message: Use CPU scope when normalizing any negative indices in the reduction_axes.
diff: @@ -860,7 +860,7 @@ Status ProdGrad(const Scope& scope, const Operation& op,
  // Normalize any negative indices in the reduction_axes to positive values.
  - auto reduction_indices_pos = Mod(scope, Add(scope, reduction_indices, rank), rank);
  + auto reduction_indices_pos = Mod(cpu_scope, Add(cpu_scope, reduction_indices, rank), rank);
  // [1]
  auto reduced = Cast(cpu_scope, reduction_indices_pos, DataType::DT_INT32);
  