AttrValue device_ordinal_value;
  device_ordinal_value.set_placeholder("_device_ordinal");
  send_from_host_builder.Attr("device_ordinal", device_ordinal_value);
  send_from_host_builder.Attr(
      "key", absl::StrCat("host_compute_channel_", oc_cluster_name));
  send_from_host_builder.Attr(kXlaHasHostTransferAttrName, true);
  std::vector<NodeDefBuilder::NodeOut> inputs(send_from_host_dtypes.size());
  for (auto* n : ret_nodes) {
    int index;