message: fix: change the function return from Tindex to void
diff: @@ -48,7 +48,7 @@ struct ApplyAdadelta {
  template <typename Device, typename T, typename Tindex>
  struct ResourceSparseApplyAdadelta {
  - Tindex operator()(const Device& d, typename TTypes<T>::Matrix var,
  + void operator()(const Device& d, typename TTypes<T>::Matrix var,
  typename TTypes<T>::Matrix accum,
  typename TTypes<T>::Matrix accum_update,
  typename TTypes<T>::ConstScalar lr,
  