!754 remove redundant data copy

Merge pull request !754 from dinghao/fix_tensor

mindspore/ccsrc/ir/meta_tensor.cc

@@ -166,9 +166,6 @@ Tensor::Tensor(const py::int_ &input, const TypePtr &data_type) { init(py::array
 Tensor::Tensor(const Tensor &tensor, const TypePtr &data_type)
     : MetaTensor(tensor), dirty_(tensor.dirty_), device_address_(tensor.device_address_) {
   init(tensor.data_, data_type);
-  if (device_address_ != nullptr) {
-    (void)data_sync();
-  }
 }
 
 Tensor &Tensor::operator=(const Tensor &tensor) {