%group_key: tensor<i32>,
  %group_size: tensor<i32>,
  %instance_key: tensor<i32>) {
  tf_executor.graph {
    // expected-remark@above {{ID: 5}}
    %island = tf_executor.island {
        // expected-remark@above {{ID: 3}}
        // expected-remark@above {{Successors: {4}}}

// For `CollectiveReduceV2Op` we have 3 cases:
// 1) `is_stateless` is true turns off automatic ordering and we purely rely on
//    instance_key to distinguish collective groups. In this case, ordering
//    tokens are irrelevant. Each collective group should have a unique
//    instance_key at runtime.
// 2) If at least one ordering token is present, then we purely rely on ordering