message: Release python interpreter lock in TFE_TensorHandleToNumpy, since this method may be blocked.
diff: @@ -84,7 +84,10 @@ PyObject* TFE_TensorHandleToNumpy(TFE_TensorHandle* handle, TF_Status* status) {
  return nullptr;
  }
  - auto tensor = tensorflow::make_safe(TFE_TensorHandleResolve(handle, status));
  + tensorflow::Safe_TF_TensorPtr tensor = nullptr;
  + Py_BEGIN_ALLOW_THREADS;
  + tensor = tensorflow::make_safe(TFE_TensorHandleResolve(handle, status));
  + Py_END_ALLOW_THREADS;
  if (TF_GetCode(status) != TF_OK) {
  return nullptr;
  }
  