  explicit CollectiveBcastSendV2OpKernel(OpKernelConstruction* c)
      : CollectiveOpV2Kernel(c) {
    const bool is_source = true;
    name_ = strings::StrCat(name(), ": Broadcast(", is_source, ")");
  }
  explicit CollectiveBcastSendV2OpKernel(OpKernelConstruction* c)
      : CollectiveOpV2Kernel(c) {
    const bool is_source = true;
    name_ = strings::StrCat(name(), ": Broadcast(", is_source, ")");
  }