TF_NewOperation(function_graph, "Placeholder", "arg");
  TF_SetAttrType(arg_descr, "dtype", TF_INT32);
  TF_Status* status = TF_NewStatus();
  TF_Operation* arg = TF_FinishOperation(arg_descr, status);
  ASSERT_TRUE(TF_GetCode(status) == TF_OK) << TF_Message(status);
  TF_OperationDescription* id_descr =
      TF_NewOperation(function_graph, "Identity", "id");
  TF_SetAttrType(id_descr, "T", TF_INT32);
  TF_AddInput(id_descr, {arg, 0});

  TF_SetAttrType(placeholder_desc, "dtype", TF_FLOAT);
  TF_Operation* placeholder_op = TF_FinishOperation(placeholder_desc, status);
  if (TF_GetCode(status) != TF_OK) return;
  TF_Output x{placeholder_op, 0};

  TF_OperationDescription* reduce_desc =
      TF_NewOperation(body.get(), "CollectiveReduce", "CollectiveReduce");
  TF_SetAttrType(reduce_desc, "T", TF_FLOAT);

  for (int i = 0; i < num_values; ++i) {
    b[i] = values[i];
  }
  desc->node_builder.Attr(attr_name,
                          ArraySlice<const bool>(b.get(), num_values));
}

void TF_SetAttrType(TF_OperationDescription* desc, const char* attr_name,
                    TF_DataType value) {
  desc->node_builder.Attr(attr_name, static_cast<DataType>(value));
}

    TF_OperationDescription* desc = TF_NewOperation(graph, "Const", name);
    TF_SetAttrTensor(desc, "value", tensor.get(), s);
    if (TF_GetCode(s) != TF_OK) return nullptr;
    TF_SetAttrType(desc, "dtype", TF_FLOAT);
    TF_Operation* op = TF_FinishOperation(desc, s);
    EXPECT_EQ(TF_OK, TF_GetCode(s)) << TF_Message(s);
    return op;
  }

                                              const unsigned char* values,
                                              int num_values);
TF_CAPI_EXPORT extern void TF_SetAttrType(TF_OperationDescription* desc,
                                          const char* attr_name,
                                          TF_DataType value);

                        const char* attr_name, const char* attr_value,
                        TF_Operation** op) {
  TF_OperationDescription* desc = TF_NewOperation(graph, "Placeholder", name);
  TF_SetAttrType(desc, "dtype", TF_INT32);
  TF_SetAttrString(desc, attr_name, attr_value, strlen(attr_value));
  *op = TF_FinishOperation(desc, s);
  ASSERT_EQ(TF_OK, TF_GetCode(s)) << TF_Message(s);
  ASSERT_NE(*op, nullptr);