if (!devices_compatible) {
    return LogNotContractableAndReturnFalse(
        from, to, "the two nodes have incompatible devices");
  }

  if (from->xla_scope().has_value() && to->xla_scope().has_value() &&
      *from->xla_scope() != *to->xla_scope()) {
    return LogNotContractableAndReturnFalse(
        from, to, "the two nodes have mismatching XLA scopes");
  }