IF_NULL(ms_context);
+  if (ms_context->execution_mode() != kPynativeMode) {
+    MS_LOG(INFO) << "Finish!";
+    return;
+  }
   auto device_id = ms_context->device_id();
   auto runtime_instance = device::KernelRuntimeManager::Instance().GetKernelRuntime(kAscendDevice, device_id);
   MS_EXCEPTION_IF_NULL(runtime_instance);
@@ -110,11 +114,7 @@ bool AscendDeviceAddress::SyncDeviceToHost(const std::vector<int> &shape, size_t
                                            void *host_ptr) const {
   MS_LOG(INFO) << "SyncDeviceToHost, Device(format:" << format_ << ", type_id:" << TypeIdLabel(type_id_)
                << ", size:" << size_ << "), Host(type_id:" << TypeIdLabel(type) << ", size:" << size << ")";
-  auto ms_context = MsContext::GetInstance();
-  MS_EXCEPTION_IF_NULL(ms_context);
-  if (ms_context->execution_mode() == kPynativeMode) {
-    SyncStream();
-  }
+  SyncStream();
   bool sync_ok = false;
   std::vector<size_t> host_shape;
   (void)std::transform(shape.begin(), shape.end(), std::back_inserter(host_shape), IntToSize);
@@ -205,6 +205,7 @@ bool AscendDeviceAddress::SyncHostToDevice(const std::vector<int> &shape, size_t
                                            const void *host_ptr) const {
   MS_LOG(INFO) << "SyncHostToDevice, Device(format:" << format_ << ", type_id:" << TypeIdLabel(type_id_)
                << ", size:" << size_ << "), Host(type_id:" << TypeIdLabel(type) << ", size:" << size << ")";
+  SyncStream();
   bool sync_ok = false;
   std::vector<size_t> host_shape;
   (void)std::transform(shape.begin(), shape.end(), std::back_inserter(host_shape), IntToSize);